Earthquake Magnitude 6.4 Near China Lake and Ridgecrest in Southern California


A 6.4 magnitude earthquake struck Southern California on Thursday July 4, 2019 at about 10:33 a.m. PT. The area where the earthquake struck is a relatively uninhabited area near China Lake and Ridgecrest — east of the Sequoia National Forest. However, about 24 emergency calls for help from Kern County firefighters in China Lake and Ridgecrest have been reported shortly after the earthquake. Some of the calls have included structure fires.

USGS | M 6.4 – 10km ENE of Ridgecrest, CA | 2019-07-04 17:35:01 (UTC)35.643°N 117.564°W4.8 km depth

Ridgecrest is a city with a population of about 29,000 in Kern County. Ridgecrest is popular with skiers and snowboarders headed from Los Angeles.

China Lake is an unincorporated community in Kern County, California, located 2.5 miles north-northeast of Ridgecrest, and further from the epicenter than Ridgecrest. China Lake is a dry lake and is also the location of the Naval Air Weapons Station China Lake, which is the Navy’s largest land holding facility of weapons and armaments research, development, acquisition, testing and evaluation.

The earthquake is the largest earthquake to hit southern California since the 1990s. There have been several aftershocks reported of about Magnitude 3. A Magnitude 5 aftershock is likely, and it is a 5% chance that the 10:33 a.m. is not the strongest earthquake in this sequence. Previous earthquakes in this area have continued with aftershocks for up to 6 months.

A foreshock of Magnitude 4.2 earthquake was reported at 10:02 a.m. PT Thursday July 4, 2019 six miles from Ridgecrest, Calif., according to the U.S. Geological Survey.

The earthquake occurred 30 miles from California City, 59 miles from Barstow, 63 miles from Tehachapi and 65 miles from Rosamond.

The earthquake was felt widely throughout the Los Angeles area, according to Caltech seismologist Egill Hauksson. Although shaking was felt in Los Angeles, significant damage is unlikely. In the Los Angeles area, the quake was slow and steady, lasting about 30 seconds. China Lake area aftershocks are not likely to be felt in the Los Angeles area.

The earthquake was also felt in Las Vegas and Santa Barbara.

Media were briefed by CalTech Seismologist Lucy Jones within an hour after the earthquake.

Additional Location Reference …
The 10:33 a.m. quake was centered in the Searles Valley, a remote area of Kern County about 100 miles from Los Angeles.

The earthquake was centered 10 miles northeast of Ridgecrest, California.

The earthquake was located about 90 miles northeast of Bakersfield

The earthquake was located about 125 miles north of Los Angeles.



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