Disastrous earthquakes and hurricanes, in general, are not contemporaneous. Here, we report the 2007 Cerralvo earthquake that had stricken the Gulf of California (GoC) when Hurricane Henriette landed during the aftershock activity. The greatest aftershock struck almost at the same time with Hurricane Henriette inducing panic among the inhabitants of La Paz, Baja California, peninsula. After the earthquake’s

Two days after the University of Utah Seismograph Stations (UUSS) staff were required to leave campus and work remotely, an Mw 5.7 earthquake struck the Salt Lake Valley near the town of Magna, Utah. This event was the largest instrumentally recorded earthquake in the Salt Lake Valley and the largest earthquake ever felt by most residents. The timing of this event—at the start of a lockdown in response

The continuity of monitoring operations at national earthquake centers during crisis is an important challenge. In 2020, because of the COronaVIrus Disease 2019 (COVID‐19) health emergency, monitoring centers all over the world faced new, unexpected problems. In Italy, the Istituto Nazionale di Geofisica e Vulcanologia (INGV) has the duty to perform earthquake and volcano monitoring, seismic surveillance

In the summer of 2018, Kīlauea Volcano underwent one of its most significant eruptions in the past few hundred years. The volcano’s summit and East Rift Zone magma system partially drained, resulting in a series of occasionally explosive partial caldera collapses, and widespread lava flows in the lower East Rift Zone. The Hawaiian Volcano Observatory (HVO) operates a robust permanent monitoring network

Rapid response to destructive tsunami and seismic events requires rapid determination of the earthquake magnitude. We propose a new method that employs peak ground velocities (PGVs) derived from Global Navigation Satellite System (GNSS) data to estimate earthquake magnitudes. With a total of 1434 records from 22 events as the constraints, we perform the regression and obtain a PGV scaling law for magnitude

Trains are now recognized as powerful sources for seismic interferometry based on noise correlation, but the optimal use of these signals still requires a better understanding of their source mechanisms. Here, we present a simple approach for modeling train‐generated signals inspired by early work in the engineering community, assuming that seismic waves are emitted by sleepers regularly spaced along

Following a governmental decision to build a national earthquake early warning system (EEWS) named TRUAA, the Geological Survey of Israel has upgraded the national Israeli Seismic Network with more than 100 stations countrywide. The stations are spread mainly along the main hazardous fault systems of the Dead Sea and Carmel‐Zfira, which potentially may produce Mw 7.5 earthquakes. Currently the system

Juan Antonio Madrid González, a retired research seismologist at the Centro de Investigación Científica y de Educación Superior de Ensenada, Baja California (CICESE), passed away on 27 September 2019 in Ensenada, Baja California, Mexico. He was one of the founders of CICESE and its Department of Seismology.Juanito (as some colleagues called him) was born and grew up at Torreón city in the state of

Seismic networks and operations centers are critical facilities around the world. These facilities not only collect and archive data that are available for learning about earth structure and hazard, but also are responsible for disseminating timely information to various user groups that allow for the response to ground shaking, warnings related to impending volcanic and tsunami situations, and the

The Japan Meteorological Agency (JMA) is a governmental organization that has responsibilities for mitigation of natural disasters. JMA issues warnings and information about natural disasters, in addition to daily weather forecasts. When an earthquake occurs, JMA analyzes seismic data to issue an earthquake early warning and to warn of possible tsunamis when a tsunami is expected to strike coastal

The 23 June 2020 La Crucecita earthquake occurred at 10:29 hr on the coast of Oaxaca in an Mw 7.4 megathrust event at 22.6 km depth and triggered a tsunami recorded at tide gauge stations and a Deep‐ocean Assessment and Reporting of Tsunamis off the coast of Mexico. Immediately after the earthquake, a rapid response effort was coordinated by members of the Tsunami and Paleoseismology Laboratory, Universidad

In March 2020, the coronavirus disease 2019 outbreak was declared a pandemic by the World Health Organization and became a global health crisis. Authorities worldwide implemented lockdowns to restrict travel and social exchanges in a global effort to counter the pandemic. In France, and in French overseas departments, the lockdown was effective from 17 March to 11 May 2020. It was in this context that

