Another seismologist re-examined the event following the 2014 South Napa earthquake and found that the heavy effects on Mare Island were the result of weak or deficient buildings . Comparing the intensity distribution of the two shocks revealed that it was indeed severe on Mare Island as it was likely close to the rupture , which may have involved both strands of the Franklin Fault ( between the West Napa and Rogers Creek Faults ) . Although surface rupturing events have been documented on the Hayward – Rogers Creek Fault System just to the west , no surface rupture was associated with this earthquake . A magnitude range of 5.8 – 6.4 was given , with the lower bound representing an average stress drop event and the higher bound for a lower stress drop event
2014 South Napa earthquake
2014 South Napa earthquake
1898 Mare Island earthquake