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Comment on seismic electric signals (SES) and earthquakes: A review of an updated VAN method and competing hypotheses for SES generation and earthquake triggering by Daniel S. Helman, physics of earth and planetary interiors, 302 (2020) Phys. Earth Planet. Inter. (IF 2.237) Pub Date : 2021-02-25 Carlos A. Vargas; J. Sebastian Gomez; Juan J. Gomez; Juan M. Solano; Alexander Caneva
As a comment on Seismic Electric Signals (SES) and earthquakes: A review of an updated VAN method and competing hypotheses for SES generation and earthquake triggering, herein we present the analysis of time series gathered by three MT stations located in the Eastern Cordillera of Colombia, for evaluating the electric and magnetic fields during an interval of several days. Records allow estimating
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Magnetization of sinking porous diapirs in planetesimal cores Phys. Earth Planet. Inter. (IF 2.237) Pub Date : 2021-03-02 David Bercovici; Elvira Mulyukova
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Low frequency bulk modulus of partially molten peridotite, KLB-1 Phys. Earth Planet. Inter. (IF 2.237) Pub Date : 2021-02-27 Donald J. Weidner; Li Li
We report experimental results on the bulk modulus of partially molten peridotite at mantle conditions, using a multi-anvil high pressure apparatus coupled with synchrotron X-ray radiation. A sinusoidal pressure at an amplitude of 180 MPa with period of 360 s is applied to the sample as a function of temperature. The sample volume derived from the X-ray radiograph also demonstrated sinusoidal variation
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Thermal conductivities of solid and molten silicates: Implications for dynamos in mercury-like proto-planets Phys. Earth Planet. Inter. (IF 2.237) Pub Date : 2021-01-28 D. Freitas; J. Monteux; D. Andrault; G. Manthilake; A. Mathieu; F. Schiavi; N. Cluzel
Remanent magnetization and active magnetic fields have been detected for several telluric planetary bodies in the solar system (Earth, Mercury, Moon, Mars) suggesting the presence of core dynamos active at the early stages of the planet formation and variable lifetimes. Among the factors controlling the possibility of core dynamos generation, the dynamics of the surrounding silicate mantle and its
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A review of mechanisms generating seismic anisotropy in the upper mantle Phys. Earth Planet. Inter. (IF 2.237) Pub Date : 2021-02-25 Lars N. Hansen; Manuele Faccenda; Jessica M. Warren
Seismic anisotropy is a key observational tool for mapping flow in Earth's upper mantle. However, interpreting patterns of anisotropy relies on a firm understanding of the microphysical mechanisms that generate anisotropy. Here we discuss our current understanding of the generation of intrinsic and extrinsic seismic anisotropy in upper-mantle rocks. Intrinsic anisotropy results from the elastic anisotropy
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Seismicity along the Santorini-Amorgos zone and its relationship with active tectonics and fluid distribution Phys. Earth Planet. Inter. (IF 2.237) Pub Date : 2021-02-04 R. Andinisari; K.I. Konstantinou; P. Ranjan
The Santorini-Amorgos zone is located in the central part of the Hellenic volcanic arc and is hosting eight large faults as well as Kolumbo and Santorini volcanic centers. The largest earthquake (Mw ~ 7.1) in the southern Aegean during the 20th century also occurred in this area on 9 July 1956. A total of 1868 crustal events were recorded by temporary networks during September 2002 to July 2004 and
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A moment tensor inversion approach based on the correlation between defined functions and waveforms Phys. Earth Planet. Inter. (IF 2.237) Pub Date : 2021-02-09 Yue Kong; Min Li; Weimin Chen; Ning Liu; Boqi Kang
The moment tensor inversion is a commonly-used method to interpret source mechanisms of microseismicity. In the inversion for real data (e.g. microseismicity recorded during hydraulic fracturing), the waveforms recorded by sensors can be the mixtures of signals and noise, or the superposition of signals generated by multiple sources. Then the traditional approach may result in inaccurate solutions
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Characteristic periods of the paleosecular variation of the Earth's magnetic field during the Holocene from global paleoreconstructions Phys. Earth Planet. Inter. (IF 2.237) Pub Date : 2021-01-31 A. González-López; S.A. Campuzano; A. Molina-Cardín; F.J. Pavón-Carrasco; A. De Santis; M.L. Osete
