Magnitude 3.9 Earthquake in Riverside County, California.

The United States Geological Survey recorded a Magnitude 3.9 Earthquake at a depth of about 14.0 km roughly 23 km to the southeast of Azna in Riverside County, California, slightly before 7.200 pm local time on Wednesday 12 January 2022 (slightly before 3.20 am on Thursday 13 January GMT). There are no reports of any damage or injuries relating to this quake, but people have reported feeling it across much of southern California.

 

The approximate location of the 12 January 2022 Riverside County Earthquake. USGS.

California is extremely prone to Earthquakes due to the presence of the San Andreas Fault, a tectonic plate margin that effectively bisects the state. The west of California, including Santa Barbara and Los Angeles, is located on the Pacific Plate, and is moving to the northwest. The east of California, including Fresno and Bakersfield is on the North American Plate, and is moving to the southeast. The plates do not move smoothly past one-another, but constantly stick together then break apart as the pressure builds up. This has led to a network of smaller faults that criss-cross the state, so that Earthquakes can effectively occur anywhere.

 

Tectonic boundaries and faults in California and the surrounding area. USGS.

Witness accounts of Earthquakes can help geologists to understand these events and the underlying structures that cause them. If you felt this quake (or if you were in the area but did not, which is also useful information) then you can report it to the United States Geological Survey here.

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Magnitude 3.7 Earthquake in Riverside County, California.

The United States Geological Survey recorded a Magnitude 3.7 Earthquake at a depth of about 3.1 km roughly 6 km to the southwest of Aguanga in Riverside County, California, slightly after 9.40 pm local time on Friday 4 December 2020 (slightly after 5.40 am on Saturday 5 December GMT). There are no reports of any damage or injuries relating to this quake, but people have reported feeling it across much of southern California.

 

The approximate location of the 4 December 2020 Riverside County Earthquake. USGS.

California is extremely prone to Earthquakes due to the presence of the San Andreas Fault, a tectonic plate margin that effectively bisects the state. The west of California, including Santa Barbara and Los Angeles, is located on the Pacific Plate, and is moving to the northwest. The east of California, including Fresno and Bakersfield is on the North American Plate, and is moving to the southeast. The plates do not move smoothly past one-another, but constantly stick together then break apart as the pressure builds up. This has led to a network of smaller faults that criss-cross the state, so that Earthquakes can effectively occur anywhere.

Tectonic boundaries and faults in California and the surrounding area. USGS.

Witness accounts of Earthquakes can help geologists to understand these events and the underlying structures that cause them. If you felt this quake (or if you were in the area but did not, which is also useful information) then you can report it to the United States Geological Survey here.

 

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Magnitude 3.6 Earthquake in Riverside County, California.

The United States Geological Survey recorded a Magnitude 3.6 Earthquake at a depth of 19.6 km  in the San Jacinto Mountains in Riverside County, California, slightly before 3.45 pm local time (slightly before 11.45 pm GMT) on Monday 30 December 2013. There are no reports of any damage or injuries associated with this event, though people reported feeling it as far away as San Diego, slightly over 100 km to the southwest.

The approximate location of the 30 December 2013 Riverside County Earthquake. Google Maps.

California is extremely prone to Earthquakes due to the presence of the San Andreas Fault, a tectonic plate margin that effectively bisects the state. The west of California, including Santa Barbara and Los Angeles, is located on the Pacific Plate, and is moving to the northwest. The east of California, including Fresno and Bakersfield is on the North American Plate, and is moving to the southeast. The plates do not move smoothly past one-another, but constantly stick together then break apart as the pressure builds up. This has led to a network of smaller faults that criss-cross the state, so that Earthquakes can effectively occur anywhere.

Witness accounts of Earthquakes can help geologists to understand these events and the underlying structures that cause them. If you felt this quake (or if you were in the area but did not, which is also useful information) then you can report it to the United States Geological Survey here.

See also Magnitude 4.3 Earthquake in San Bernardino County, California, Magnitude 3.0 Earthquake in Orange County, California, Magnitude 2.5 Earthquake on the San Diego/Riverside County boundary, southern California, Two Earthquakes in Riverside County, southern California and Magnitude 2.5 Earthquake in San Bernardino County, California.

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Magnitude 2.5 Earthquake on the San Diego/Riverside County boundary, southern California.

The United States Geological Survey recorded a Magnitude 2.5 Earthquake at a depth of 8.5 km on the boundary between San Diego and Riverside Counties slightly before 9.40 am local time (slightly before  4.40 pm GMT) on Thursday 26 September 2013. This is not a large quake, and is unlikely to have caused any damage or injuries, but is likely to have been felt locally.

The approximate location of the 26 September 2013 San Diego/Riverside County boundary Earthquake. Google Maps.

California is extremely prone to Earthquakes due to the presence of the San Andreas Fault, a tectonic plate margin that effectively bisects the state. The west of California, including Santa Barbara and Los Angeles, is located on the Pacific Plate, and is moving to the northwest. The east of California, including Fresno and Bakersfield is on the North American Plate, and is moving to the southeast. The plates do not move smoothly past one-another, but constantly stick together then break apart as the pressure builds up. This has led to a network of smaller faults that criss-cross the state, so that Earthquakes can effectively occur anywhere.

Witness accounts of Earthquakes can help geologists to understand these events and the underlying structures that cause them. If you felt this quake (or if you were in the area but did not, which is also useful information) then you can report it to the United States Geological Survey here.

See also Magnitude 2.8 Earthquake in San Benito County, California, Two Earthquakes in Riverside County, southern California, Magnitude 2.6 Earthquake in Kern County, California, Magnitude 2.5 Earthquake in San Bernardino County, California and Magnitude 3.6 Earthquake in Inyo County, northern California.

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Two Earthquakes in Riverside County, southern California.

The United States Geological Survey recorded a Magnitude 3.5 Earthquake at a depth of 12.6 km, south of the community of Anza in Riverside County, California, at about 6.10 am local time (about 1.10 pm GMT) on Sunday 22 September 2013. This was followed by a second quake at roughly the same spot eight minutes later. Neither of these quakes was large enough to present any danger, though they were felt over a large area of southern California.

The approximate location of the 22 September 2013 Anza Earthquakes. Google Maps.

California is extremely prone to Earthquakes due to the presence of the San Andreas Fault, a tectonic plate margin that effectively bisects the state. The west of California, including Santa Barbara and Los Angeles, is located on the Pacific Plate, and is moving to the northwest. The east of California, including Fresno and Bakersfield is on the North American Plate, and is moving to the southeast. The plates do not move smoothly past one-another, but constantly stick together then break apart as the pressure builds up. This has led to a network of smaller faults that criss-cross the state, so that Earthquakes can effectively occur anywhere.

Witness accounts of Earthquakes can help geologists to understand these events and the underlying structures that cause them. If you felt this quake (or if you were in the area but did not, which is also useful information) then you can report it to the United States Geological Survey here (for the first quake) or here (for the second quake).

See also Magnitude 2.6 Earthquake in Kern County, California, Magnitude 2.5 Earthquake in San Bernardino County, California, Magnitude 3.1 Earthquake to the north of the Gulf of California, Magnitude 3.2 Earthquake in southern California and Magnitude 4.3 Earthquake hits Kern County, California.

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