The space agency gives much of the credit for the probable detection of the seismometer system in question. The seismic experiment for an internal structure has multiple insulation barriers designed to limit the influence of wind and weather changes, allowing it to record fine oscillations without having to move deep underground. The weaker events were captured using extremely sensitive sensors for a very wide range.
Researchers are still trying to point out the exact cause of the apparent Marshaw and expect to share more detailed results in the future. What is currently available is still remarkable, but implies that InSight quickly pays dividends, revealing aspects of Mars that were not available to earlier rovers.