Even by Gulf of California’s standards, today was a busy day for seismicity. USGS reports that three magnitude 4+ events occurred near the mouth of the Gulf. The action started at 17:44 UTC with a M 5.9 event, it was followed up by 4.3 M and a 5.0 M events at 18:57 and 19:40 UTC. The three events were shallow, occurring from 10-12 km deep.
Location of 5.9 M event (26 July 2011) (Source: USGS)