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Seismic detection of the martian core
Science ( IF 56.9 ) Pub Date : 2021-07-23 , DOI: 10.1126/science.abi7730
Simon C Stähler 1 , Amir Khan 1, 2 , W Bruce Banerdt 3 , Philippe Lognonné 4 , Domenico Giardini 1 , Savas Ceylan 1 , Mélanie Drilleau 5 , A Cecilia Duran 1 , Raphaël F Garcia 5 , Quancheng Huang 6 , Doyeon Kim 6 , Vedran Lekic 6 , Henri Samuel 4 , Martin Schimmel 7 , Nicholas Schmerr 6 , David Sollberger 1 , Éléonore Stutzmann 4 , Zongbo Xu 4 , Daniele Antonangeli 8 , Constantinos Charalambous 9 , Paul M Davis 10 , Jessica C E Irving 11 , Taichi Kawamura 4 , Martin Knapmeyer 12 , Ross Maguire 6 , Angela G Marusiak 3 , Mark P Panning 3 , Clément Perrin 13 , Ana-Catalina Plesa 12 , Attilio Rivoldini 14 , Cédric Schmelzbach 1 , Géraldine Zenhäusern 1 , Éric Beucler 13 , John Clinton 15 , Nikolaj Dahmen 1 , Martin van Driel 1 , Tamara Gudkova 16 , Anna Horleston 11 , W Thomas Pike 9 , Matthieu Plasman 4 , Suzanne E Smrekar 3
Affiliation  

Clues to a planet’s geologic history are contained in its interior structure, particularly its core. We detected reflections of seismic waves from the core-mantle boundary of Mars using InSight seismic data and inverted these together with geodetic data to constrain the radius of the liquid metal core to 1830 ± 40 kilometers. The large core implies a martian mantle mineralogically similar to the terrestrial upper mantle and transition zone but differing from Earth by not having a bridgmanite-dominated lower mantle. We inferred a mean core density of 5.7 to 6.3 grams per cubic centimeter, which requires a substantial complement of light elements dissolved in the iron-nickel core. The seismic core shadow as seen from InSight’s location covers half the surface of Mars, including the majority of potentially active regions—e.g., Tharsis—possibly limiting the number of detectable marsquakes.



中文翻译:

火星核心的地震探测

行星地质历史的线索包含在其内部结构中,尤其是其核心。我们使用 InSight 地震数据检测到来自火星核心 - 地幔边界的地震波反射,并将其与大地测量数据一起反演,以将液态金属核心的半径限制在 1830 ± 40 公里。大核心意味着火星地幔在矿物学上与陆地上地幔和过渡带相似,但与地球不同,因为没有以布里奇曼岩为主的下地幔。我们推断出平均核密度为每立方厘米 5.7 至 6.3 克,这需要大量溶解在铁镍核中的轻元素。从洞察号的位置看到的地震核心阴影覆盖了火星表面的一半,包括大部分潜在的活动区域——例如,

更新日期:2021-07-23
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