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

The tremor struck the area at 2:55 a.m. It occurred at a depth of 7 miles with the epicenter located approximately 7 miles west-northwest of Calipatria.

Did you feel it?

Those who noticed the earthquake are encouraged to report it via the USGS Felt Report form. The agency has received 30 responses on its online form so far, from people indicating they experienced the quake. Light shaking was detected, with reports from Imperial, Brawley and Calipatria among the cities where residents experienced the tremor, according to the USGS DYFI report.

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 last week

In the past week, four quakes of magnitude 2.5 or higher have been registered in the region. The strongest, a 3.7 magnitude quake, jolted 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