MODELED SEISMIC EFFECTS OF RECENT METEOROID IMPACTS ON MARS: PREDICTIONS FOR THE INSIGHT LANDER
We use a detailed characterization of crater morphometry and spatial information for new, dated impacts to investigate recent impact-produced seismic activity on Mars. New imaging with the High Resolution Imaging Science Experiment (HiRISE) camera on Mars Reconnaissance Orbiter conducted for the mission landing site selection process has revealed multiple impacts features that were not visible in images collected prior to 2008. For example, a new 5.81 m diameter crater (4.290° N; 135.260° E) that is surrounded by a ~150 m blast zone with significant dust removal was identified using HiRISE images. This impact feature is located within two of the landing ellipses being considered for InSight .
For a range of target properties (bedrock vs. regolith), we calculate that this recent impact would have produced a seismic event with a magnitude between 0.5 to 2.1 Mw, a moment release well within the detectability of the nearby InSight SEIS instrument. The resulting seismic amplitudes for this and similar impacts allow us to quantify the detectable distances for body and surface wave phases and also to implement techniques to recover Martian internal structure from a single 3-component seismometer.