We describe the regular pre‐COVID mode of operations for the Canadian National Seismograph Network and the associated monitoring, alerting, and analysis for earthquakes in Canada; we describe how the current operational posture evolved and discuss the ways in which the posture was and was not suitable to respond to the challenges and constraints of the COVID‐19 situation in Canada. We find that many

Between 2008 and 2014, the Institut de Physique du Globe de Paris (IPGP) and the University of the West Indies, Seismic Research Centre (UWI‐SRC) designed and built a regional seismic network across the Lesser Antilles. One of the goals of the network is to provide real‐time seismic data to the tsunami warning centers in the framework of the Intergovernmental Coordination Group working toward the establishment

The COVID‐19 pandemic is an ongoing global health emergency that has overshadowed almost all aspects of human life in most of the world. The seismic monitoring centers are a crucial component of the earthquake crisis management, and continuity of their operations during different crises is critical. Occurrence of any unusual condition (such as COVID‐19 crisis) could result in failures in detecting

Mexico is a seismically active country. Earthquakes with magnitudes larger than 7.0 happen, on average, every other year. This fact requires a rapid and consistent response from the national monitoring agency, the Servicio Sismológico Nacional, SSN (Mexican National Seismological Service). For this purpose, in 2014, the SSN created a set of procedures for the daily operations and rapid response called

The severe mobility restrictions imposed countrywide by authorities of Chile in response to the pandemic of severe acute respiratory syndrome coronavirus 2 (SARS‐CoV‐2) have impacted all areas of activities. Major difficulties began in March 2020, with partial quarantines in the capital city, which later extended to other cities in the country, and it soon transformed in total confinement. We examine

On 24 January 2020 (UTC), a destructive Mw 6.7 earthquake struck the east Anatolian fault of eastern Turkey after a series of foreshocks, causing many casualties and significant property damage. In this study, the rupture process of this earthquake is investigated with teleseismic broadband body‐wave and surface‐wave records. Results indicate that this earthquake is a left‐lateral strike‐slip event

The La Crucecita earthquake ruptured on the megathrust, generating strong shaking and a modest but long‐lived tsunami. This is a significant earthquake that illuminates important aspects of the behavior of the megathrust as well as the potential related hazards. The rupture is contained within 15–30 km depth, ground motions are elevated, and the energy to moment ratio is high. We argue that it represents

Hydraulic fracturing (HF) at Preston New Road (PNR), Lancashire, United Kingdom, in August 2019, induced a number of felt earthquakes. The largest event (⁠ML 2.9) occurred on 26 August 2019, approximately three days after HF operations at the site had stopped. Following this, in November 2019, the United Kingdom Government announced a moratorium on HF for shale gas in England. Here we provide an analysis

The occurrence of the 4–6 July 2019 Mw 6.4 and Mw 7.1 Ridgecrest earthquake sequence provided the first full‐scale test of the network and telemetry readiness of the Southern California Seismic Network (SCSN), to support the ShakeAlert earthquake early warning (EEW) system in California. ShakeAlert is a U.S. Geological Survey (USGS)‐led collaboration to detect earthquakes and, when possible, to alert

Evidence for fluid‐injection‐induced seismicity is rare in California hydrocarbon basins, despite widespread injection close to seismically active faults. We investigate a potential case of injection‐induced earthquakes associated with San Ardo oilfield operations that began in the early 1950s. The largest potentially induced events occurred in 1955 (⁠ML 5.2) and 1985 (⁠Mw 4.5) within ∼6 km from the

We develop ensemble ShakeMaps for various magnitude 9 (⁠M 9) earthquakes on the Cascadia megathrust. Ground‐shaking estimates are based on 30 M 9 Cascadia earthquake scenarios, which were selected using a logic‐tree approach that varied the hypocenter location, down‐dip rupture limit, slip distribution, and location of strong‐motion‐generating subevents. In a previous work, Frankel et al. (2018) used

