Seismic detection of the martian core

doi:10.1126/science.abi7730

GSTDTAP > 气候变化

DOI	10.1126/science.abi7730
	Seismic detection of the martian core
	Simon C. Stähler; Amir Khan; W. Bruce Banerdt; Philippe Lognonné; Domenico Giardini; Savas Ceylan; Mélanie Drilleau; A. Cecilia Duran; Raphaël F. Garcia; Quancheng Huang; Doyeon Kim; Vedran Lekic; Henri Samuel; Martin Schimmel; Nicholas Schmerr; David Sollberger; Éléonore Stutzmann; Zongbo Xu; Daniele Antonangeli; Constantinos Charalambous; Paul M. Davis; Jessica C. E. Irving; Taichi Kawamura; Martin Knapmeyer; Ross Maguire; Angela G. Marusiak; Mark P. Panning; Clément Perrin; Ana-Catalina Plesa; Attilio Rivoldini; Cédric Schmelzbach; Géraldine Zenhäusern; Éric Beucler; John Clinton; Nikolaj Dahmen; Martin van Driel; Tamara Gudkova; Anna Horleston; W. Thomas Pike; Matthieu Plasman; Suzanne E. Smrekar
	2021-07-23
发表期刊	Science
出版年	2021
英文摘要	Because of the lack of direct seismic observations, the interior structure of Mars has been a mystery. Khan et al. , Knapmeyer-Endrun et al. , and Stähler et al. used recently detected marsquakes from the seismometer deployed during the InSight mission to map the interior of Mars (see the Perspective by Cottaar and Koelemeijer). Mars likely has a 24- to 72-kilometer-thick crust with a very deep lithosphere close to 500 kilometers. Similar to the Earth, a low-velocity layer probably exists beneath the lithosphere. The crust of Mars is likely highly enriched in radioactive elements that help to heat this layer at the expense of the interior. The core of Mars is liquid and large, ∼1830 kilometers, which means that the mantle has only one rocky layer rather than two like the Earth has. These results provide a preliminary structure of Mars that helps to constrain the different theories explaining the chemistry and internal dynamics of the planet. Science , abf2966, abf8966, abi7730, this issue p. [434][1], p. [438][2], p. [443][3] see also abj8914, p. [388][4] 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. [1]: /lookup/doi/10.1126/science.abf2966 [2]: /lookup/doi/10.1126/science.abf8966 [3]: /lookup/doi/10.1126/science.abi7730 [4]: /lookup/doi/10.1126/science.abj8914
领域	气候变化 ; 资源环境
URL	查看原文
引用统计
文献类型	期刊论文
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/334496
专题	气候变化资源环境科学
推荐引用方式 GB/T 7714	Simon C. Stähler,Amir Khan,W. Bruce Banerdt,et al. Seismic detection of the martian core[J]. Science,2021.
APA	Simon C. Stähler.,Amir Khan.,W. Bruce Banerdt.,Philippe Lognonné.,Domenico Giardini.,...&Suzanne E. Smrekar.(2021).Seismic detection of the martian core.Science.
MLA	Simon C. Stähler,et al."Seismic detection of the martian core".Science (2021).