Marsquakes aren’t useful for sorting out local features. If their seismic waves arrive from far enough away, then their behavior is mostly influenced by the materials they spent most of their time traveling through. If the marsquake happens nearby, then things are too energetic to make out the fine details caused by local features. So, in order to look at the local geology, you need to look at the background seismic noise that’s constantly being picked up by InSight.
Scientists use seismic noise to image first hundred meters of Mars from Ars Technica
I recently learned about the effects of wind and waves on sensitive seismometers from smart people watching the Iceland volcano and trying to understand the various seismic charts in the chat. This is a neat technique using that “noise” in a productive way.