Brinkman, Nienke ORCID: 0000-0002-1842-0834, Stahler, Simon C., Giardini, Domenico, Schmelzbach, Cedric ORCID: 0000-0003-1380-8714, Khan, Amir, Jacob, Alice ORCID: 0000-0002-5114-6697, Fuji, Nobuaki ORCID: 0000-0002-0886-0510, Perrin, Clement, Lognonne, Philippe ORCID: 0000-0002-1014-920X, Beucler, Eric ORCID: 0000-0003-2605-4990, Bose, Maren ORCID: 0000-0003-4639-719X, Ceylan, Savas, Charalambous, Constantinos, Clinton, John F., van Driel, Martin, Euchner, Fabian, Horleston, Anna, Kawamura, Taichi ORCID: 0000-0001-5246-5561, Knapmeyer-Endrun, Brigitte ORCID: 0000-0003-3309-6785, Mainsant, Guenole, Panning, Mark P., Pike, William T., Scholz, John-Robert, Robertsson, Johan O. A. and Banerdt, William B. (2021). First Focal Mechanisms of Marsquakes. J. Geophys. Res.-Planets, 126 (4). WASHINGTON: AMER GEOPHYSICAL UNION. ISSN 2169-9100

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Abstract

Since February 2019, NASA's InSight lander is recording seismic signals on the planet Mars, which, for the first time, allows to observe ongoing tectonic processes with geophysical methods. A number of Marsquakes have been located in the Cerberus Fossae graben system in Elysium Planitia and further west, in the Orcus Patera depression. We present a first study of the focal mechanisms of three well-recorded events (S0173a, S0183a, S0235b) to determine the processes dominating in the source region. We infer for all three events a predominantly extensional setting. Our method is adapted to the case of a single, multicomponent receiver and based on fitting waveforms of P and S waves against synthetic seismograms computed for the initial crustal velocity model derived by the InSight team. We explore the uncertainty due to the single-station limitation and find that even data recorded by one station constrains the mechanisms (reasonably) well. For the events in the Cerberus Fossae region (S0173a, S0235b) normal faulting with a relatively steep dipping fault plane is inferred, suggesting an extensional regime mainly oriented E-W to NE-SW. The fault regime in the Orcus Patera region is not determined uniquely because only the P wave can be used for the source inversion. However, we find that the P and weak S waves of the S0183a event show similar polarities to the event S0173, which indicates similar fault regimes.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Brinkman, NienkeUNSPECIFIEDorcid.org/0000-0002-1842-0834UNSPECIFIED
Stahler, Simon C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Giardini, DomenicoUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Schmelzbach, CedricUNSPECIFIEDorcid.org/0000-0003-1380-8714UNSPECIFIED
Khan, AmirUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Jacob, AliceUNSPECIFIEDorcid.org/0000-0002-5114-6697UNSPECIFIED
Fuji, NobuakiUNSPECIFIEDorcid.org/0000-0002-0886-0510UNSPECIFIED
Perrin, ClementUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lognonne, PhilippeUNSPECIFIEDorcid.org/0000-0002-1014-920XUNSPECIFIED
Beucler, EricUNSPECIFIEDorcid.org/0000-0003-2605-4990UNSPECIFIED
Bose, MarenUNSPECIFIEDorcid.org/0000-0003-4639-719XUNSPECIFIED
Ceylan, SavasUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Charalambous, ConstantinosUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Clinton, John F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
van Driel, MartinUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Euchner, FabianUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Horleston, AnnaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kawamura, TaichiUNSPECIFIEDorcid.org/0000-0001-5246-5561UNSPECIFIED
Knapmeyer-Endrun, BrigitteUNSPECIFIEDorcid.org/0000-0003-3309-6785UNSPECIFIED
Mainsant, GuenoleUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Panning, Mark P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Pike, William T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Scholz, John-RobertUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Robertsson, Johan O. A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Banerdt, William B.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-601877
DOI: 10.1029/2020JE006546
Journal or Publication Title: J. Geophys. Res.-Planets
Volume: 126
Number: 4
Date: 2021
Publisher: AMER GEOPHYSICAL UNION
Place of Publication: WASHINGTON
ISSN: 2169-9100
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
SINGLE-STATION; SOURCE INVERSION; WAVE; EARTHQUAKES; SEISMICITY; MAGNITUDE; LOCATION; MODERATE; STRESSMultiple languages
Geochemistry & GeophysicsMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/60187

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