Sunday around 6:44 a.m., a 3.8 magnitude earthquake shook the ground 31 miles outside of Chico — which was followed by a smaller 3.2 magnitude tremor south of Gilroy at 11:05 a.m. this morning.

According to a recently released map and study conducted by the USGS (United States Geological Survey), East Bay and San Jose are far more susceptible to damaging seismic shake-ups than previously thought, not made better by the fact that those areas are, apparently, sitting on sand.