We present a compilation of 2131 high‐fidelity mechanisms and centroid depths of moderate‐magnitude earthquakes derived using synthetic body‐waveform modeling (the Global Waveform‐Modelled Earthquake Catalog v1.0—gWFM), which can be visualized and downloaded online (see Data and Resources). In this article, we describe the methods used to construct the gWFM and present a comparison between the earthquake

The aleatory‐variability component (standard deviation) of a ground motion has a large influence on results of a probabilistic seismic hazard assessment. kappa, a measure of high‐frequency attenuation, has site‐ and record‐specific effects that have been suggested as reasons for observing heteroscedastic aleatory variability within earthquake ground motions. Specifically, kappa has been proposed as

In recent years, as the amount of seismic data has grown rapidly, it is very important to develop a fast and reliable event detection and association algorithm. Generally, event detection is first performed on individual stations followed by event association through linking phase arrivals to a common event generating them. This study considers earthquake detection as the problem of image classification

The ability to calculate the seismogram of an earthquake at a local or regional scale is critical but challenging for many seismological studies because detailed knowledge about the 3D heterogeneities in the Earth’s subsurface, although essential, is often insufficient. Here, we present an application of compressed sensing technology that can help predict the seismograms of earthquakes at any position

In the past two decades, three major earthquakes have occurred near the Longmen Shan fault zone, Sichuan, China (the 2008 Mw 7.9 Wenchuan, 2013 Mw 6.6 Lushan, and 2017 Mw 6.5 Jiuzhaigou earthquakes), in response to the continuous collision of the Indian and Eurasian plates, and have produced numerous aftershocks. Recent studies have demonstrated that physics‐based aftershock forecasting holds the potential

Given the deficiency of recorded strong ground‐motion data, it is important to understand the effects of earthquake rupture processes on near‐source ground‐motion characteristics and to develop physics‐based ground‐motion simulation methods for advanced seismic hazard assessments. Recently, the interfrequency correlation of ground motions has become an important element of ground‐motion predictions

We provide an overview of a 2019 workshop on the use of fragile geologic features (FGFs) to evaluate seismic hazard models. FGFs have been scarcely utilized in the evaluation of seismic hazard models, despite nearly 30 yr having passed since the first recognition of their potential value. Recently, several studies have begun to focus on the implementation of FGFs in seismic hazard modeling. The workshop

This article discusses the earthquake early warning system (EEWS) for schools of the National Center for Research on Earthquake Engineering, Taiwan (NCREE’s EEWS, earthquake early warning system [NEEWS]) that was recently completed. The system consists of 98 seismic stations with a complete set of system capabilities and 3514 broadcast stations with only the associated alert broadcast system capabilities

The recent discovery of gravitational waves (GWs) and their potential for cosmic observations prompted the design of the future third‐generation GW interferometers, able to extend the observation distance for sources up to the frontier of the Universe. In particular, the European detector Einstein Telescope (ET) has been proposed to reach peak strain sensitivities of about 3×10−25 Hz−1/2 in the 100 Hz

We show the equivalence of earthquake‐induced ground acceleration and water‐pressure waveforms for the case of collocated hydrophones and seafloor seismometers installed in shallow water. In particular, the comparison of the waveforms and amplitude spectra of the acceleration and water‐pressure signals confirms the existence of a frequency range of “forced oscillations” in which the water‐pressure

We describe the seismoacoustic wavefield recorded outdoors but inside the facility fence of the High Flux Isotope Reactor (HFIR) at Oak Ridge National Laboratory (Tennessee). HFIR is a research nuclear reactor that generates neutrons for scattering, irradiation research, and isotope production. This reactor operates at a nominal power of 85 MW, with a full‐power period between 24 and 26 days. This

The impressive performance that deep neural networks demonstrate on a range of seismic monitoring tasks depends largely on the availability of event catalogs that have been manually curated over many years or decades. However, the quality, duration, and availability of seismic event catalogs vary significantly across the range of monitoring operations, regions, and objectives. Semisupervised learning

