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 at 2:55 a.m., with its epicenter located approximately 7 miles west-northwest of Calipatria and a depth of 7 miles.

Did you feel it?

Those who experienced 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 felt the quake. According to the USGS DYFI report, light shaking was recorded and residents in multiple cities—including Imperial, Brawley and Calipatria—reported experiencing 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.

Quakes last week

During the past week, the area has experienced four quakes with a magnitude 2.5 or above. The biggest, a 3.7 magnitude earthquake, 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