IMPERIAL COUNTY, CA — the U.S. Geological Survey reported that a preliminary 4.3 magnitude quake occurred near Calipatria Friday morning.

At 2:55 a.m., the region was struck by a tremor. The earthquake rattled at a depth of 7 miles, with its epicenter about 7 miles west-northwest of Calipatria.

Did you feel it?

If you experienced the quake, you can share your observations using the USGS Felt Report form. The agency has so far received 30 reports via its online form from people who indicate they experienced the tremor. Light shaking has been registered and people reported experiencing the earthquake in multiple cities, including Imperial, Brawley and Calipatria 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.

Quakes last week

Over the last week, there have been four quakes with a 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