Today was another good day.  We had strong storms in the morning that subsided by lunchtime.  Later in the day we started to see some very interesting shallow features with the Chirp.  Strong reflectors from shallow units (~60 ft below the riverbed) were bent and broken.  This represents recent activity, but how recent (100s of years to 10,000s of years) we do not presently know.  The younger the units are the more recent the deformation and greater the impact.

What is interesting is that we are in very close proximity to a large, inland liquefaction field previously identified by Randy Cox.  Are the two related?  The amount of deformation and offset on these shallow units is rather large suggesting a large seismogenic source (earthquake fault) nearby, but where?