Mw5.8 Baja California Earthquake
10:48AM December 30, 2009
A Mw5.8 earthquake occurred at 10:48AM near the US/Mexico border, 22 miles SE of Calexico, CA, in northern Baja CA, Mexico. The event was felt widely throughout Southern California and northern Baja, and felt as far away as Arizona.
Report by the California Integrated Seismic Network (Caltech/USGS)
Ken Hudnut, USGS
A magnitude 5.8 earthquake struck southeast of Mexicali, Mexico, about 35 km south of the US-Mexico border, at 10:48 a.m. Pacific time (PST); it was widely felt in Mexico, southern California and southwest Arizona. Location: 32.467°N, 115.195°W
ShakeMap showing peak MMI VIII near the epicenter and MMI VI at El Centro
The earthquake likely involved motion along a zone of faults distinct from, but running parallel to, the San Andreas fault. These faults accommodate right-lateral motion of the Pacific Plate, which moves northwestwards relative to the North American plate. Earthquakes with up to M 6 have happened historically in this vicinity, but most recent earthquake activity is slightly farther to the southwest near Cerro Prieto. This event appears to have occurred along a southeastward projection of the Imperial fault, slightly northeast of Cerro Prieto and within the Colorado River delta.
SCSN Moment Tensor Solution
No unusual earthquake activity has been observed to the north of the US-Mexico border yet in association with this activity.
Felt reports as reported by CIIM (Community Internet Intensity Map - Did You Feel It?).
Links to additional information:
CICESE, Ensenada, Mexico: