Sat, 20 Mar 2021, 23:09
23:09 PM | BY: EARTHQUAKEMONITOR
3.1 quake 20 Mar 3:49 pm (GMT -7)
A very shallow magnitude 3.1 earthquake was reported early afternoon near Ontario, San Bernardino County, California, USA.
According to the United States Geological Survey, the quake hit on Saturday 20 March 2021 at 3:49 pm local time at a very shallow depth of 2.9 miles. Shallow earthquakes are felt more strongly than deeper ones as they are closer to the surface. The exact magnitude, epicenter, and depth of the quake might be revised within the next few hours or minutes as seismologists review data and refine their calculations, or as other agencies issue their report.
A second report was later issued by the European-Mediterranean Seismological Centre (EMSC), which listed it as a magnitude 2.9 earthquake.
Based on the preliminary seismic data, the quake should not have caused any significant damage, but was probably felt by many people as light vibration in the area of the epicenter.
Weak shaking might have been felt in Ontario (pop. 171,200) located 3 miles from the epicenter, Rancho Cucamonga (pop. 175,200) 5 miles away, Upland (pop. 76,400) 5 miles away, and Chino (pop. 85,600) 5 miles away.
Other towns or cities near the epicenter where the quake might have been felt as very weak shaking include Eastvale (pop. 59,000) located 6 miles from the epicenter, Pomona (pop. 153,300) 8 miles away, Chino Hills (pop. 78,300) 9 miles away, and Fontana (pop. 207,500) 10 miles away. In Los Angeles (pop. 3,971,900, 37 miles away), the quake was probably not felt.
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Date & time: 20 Mar 2021 3:49 pm (GMT -7) local time (20 Mar 2021 22:49 GMT)
Depth: 4.7 km
Epicenter latitude / longitude: 34.04°N / 117.61°W (San Bernardino Comitatus County, California, United States)
Primary data source: USGS