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Structural control on the 2018 and 2019 Hualien earthquakes in Taiwan Phys. Earth Planet. Inter. (IF 2.237) Pub Date : 2021-02-10 Genti Toyokuni; Dapeng Zhao; Kate Huihsuan Chen
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Response of Fogo volcano (Cape Verde) to lunisolar gravitational forces during the 2014–2015 eruption Phys. Earth Planet. Inter. (IF 2.237) Pub Date : 2021-02-08 Stéphanie Dumont; Graça Silveira; Susana Custódio; Fernando Lopes; Jean-Louis Le Mouël; Mathieu Gouhier; Yannick Guéhenneux
Volcanoes are complex systems that evolve in space and time as a result of their eruptive activity. Volcanic eruptions represent the ultimate expression of a complex interplay between internal and external processes that span across different time scales. Deciphering how internal and external processes interact at the time scale of eruptions may provide key insights on the temporal evolution of eruptions
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Inference of thermodynamic state in the asthenosphere from anelastic properties, with applications to north American upper mantle Phys. Earth Planet. Inter. (IF 2.237) Pub Date : 2021-02-16 Christopher Havlin; Ben Holtzman; Emily Hopper
Inference of thermodynamic state and full-spectrum mechanical behavior of the lithosphere and asthenosphere is a central problem in geophysics, implicating our understanding of the convection patterns, transient responses and chemical composition of the planet. Anelasticity is responsible for significant relaxation of stress associated with seismic wave propagation in the asthenosphere, while irreversible
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Magma ascent and emplacement below floor fractured craters on the Moon from floor uplift and fracture length Phys. Earth Planet. Inter. (IF 2.237) Pub Date : 2021-02-05 D. Walwer; C. Michaut; V. Pinel; M. Adda-Bedia
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Novel approaches of magnetic inversion using seismic tomography in Taiwan area Phys. Earth Planet. Inter. (IF 2.237) Pub Date : 2021-02-04 Chieh-Hung Chen; Chun-Rong Chen; Shida Sun; Strong Wen; Jinsong Du; Cheng-Horng Lin; Yi Hsuan Huang; Peng Han; Jann-Yenq Liu
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Ιdentification of spatiotemporal seismicity clusters in central Ionian Islands (Greece) Phys. Earth Planet. Inter. (IF 2.237) Pub Date : 2021-02-10 Polyzois Bountzis; Anastasios Kostoglou; Eleftheria Papadimitriou; Vasileios Karakostas
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Seismic source characteristics of the 2016 Pedernales-Ecuador earthquake (Mw 7.8) Phys. Earth Planet. Inter. (IF 2.237) Pub Date : 2021-02-09 César Jiménez; Miguel Saavedra J.; Nick Moreno
The 2016 Pedernales earthquake (Mw 7.8), is part of the sequence of large earthquakes in Ecuador and Colombia: 1906 (~8.8 Mw), 1942 (Mw 7.8), 1958 (Mw 7.7), 1979 (Mw 8.2), all these events with a focal mechanism of the thrust fault type. In this research, we have obtained the seismic source distribution (indicating the presence of 2 main asperities), from inversion of teleseismic signals, as well as
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Archeomagnetic intensity variations during the era of geomagnetic spikes in the Levant Phys. Earth Planet. Inter. (IF 2.237) Pub Date : 2021-02-04 Philip W. Livermore; Yves Gallet; Alexandre Fournier
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A global Curie depth model utilising the equivalent source magnetic dipole method Phys. Earth Planet. Inter. (IF 2.237) Pub Date : 2021-02-14 M. Gard; D. Hasterok
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3-D time-domain electromagnetic modeling based on multi-resolution grid with application to geomagnetically induced currents Phys. Earth Planet. Inter. (IF 2.237) Pub Date : 2021-01-15 Jingyu Gao; Maxim Smirnov; Maria Smirnova; Gary Egbert
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High-pressure vibrational spectra of humite-group minerals: Fluorine effect on thermodynamic properties and hydrogen bonds Phys. Earth Planet. Inter. (IF 2.237) Pub Date : 2021-01-24 Dan Liu; Joseph R. Smyth; Xi Zhu; Yunfan Miao; Yancheng Hu; Guangchen Chen; Yu Ye
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Inversion of magnetic data using deep neural networks Phys. Earth Planet. Inter. (IF 2.237) Pub Date : 2021-01-16 Zhenlin Hu; Shuang Liu; Xiangyun Hu; Lihua Fu; Jie Qu; Huaijiang Wang; Qiuhua Chen
