Seismic sources of InSight marsquakes and seismotectonic context of Elysium Planitia, Mars

Since early 2019, the InSight mission has proven that Mars is seismically active, with more than 900 seismic events recorded. Among them, several have characteristics close to terrestrial tectonic earthquakes. Most of these are located on major graben system Cerberus fossae and, a little further north, secondary Grjotá Valles. In this study, we invert moment tensors for nine marsquakes characterized by high quality data. Seven them fossae/Grjotá Valles and two near Martian dichotomy. The allow us interpret nature depth sources at origin events. our approach, P S body waveforms, PP, SS, PPP SSS phase maximum amplitudes look solutions surface waves weaker noise. From results tensors, determine all been triggered moderate depths 15–36 km. We deduce seven geometries similar fractures generated tectonics. This activity supposed result from reactivation previous faults fractures, which would initially induced propagation volcanic dikes depth. dichotomy due deep compressive fracturing lowlands. They therefore planetary thermal contraction. Our in strong agreement recent studies event calculated