IMPERIAL COUNTY, CA — According to the U.S. Geological Survey, a preliminary 4.3 magnitude quake struck near Calipatria Friday morning.

The tremor, which hit the area at 2:55 a.m., was centered approximately 7 miles west-northwest of Calipatria. It occurred at 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 29 responses on its online form so far, from people saying they felt the quake. Light shaking was recorded, with reports from Imperial, Brawley and Calipatria among the cities where residents felt 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 past week

Over the last week, there have been four quakes of magnitude 2.5 or greater centered nearby. The largest, measuring 3.7, occurred 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