A flurry of earthquakes have been occurring east of San Diego in Southern California this afternoon, with several quakes above 4.0-magnitude reported.
While much seismic activity has been occuring in the area in the 2.0- to 3.9-magnitude range, the U.S. Geological Survey reported that a 4.4-magnitude quake that hit at 4:31 p.m. today (September 30) at a depth of only seven kilometres (four miles)
The epicentre was located three kilometres (two miles) northeast of Westmorland, California; 29 kilometres (18 miles) north of El Centro, California; 49 kilometres (31 miles) northwest of Mexicali, Mexico; and 123 kilometres (76 miles) southeast of Palm Springs.
After that, another larger temblor followed at 5:31 p.m.
Although this one was initially reported as a 4.6-magnitude quake based on preliminary measurements, it was reassessed as a 4.9-magnitude quake.
At a depth of 11 kilometres (seven miles), the epicentre was located four kilometres (two miles) northeast of Westmorland, California; 30 kilometres (18 miles) north of El Centro, California; 50 kilometres (31 miles) northwest of of Mexicali, Mexico; 122 kilometres (76 miles) southeast of Palm Springs; and 148 kilometres (92 miles) northeast of San Diego.
Then a third quake hit, reported as 4.2-magnitude based on preliminary measurements, at 5:41 p.m. with an epicentre, at a depth of 10 kilometres (six miles), in the same area.
On September 18, a 4.6-magnitude quake—with an epicentre in Rosemead, California—shook the Greater Los Angeles area.