Overview
- The quake sequence, which began Saturday near Brawley, continued into early Sunday with dozens of small shocks.
- USGS lists the largest quake at magnitude 4.5, though some outlets cited a 4.7 just after midnight from early readings.
- USGS logged at least 18 quakes of 2.5 or higher, while Caltech counted about 130 events on Saturday including very small ones.
- Most quakes were shallow at roughly 5 to 10 miles deep in the Brawley Fault Zone that links the Imperial and San Andreas faults and often produces swarms.
- Officials reported no injuries or major damage and said they are monitoring the sequence as USGS ShakeAlert sent alerts to nearby phones.