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Noise across Olduvai Subchron: Paleomagnetic study of a Pliocene lava succession from Javakheti Highland (Georgia, Lesser Caucasus) Phys. Earth Planet. Inter. (IF 2.237) Pub Date : 2020-12-29 Avto Goguitchaichvili; Berenice Gómez; Manuel Calvo Rathert; Vladimir Lebedev; Miguel Cervantes; Goga Vashakidze; Jemal Sologashvili; Juan Morales
Well-exposed lava sequences with available geochronological information may provide invaluable information on the fine characteristics of the Earth's magnetic field variation. A paleomagnetic study has been performed on twenty Pleistocene age, sub-horizontal lava flows in the Javakheti Highland (Lesser Caucasus). The sequence is formed by calc-alkaline basaltic lavas and is divided by a thin sedimentary
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Upper crustal velocity structure of the Ailaoshan-Red River shear zone and its implication for Cenozoic tectonic-magmatic activity: Evidence from ambient noise tomography using short-period dense seismic array Phys. Earth Planet. Inter. (IF 2.237) Pub Date : 2021-01-12 Mengjie Zheng; Zhiming Bai; Tao Xu; José Badal
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Seismic velocity structure of the upper inner core in the north polar region Phys. Earth Planet. Inter. (IF 2.237) Pub Date : 2020-12-26 Toshiki Ohtaki; Satoru Tanaka; Satoshi Kaneshima; Weerachai Siripunvaraporn; Songkhun Boonchaisuk; Sutthipong Noisagool; Kenji Kawai; Taewoon Kim; Yuki Suzuki; Yasushi Ishihara; Koji Miyakawa; Nozomu Takeuchi
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Thermocapillary effects in two-phase medium and applications to metal-silicate separation Phys. Earth Planet. Inter. (IF 2.237) Pub Date : 2021-01-04 Yanick Ricard; Stéphane Labrosse; Hidenori Terasaki; David Bercovici
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Stress recovery for the particle-in-cell finite element method Phys. Earth Planet. Inter. (IF 2.237) Pub Date : 2020-12-28 Haibin Yang; Louis N. Moresi; John Mansour
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Gravity data interpretation by a two-sided fault-like geologic structure using the global particle swarm technique Phys. Earth Planet. Inter. (IF 2.237) Pub Date : 2020-12-11 Khalid S. Essa; Salah A. Mehanee; Mahmoud Elhussein
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Seismic crustal shear velocity structure across NW Himalaya and Ladakh-Karakoram using receiver function modelling: Evidence of the Main Himalayan Thrust Phys. Earth Planet. Inter. (IF 2.237) Pub Date : 2021-01-04 Nagaraju Kanna; Sandeep Gupta
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Cracks and fluids in the Northeast Tibetan crust: New insight into seismotectonics Phys. Earth Planet. Inter. (IF 2.237) Pub Date : 2020-12-17 Anhui Sun; Dapeng Zhao; Huili Guo
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Disparate deformation of the crust and upper mantle beneath the Doda-Kisthwar region, NW Himalaya Phys. Earth Planet. Inter. (IF 2.237) Pub Date : 2020-12-28 Sunil K. Roy; D. Srinagesh; G. Suresh; D. Srinivas
This study attempts to characterize the nature of seismicity, anisotropy and coherency of deformation in the crust and upper mantle beneath the Doda- Kisthwar region (DKR), Jammu, located in the Kashmir seismic gap of NW Himalaya. Location of earthquakes using local waveforms, and shear wave splitting in local and teleseismic waveforms recorded at 5 temporary stations, are performed for this purpose
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MAGLAB: A computing platform connecting geophysical signatures to melting processes in Earth's mantle Phys. Earth Planet. Inter. (IF 2.237) Pub Date : 2020-12-29 Malcolm Massuyeau; Emmanuel Gardés; Grégory Rogerie; Sonja Aulbach; Sebastian Tappe; Emmanuel Le Trong; David Sifré; Fabrice Gaillard
Decompression melting of the upper mantle produces magmas and volcanism at the Earth's surface. Experimental petrology demonstrates that the presence of CO2 and H2O enhances peridotite melting anywhere within the upper mantle down to approximately 200–300 km depth. The presence of mantle melts with compositions ranging from carbonate-rich to silicate-rich unavoidably affects the geophysical signals
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Analyzing the geomagnetic axial dipole field moment over the historical period from new archeointensity results at Bukhara (Uzbekistan, Central Asia) Phys. Earth Planet. Inter. (IF 2.237) Pub Date : 2020-12-21 Marie Troyano; Yves Gallet; Agnès Genevey; Vladimir Pavlov; Alexandre Fournier; France Lagroix; Makhsuma Niyazova; Dzhamal Mirzaakhmedov
