| Abstract Submission No. | ABS-3.1-0166 |
| Title of Abstract | Crustal Imaging of Mars from Insight SEIS |
| Authors | Prathmesh Tari*, Mala S. Bagiya, A. Manikho Rajina, Satish Maurya, Priyeshu Srivastava, A. P. Dimri |
| Organisation | Indian Institute of Geomagnetism, Navi Mumbai |
| Address | Indian Institute of Geomagnetism Navi Mumbai, Maharashtra, India Pincode: 410218 E-mail: prathmeshtari@gmail.com |
| Country | India |
| Presentation | Oral |
| Abstract | Mars shares geological similarities with Earth despite lacking active plate tectonics, and seismic activity is expressed through marsquakes. NASA¿s InSight mission deployed the SEIS instrument, comprising Very Broadband (VBB) and Short Period (SP) seismometers in UVW coordinates, which recorded 1,319 events (Lognonné et al., 2023). High signal-to-noise events were analyzed for the P Receiver Function (P-RF) method in which out of 26 events, in 15 events glitch is identified and removed for further analysis to constrain the martian crustal structure. In the P-Receiver Function (P-RF) approach, three-component seismic data (UVW) are first rotated into ZRT components (vertical, radial, transverse). A time-domain iterative deconvolution with a Gaussian width of 2 is then applied to remove source and path effects and isolate the receiver-side response. This enhance the quality of P-to-S converted phases, which are used to estimate crustal structure beneath the station. Further enhance the quality of the P-RFs, we applied Principal Component Analysis (PCA) for noise reduction and waveform consistency. Additionally, to improve inversion performance at depth, we computed apparent shear-wave velocity and carried out a joint inversion of P-RFs and apparent shear velocity. The results provide new insights into the upper-crustal structure of Mars beneath the InSight SEIS station, and detailed inversion outcomes will be presented. |
| Keywords | Mars, Marsquake, Insight SEIS, P Receiver Function, Inversion |