We report the first thorough seismological study of the Shanghai Tower, the second tallest building in the world, by applying seismic interferometry to ambient noise recorded by a dense seismic array. We extract the building responses by deconvolution of the seismic vibrations for three components of the impulse response functions (IRFs), and retrieve two wave types corresponding to vertical and horizontal

Local seismic events recorded by the large‐N Incorporated Research Institutions for Seismology Community Wavefield Experiment in Oklahoma are used to estimate Moho reflections near the array. For events within 50 km of the center of the array, normal moveout corrections and receiver stacking are applied to identify the PmP and SmS Moho reflections on the vertical and transverse components. Corrections

The upper‐crustal anisotropy of the Cantabrian Mountains (North Spain) has been investigated using two independent but complementary methodologies: (a) shear‐wave splitting and (b) ambient seismic noise interferometry. For this purpose, we have processed and compared seismic data from two networks with different scales and recording periods. The shear‐wave splitting results show delay times between

Destructive large earthquakes occur not only along major plate boundaries but also within the interior of plates. To establish appropriate safety measures, identifying intraplate active faults and the potential magnitude of associated earthquakes is essential before an earthquake occurs. This study was conducted to document the geomorphic expression of a previously unrecognized 50‐km‐long active fault

Macroseismic intensities play a key role in the engineering, seismological, and loss modeling communities. However, at present, there is an increasing demand for instrumental data‐based loss estimations that require statistical relationships between intensities and strong‐motion data. In New Zealand, there was an urgent need to update the ground motion to intensity conversion equation (GMICE) from

Although small earthquakes are expected to produce weak shaking, ground motion is highly variable and there are outlier earthquakes that generate more shaking than expected—sometimes significantly more. We explore datasets of M 0.5–8.3 earthquakes to determine the relative impact of frequent, smaller‐magnitude earthquakes that rarely produce strong ground motion, to rare, large earthquakes that always

Machine‐learning algorithms continue to show promise in their application to seismic processing. The U.S. Geological Survey National Earthquake Information Center (NEIC) is exploring the adoption of these tools to aid in simultaneous local, regional, and global real‐time earthquake monitoring. As a first step, we describe a simple framework to incorporate deep‐learning tools into NEIC operations. Automatic

T‐waves are acoustic waves generated by earthquakes at the land–water interface. They can propagate efficiently for thousands of kilometers within the ocean’s low‐velocity waveguide—the SOund Fixing And Ranging (SOFAR) channel. In the present work, we studied T‐waves that propagate in the Ionian basin and are generated by regional earthquakes (epicentral distance <1000 km⁠) located in the Hellenic

The Crittenden County fault zone (CCFZ) is a potentially active fault zone located within 25 km of Memphis, Tennessee, and poses a significant seismic hazard to the region. Previous research has associated the fault zone with basement faults of the eastern Reelfoot rift margin (ERRM) and described it as a northeast‐striking, northwest‐dipping reverse fault. However, we suggest that there is an incomplete

The estimation of the earthquake size distribution parameters is one of the most important parts in any seismic hazard study. GR_EST toolbox is a source code written for OCTAVE/MATLAB (Eaton et al., 2019; MATLAB, 2019) that allows estimating these parameters in a proper way, including the estimation of the associated uncertainties. The toolbox contains functions to make the parameter estimation both

We introduce SeisNoise.jl, a library for high‐performance ambient seismic noise cross correlation, written entirely in the computing language Julia. Julia is a new language, with syntax and a learning curve similar to MATLAB (see Data and Resources), R, or Python and performance close to Fortran or C. SeisNoise.jl is compatible with high‐performance computing resources, using both the central processing

The microseism is the strongest component of background seismic noise that masks seismic signals recorded by ocean‐bottom seismographs (OBSs). Such undesired noise hampers the identification of critical seismic phases and sometimes even the entire waveform. Here, we introduce the data adaptive polarization filter (DAPF), an approach that suppresses random signals from the background seismic‐noise significantly

Long‐term and large‐scale observations of dynamic earthquake triggering are urgently needed to understand the mechanism of earthquake interaction and assess seismic hazards. We developed a robust Python package termed DynTriPy to automatically detect dynamic triggering signals by distinguishing anomalous seismicity after the arrival of remote earthquakes. This package is an efficient implementation