Since the mid-19th century, direct measurements of both intensity and directions of the Earth's magnetic field have been available, allowing an accurate determination of its spatio-temporal variations. Prior to this time, between ∼1600 and 1840, only direct directional measurements are available. Therefore, the construction of global field models over this period requires either a specific treatment
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High-pressure and high-temperature phase relations in the systems KAlSiO4-MgAl2O4 and CaAl2O4-MgAl2O4: Stability fields of NAL phases Phys. Earth Planet. Inter. (IF 2.237) Pub Date : 2020-12-10 Fumiya Kimura; Hiroshi Kojitani; Masaki Akaogi
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Heat diffusion in numerically shocked ordinary chondrites and its contribution to shock melting Phys. Earth Planet. Inter. (IF 2.237) Pub Date : 2020-12-10 Juulia-Gabrielle Moreau; Sabrina Schwinger
High pressure shock metamorphism in ordinary chondrites involves heating and melting of individual phases from shock entropy, pore collapse, frictional heating, and heat transfer. Numerical models using shock physics codes have recently been used to comprehend the mechanism of shock heating and melting in multiphase mesoscale models. Such models suggest that the formation of sulfide and metal melt
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Shear-wave splitting observations: Implications toward the variable anisotropic structure of the upper mantle below the Kachchh rift zone, Gujarat, India Phys. Earth Planet. Inter. (IF 2.237) Pub Date : 2020-12-01 Prantik Mandal
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3-D isotropic and anisotropic shallow crustal structure on Pingtan Island, Fujian, southeastern coast of China Phys. Earth Planet. Inter. (IF 2.237) Pub Date : 2020-11-30 Xihui Shao; Ying Liu; Huajian Yao; Jiajun Xu; Huiteng Cai; Xing Jin; Yayun Zhang; Haiyan Li; Bin Liu
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Investigation of crustal thickness and uppermost mantle velocity beneath Gujarat, western India, utilizing Moho reflected P phases Phys. Earth Planet. Inter. (IF 2.237) Pub Date : 2020-11-30 Himangshu Paul; Abhay Pandey; M. Ravi Kumar; Santosh Kumar
Crustal thickness and its variation can provide important insights into the tectonics of a region. The most popular methodology to determine crustal thickness – receiver function analysis utilizes converted phases from the Moho discontinuity. Although the reflection co-efficient is comparable to the transmission co-efficient, reflected phases are rarely used for determining crustal thickness. We tested
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An array based seismic image on the Dahutang deposit, South China: Insight into the mineralization Phys. Earth Planet. Inter. (IF 2.237) Pub Date : 2020-11-28 Zhou Zhang; Yangfan Deng; Junming Yao; Jianye Zong; Huayong Chen
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Simulation of Strong Ground Motion for an Mw 7.0 Earthquake beneath the Bhutan Himalaya in NE India and its trans-boundary seismic hazard implications Phys. Earth Planet. Inter. (IF 2.237) Pub Date : 2020-11-09 Babita Sharma; O.P. Mishra
We simulate the strong ground motion for an expected major earthquake (Mw 7.0) beneath the Bhutan Himalayan region with an empirical Green's function method using waveforms recorded from the 2009 Bhutan mainshock (Mw 6.1) and its largest aftershock (Mw 5.1). Fault orientation and location of the simulated event extend the length of the fault plane determined from the 2009 Bhutan mainshock and aftershock
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On waveform correlation measurement uncertainty with implications for temporal changes in inner core seismic waves Phys. Earth Planet. Inter. (IF 2.237) Pub Date : 2020-11-14 Karen H. Lythgoe; Maria I. Inggrid; Jiayuan Yao
We address the uncertainty related to cross-correlation waveform time shift measurements, particularly related to temporal changes in inner core seismic waves. Details of the cross-correlation measurement, including data processing, window length, pick time, sampling rate and the algorithm itself, all affect the calculated time shift. By systematically varying measurement parameters for a set of earthquake
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A comparison of oceanic and continental mantle lithosphere Phys. Earth Planet. Inter. (IF 2.237) Pub Date : 2020-11-04 Karen M. Fischer; Catherine A. Rychert; Colleen A. Dalton; Meghan S. Miller; Caroline Beghein; Derek L. Schutt
