A team of ETH researchers recently published results in Nature Communications that used passive seismic recordings from NASA's InSight probe to yield interpretations of the Martian outer crust. Their paper at https://lnkd.in/gRVbS_t3 is titled "The shallow structure of Mars at the InSight landing site from inversion of ambient vibrations".

Those working with passive seismic data on Earth are of course already well versed with a variety of imaging methods that largely exploit various surface wave modes of seismic wavefields.

Stian Hegna from PGS also recently showed how to yield useful seismic reflection images using only seismic vessel 'noise' in his paper titled "Continuous Wavefields Method – The acoustic wavefield generated by the seismic vessel" at https://lnkd.in/gnStqdGm. Interesting times.