IMPERIAL COUNTY, CA — A preliminary 4.3 magnitude quake was registered near Calipatria Friday morning, the U.S. Geological Survey reported.

The tremor, which struck the area at 2:55 a.m., was centered about 7 miles west-northwest of Calipatria. It occurred at a depth of 7 miles.

Did you feel it?

If you felt the earthquake, you can report it via the USGS Felt Report form. So far, the agency has collected 29 online responses from individuals indicating that they experienced the quake. The USGS DYFI report indicates that people in cities such as Imperial, Brawley and Calipatria experienced light shaking during the tremor.

Impact and estimated losses

Green alert for shaking-related fatalities and economic losses. There is a low likelihood of casualties and damage. Recent earthquakes in this area have caused secondary hazards such as landslides and liquefaction that might have contributed to losses.

Structure information summary
Overall, the population in this region resides in structures that are resistant to earthquake shaking, though vulnerable structures exist. The predominant vulnerable building types are unreinforced brick masonry and reinforced masonry construction.

Historical information
A magnitude 6.6 earthquake 315 km northwest of this event struck San Fernando, California on February 9, 1971 (UTC), with estimated population exposures of 319,000 at intensity VIII and 21,000 at intensity IX or greater, resulting in a reported 65 fatalities.

Earthquakes past week

Last week, the region has experienced four quakes with a magnitude 2.5 or above. The biggest, a 3.7 magnitude quake, was detected near Borrego Springs prior to this quake.

The four largest earthquakes nearby in the last week:

• 3.7, west of Borrego Springs on July 10
• 3.3, west-northwest of Calipatria on July 11
• 3.0, west-northwest of Calipatria on July 11
• 2.5, northwest of Progreso, B.C. on July 4

Source: The U.S. Geological Survey