Over the last decade, seismological studies have shed new light on the properties of the mantle lithosphere and their physical and chemical origins. This paper synthesizes recent work to draw comparisons between oceanic and continental lithosphere, with a particular focus on isotropic velocity structure and its implications for mantle temperature and partial melt. In the oceans, many observations of
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On the relationship between excursions and paleomagnetic secular variation – Records from MIS 5, North Atlantic Ocean Phys. Earth Planet. Inter. (IF 2.237) Pub Date : 2020-11-21 Steve P. Lund; Martha Schwartz; Lloyd Keigwin
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New archeomagnetic secular variation data from Central Europe, II: Intensities Phys. Earth Planet. Inter. (IF 2.237) Pub Date : 2020-11-09 Elisabeth Schnepp; Daniele Thallner; Patrick Arneitz; Roman Leonhardt
Variations of the geomagnetic field during the past millennia can be obtained by investigating archeological material. The spatial distribution of the available data across Europe is rather uneven and only about 15% of the sites provide a full vector record of the geomagnetic field. Here we report 39 new reliable paleointensity data for sites from Austria, Germany and Switzerland, with ages ranging
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Deep structure beneath the southwestern flank of the Baikal rift zone and adjacent areas Phys. Earth Planet. Inter. (IF 2.237) Pub Date : 2020-11-18 Hanting Wu; Zhouchuan Huang; Dapeng Zhao
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A focused and constrained 2D inversion of potential field geophysical data through Delaunay triangulation, a case study for iron-bearing targeting at the Shavaz deposit in Iran Phys. Earth Planet. Inter. (IF 2.237) Pub Date : 2020-11-06 Maysam Abedi
This work illustrates the performance of a focused algorithm for 2D inversion of potential field geophysics (gravity and magnetic) in regions with rugged topography. A non-structured model discretization mesh is performed through Delaunay triangular cells to accurately represent the rugged observation surface and recover complex-shaped sources. Several synthetic single and multi-source targets are
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Modeling the pressure-dependent melting temperature of metals Phys. Earth Planet. Inter. (IF 2.237) Pub Date : 2020-10-28 Jianzuo Ma; Weiguo Li; Guoxin Yang; Shifeng Zheng; Yi He; Xin Zhang; Xuyao Zhang; Xi Zhang
We present a model of pressure-dependent melting temperature to describe the physical fact that both cooling and pressurization can cause the solidification of liquid metal. Based on the Force-Heat Equivalence Energy Density Principle, an equivalent relationship between the heat energy variations during cooling and the mechanical work during pressurization is established as the molten metal solidifies
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Construction of new archaeointensity reference curve for East Asia from 200 CE to 1100 CE Phys. Earth Planet. Inter. (IF 2.237) Pub Date : 2020-11-11 Yu Kitahara; Daiki Nishiyama; Masao Ohno; Yuhji Yamamoto; Yoshihiro Kuwahara; Tadahiro Hatakeyama
Archaeomagnetism is a research area that reconstructs ancient geomagnetic fields mainly using baked samples (especially baked artifacts) containing magnetic minerals such as magnetite and hematite. Archaeomagnetism can be applied to reveal temporal changes in the geomagnetic field related to deep-earth dynamics, and to estimate the age of archaeological remains and artifacts. Reconstruction methods
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Def3D, a FEM simulation tool for computing deformation near active faults and volcanic centers Phys. Earth Planet. Inter. (IF 2.237) Pub Date : 2020-10-26 Luyuan Huang; Bei Zhang; Yaolin Shi
Most analytical solutions of deformation near active and volcanic centers are limited to simple geometries and homogeneous media. To solve more complex problems, we have developed a FEM software package called Def3D for modeling deformation caused by earthquakes or magma chambers in laterally inhomogeneous media. Features presently available include modeling of split node technique, equivalent body
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Characteristics of magnetic anomalies and subsurface structure constraints of Balapur fault in Kashmir basin, NW Himalaya Phys. Earth Planet. Inter. (IF 2.237) Pub Date : 2020-10-24 Ayaz Mohmood Dar; S.K. Bukhari
