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Earthquake on California-Mexico border: how big was the tremor and where was the epicenter?

Residents in San Diego and across Southern California reported buildings shaking after the tremor that hit at 11.43 p.m. Pacific Time. No injuries have been reported.

Earthquake in California

The earthquake that hit the California - Mexico border some 100km inland from San Diego late last night, Thursday, at 11.43 p.m. PT was a 4.8 magnitude tremor according to the US Geological Survey. That is equivalent to just under 200 tons of TNT being exploded.

The quake occurred at a depth of six miles (9.6 km.) The epicentre was recorded as being 7 miles east of the sparsely populated census-designated place Ocotillo.

No damage or injuries have been reported at the time of publication.

Ocotillo quake felt across much of Southern California

The quake was felt across much of Southern California and into Baja California, with reports of buildings shaking coming from people in San Diego, along with San Ysido, Carmel Valley, Kearney Mesa, North Park and Chula Vista.

You can record your own report of the earthquake with the USGS.

Ocotillo aftershocks

The USGS has recorded one 2.6 magnitude aftershock from the initial quake. This was recorded 17 minutes after the initial tremor.

Earthquakes in California

According to the California government the state has over 500 active faults including the major San Andreas fault. Most Californians live with 30 miles of active fault .

You can get the Earthquake Warning California app to give your crucial seconds to take cover in the event of an earthquake and before you feel shaking.