We developed a Python package—easyQuake—that consists of a flexible set of tools for detecting and locating earthquakes from International Federation of Digital Seismograph Networks‐collected or field‐collected seismograms. The package leverages a machine‐learning driven phase picker, coupled with an associator, to produce a Quake Markup Language (QuakeML) style catalog complete with magnitudes and

A Roman theater is recently being excavated at Beit‐Ras/Capitolias in Jordan, which is one of the Decapolis cities, founded before A.D. 97/98. This is an archaeoseismological study that aims to investigate the temporal and intensity impacts of past earthquakes on the theater’s existing structure. A rich set of earthquake archaeological effects were identified, including deformed arches, tilted and

The city of İznik (ancient Nicaea), located on the middle strand of the North Anatolian fault zone (MNAF), presents outstanding archeological monuments preserved from the Roman and Ottoman periods (first to fifteenth centuries A.D.), bearing deformations that can be linked to past seismic shaking. To constrain the date and intensity of these historical earthquakes, a systematic survey of earthquake

I discuss how much attention different earthquakes get in the scientific and nonscientific literature. For the former, all earthquakes above magnitude 7.5 appear in a scientific article, and the number of articles tends to increase with magnitude. For the latter, most shocks, even if damaging, become largely forgotten in a few decades, though some, such as the 1906 San Francisco earthquake, live on

On 3 May 2018, Kīlauea Volcano, one of the most active volcanoes in the world, entered a new eruptive phase because of a dike intrusion in the East Rift zone. One day later, an Mw 6.9 earthquake, which was likely trigged by the dike intrusion, occurred in the submarine south flank of Kīlauea Volcano. In mid‐July, an ocean‐bottom seismometer (OBS) array consisting of 12 stations was deployed on the

When originally published online on 2 September 2020, Figures 1 and 8 in Acevedo et al. (2020) contained errors, as described in the following. The original Figures 1 and 8 contained have been replaced in the online version (both HTML and PDF) and the printed version of the article, which will be available alongside this erratum. The caption of Figure 1 has been modified to include the reference Pulgar

SRL is indebted to the dedicated people who provide peer reviews of submitted papers. Providing a conscientious and timely review is a vital service, both to ps and to readers. The Editorial Board would like to express sincere gratitude to the following people, who completed one or more reviews between November 2019 and October 2020. We apologize for errors or omissions.Brad AagaardNicholas AckerleyJohn

Keith Koper has ambitious plans as the founding Editor‐in‐Chief of The Seismic Record, Seismological Society of America’s (SSA) new open‐access online journal that will publish its first issue in 2021. The journal was launched partly in response to SSA member input supporting an open‐access journal that could provide rapid peer review and publication of recent events and current topics of strong significance

As part of the National Science Foundation (NSF) funded EarthScope project, the USArray Transportable Array (TA) in Alaska and western Canada deployed near 200 telemetered broadband seismic and infrasound stations. This systematic coverage of continental Alaska and northwest Canada has provided an unprecedented dataset for the seismological community. The primary scientific target of EarthScope has

Alaska is the last frontier and final destination for the National Science Foundation‐supported EarthScope USArray Transportable Array (TA) project. The goal of this project is to record earthquakes and image the structure of the North American continent. The Alaska TA consists of 283 broadband seismic stations evenly spaced about 85 km apart to cover the state of Alaska and into western Canada. The

Between 2014 and 2017, almost 200 new seismic stations were installed in Alaska and northwestern Canada as part of the EarthScope USArray Transportable Array. These stations currently provide an unprecedented capability for the detection and location of seismic events in regions with otherwise relatively sparse station coverage. Two interesting earthquake sequences in 2018 and 2019 in the northeastern

We examine three continuously recording data sets related to the aurora: all‐sky camera images, three‐component magnetometer data, and vertical‐component, broadband seismic data as part of the EarthScope project (2014 to present). Across Alaska there are six all‐sky cameras, 13 magnetometers, and >200 seismometers. The all‐sky images and magnetometers have the same objective, which is to monitor space