TY - JOUR
T1 - High- and Low-Frequency Waveform Analysis the Marsquake of Sol 1222
T2 - Focal Mechanism, Centroid Moment Tensor Inversion and Source Time Function
AU - Malytskyy, D.
AU - Křížová, D.
AU - Lognonné, P.
AU - Kawamura, T.
AU - Perrin, C.
AU - Plasman, M.
AU - Xu, Z.
AU - Maguire, R.
N1 - Publisher Copyright:
© 2024 The Authors. Earth and Space Science published by Wiley Periodicals LLC on behalf of American Geophysical Union.
PY - 2024/3
Y1 - 2024/3
N2 - The seismometer onboard InSight NASA Mars mission discovered a seismically active planet. We focused on the strongest event named S1222a (4 May 2022, Mw ∼ 4.7), which was recorded by the Very Broad Band sensors and associated channel ELYSE and is located 37.2° away from InSight. We use two different methods based on a point source approach for an elastic, horizontally layered medium to retrieve source parameters of S1222a. In the first case, the seismic moment tensor inversion of high-frequency seismogram data is calculated using a matrix method for the direct waves. The process includes the generation of records in displacement using the frequency-wavenumber integration technique. A method of inversion of the moment tensor of direct P- and S-waves, less sensitive to path effects than reflected and transformed waves, is presented, which significantly increases the accuracy and reliability of the method. In the second case, tensors were calculated using common low-frequency full-waveform inversion and the tests to verify the plausibility of this solution obtained from the single station calculation were performed and the uncertainty estimations for inversions can be useful in future research.
AB - The seismometer onboard InSight NASA Mars mission discovered a seismically active planet. We focused on the strongest event named S1222a (4 May 2022, Mw ∼ 4.7), which was recorded by the Very Broad Band sensors and associated channel ELYSE and is located 37.2° away from InSight. We use two different methods based on a point source approach for an elastic, horizontally layered medium to retrieve source parameters of S1222a. In the first case, the seismic moment tensor inversion of high-frequency seismogram data is calculated using a matrix method for the direct waves. The process includes the generation of records in displacement using the frequency-wavenumber integration technique. A method of inversion of the moment tensor of direct P- and S-waves, less sensitive to path effects than reflected and transformed waves, is presented, which significantly increases the accuracy and reliability of the method. In the second case, tensors were calculated using common low-frequency full-waveform inversion and the tests to verify the plausibility of this solution obtained from the single station calculation were performed and the uncertainty estimations for inversions can be useful in future research.
KW - direct waves
KW - focal mechanism
KW - full-waveform inversion
KW - marsquake
KW - matrix method
KW - seismic moment tensor
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U2 - 10.1029/2023EA003272
DO - 10.1029/2023EA003272
M3 - Article
AN - SCOPUS:85188526644
SN - 2333-5084
VL - 11
JO - Earth and Space Science
JF - Earth and Space Science
IS - 3
M1 - e2023EA003272
ER -