The study used total magnetic intensity (TMI) data to evaluate the incidence and characteristics of the Balapur fault in the Kashmir basin, NW Himalaya. The ground magnetic surveys were carried out at ~25 m station spacing in various linear profiles and grids across the fault. The magnetic measurements external to the Earth were recorded after every minute to remove the diurnal variations. The convenient
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The Marsquake catalogue from InSight, sols 0–478 Phys. Earth Planet. Inter. (IF 2.237) Pub Date : 2020-10-24 John F. Clinton; Savas Ceylan; Martin van Driel; Domenico Giardini; Simon C. Stähler; Maren Böse; Constantinos Charalambous; Nikolaj L. Dahmen; Anna Horleston; Taichi Kawamura; Amir Khan; Guenolé Orhand-Mainsant; John-Robert Scholz; Fabian Euchner; William B. Banerdt; Philippe Lognonné; Don Banfield; Eric Beucler; Alexander E. Stott
The InSight (Interior Exploration using Seismic Investigations, Geodesy and Heat Transport) mission began collecting high quality seismic data on Mars in February 2019. This manuscript documents the seismicity observed by SEIS, InSight’s seismometer, from this time until the end of March 2020. Within the InSight project, the Marsquake Service (MQS) is responsible for prompt review of all seismic
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Attenuation of ground-motion spectral amplitudes in central and eastern Iran Phys. Earth Planet. Inter. (IF 2.237) Pub Date : 2020-10-22 H. Yazdi Makiabadi; A. Nasrabadi; M.R. Sepahvand
More than 2769 seismogram of 633 earthquakes recorded by 18 stations of the Iranian Seismological Center (IRSC) during 2006–2016, was selected to estimate spectral attenuation relation in the Central and eastern Iran. For each rotated combine horizontal record, a shear-wave window was selected, and a 5% taper was applied at each end of the window. In frequency domain by using a local regression smoothing
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Mantle and crust interaction scenario at the crust-mantle transition zone: Depicted from inter-layered pyroxenite-granulite xenolith in Hannuoba area, North China Craton Phys. Earth Planet. Inter. (IF 2.237) Pub Date : 2020-10-05 Ben-Xun Su; Jing Wang; Xia Liu; Yang Bai; Yue-Heng Yang; Zhi-An Bao; Patrick Asamoah Sakyi
Mantle-crust interaction occurring in various ways has been proposed for a long time, but the details of its mechanism at the crust-mantle transition zone and the lower crust are poorly known. This study reports a layered pyroxenite-granulite xenolith from the Cenozoic basalts of Hannouba in the North China Craton. Petrological and mineral chemical investigations reveal that the pyroxenite layers are
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Magnetic boundary layers in numerical dynamos with heterogeneous outer boundary heat flux Phys. Earth Planet. Inter. (IF 2.237) Pub Date : 2020-09-25 Filipe Terra-Nova; Hagay Amit
It has been proposed that magnetic flux expulsion due to outer core fluid upwellings may affect the geomagnetic secular variation on the core-mantle boundary (Bloxham, 1986). In this process intense horizontal field lines are concentrated below the outer boundary, introducing small radial length scales and consequently strong radial diffusion. Here we explore such magnetic boundary layers in numerical
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Aeromagnetic and remote sensing evidence for structural framework of the middle Niger and Sokoto basins, Nigeria Phys. Earth Planet. Inter. (IF 2.237) Pub Date : 2020-10-01 Naheem Banji Salawu; Julius Ogunmola Fatoba; Leke Sunday Adebiyi; Jimoh Ajadi; Aliyu Saleh; Silas Sunday Dada
High resolution aeromagnetic and Shuttle Radar Topography Mission data from parts of the N-S axis of the western half of Nigeria that covers the Middle Niger and Sokoto Basins provide a coherent picture for the surface expression of the linear and curvilinear features and the topography of the zone. It equally identifies the boundaries of the sedimentary basins with depths up to 950 m, thereby establishing
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First archeomagnetic data from Kenya and Chad: Analysis of iron furnaces from Mount Kenya and Guéra Massif Phys. Earth Planet. Inter. (IF 2.237) Pub Date : 2020-09-30 Brina Tchibinda Madingou; Gwenaël Hervé; Mireille Perrin; Freda Nkirote M'Mbogori; Djimet Guemona; Pierre-Etienne Mathé; Pierre Rochette; David Williamson; Vincent Mourre; Caroline Robion-Brunner
The variation of the Earth's magnetic field over the last millennia is poorly known in Africa, especially in Sub-Saharan Africa that represents less than 1% of the global archeomagnetic dataset. Fourteen iron furnaces from Kenya and Chad have been studied here for archeomagnetic purposes. These structures were dated by 14C from the 14th century in Kenya and from the 18-19th centuries in Chad. Samples
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An updated archeomagnetic directional variation curve for France over the past two millennia, following 25 years of additional data acquisition Phys. Earth Planet. Inter. (IF 2.237) Pub Date : 2020-10-02 Maxime Le Goff; Yves Gallet; Nicolas Warmé; Agnès Genevey
Nearly 40 years ago, Emile Thellier published an article summarizing the archeomagnetic data he had obtained during his career, which had allowed him to recover the main features of the directional variations of the geomagnetic field in France for the last two millennia. This database went on to be significantly completed 25 years ago by Ileana Bucur, who had taken over Thellier's work on archeomagnetism;
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Companion guide to the Marsquake catalog from InSight, sols 0–478: Data content and non-seismic events Phys. Earth Planet. Inter. (IF 2.237) Pub Date : 2020-10-10 Savas Ceylan; John F. Clinton; Domenico Giardini; Maren Böse; Constantinos Charalambous; Martin van Driel; Anna Horleston; Taichi Kawamura; Amir Khan; Guenolé Orhand-Mainsant; John-Robert Scholz; Simon C. Stähler; Fabian Euchner; William B. Banerdt; Philippe Lognonné; Don Banfield; Eric Beucler; Raphaël F. Garcia; Clément Perrin
The InSight (Interior Exploration using Seismic Investigations, Geodesy and Heat Transport) mission landed on the surface of Mars on November 26, 2018. One of the scientific instruments in the payload that is essential to the mission is the SEIS package (Seismic Experiment for Interior Structure) which includes a very broadband and a short period seismometer. More than one year since the landing, SEIS
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New high precision full-vector archaeomagnetic data from a roman kiln in Mérida (Spain) Phys. Earth Planet. Inter. (IF 2.237) Pub Date : 2020-09-26 N. García-Redondo; M. Calvo-Rathert; A. Carrancho; M. Bustamante-Álvarez
This study presents new high precision age and full-vector archaeomagnetic data from a kiln excavated in the Roman archaeological site of Mitreo's house (Mérida, Badajoz, Spain). The age of the kiln was obtained by the stratigraphic method and by the ceramological study of the italic and sigillata pottery found with a very precise age date of 55 ± 15 years AD. Rock-magnetic experiments pointed towards
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Three-dimensional shear-wave velocity structure under the Weifang segment of the Tanlu fault zone in eastern China inferred from ambient noise tomography with a short-period dense seismic array Phys. Earth Planet. Inter. (IF 2.237) Pub Date : 2020-09-26 Chen Ma; Jianshe Lei; Xiwei Xu
In this study continuous waveforms are observed at a short-period dense seismic array which consisted of 302 stations in the Weifang segment of the Tanlu fault zone from August to October 2017. A total of 122,302 Rayleigh wave phase velocity dispersion curves at 1.0–7.5 s periods are extracted to infer a high-resolution shear-wave tomography model of the shallow crust under the region. Our model well
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Modular finite volume approach for 3D magnetotelluric modeling of the Earth medium with general anisotropy Phys. Earth Planet. Inter. (IF 2.237) Pub Date : 2020-09-18 Zeqiu Guo; Gary Egbert; Hao Dong; Wenbo Wei
Electrical property of the Earth should be best depicted by anisotropic 3D models, while many numerical issues remain to be solved before it becomes practical, such as implementation complexity and computational efficiency. Magnetotellurics (MT) is the primary method to explore electrical property of the deep Earth, and MT forward modeling with 3D anisotropy has been investigated primarily by finite
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Crustal model in eastern Qinghai-Tibet plateau and western Yangtze craton based on conditional variational autoencoder Phys. Earth Planet. Inter. (IF 2.237) Pub Date : 2020-09-21 Xianqiong Cheng; Kezhi Jiang
Eastern margin of the Qinghai-Tibet plateau and western margin of the Yangtze craton has a complex crust-mantle structure and is an important region for studying the crust-mantle deformation mechanism. Because the Rayleigh surface wave group velocity has a strong constraint on the structure of the crust and upper mantle, a lot of researches have used the Rayleigh surface wave group velocity to invert