A magnitude 4.2 earthquake shook a large swath of Southern California on Wednesday night time.
The earthquake, centered in San Bernardino, struck at 7:43 p.m. and resulted in gentle shaking throughout the Inland Empire, together with in Riverside, Fontana, Rialto, Rancho Cucamonga, Moreno Valley and Redlands, in accordance with the U.S. Geological Survey.
Gentle shaking is outlined by the Modified Mercalli Depth Scale as feeling like a heavy truck struck a constructing.
Colton obtained a shaking, at a few mile from the quake’s epicenter. Police, nonetheless, had not “obtained a single name” for help as of about 9 p.m., Sgt. Mike Farcas instructed The Occasions. The San Bernardino County Sheriff’s Division and police in Rialto, situated about two miles from the quake’s heart, echoed that assertion.
Weaker shaking was felt throughout the area, together with in Los Angeles, Lengthy Seashore and Orange County. Residents mentioned on social media shaking was felt in Ontario, Yorba Linda and downtown Los Angeles. A resident in Rowland Heights mentioned she felt three seconds of shaking, as if she have been on a ship with waves transferring quickly.
The epicenter was 1.5 miles southwest of downtown San Bernardino and half a mile north of the San Bernardino Depot practice station. The quake started simply east of the mapped traces of the San Jacinto fault, one of many area’s most energetic and probably harmful fault traces.
The San Jacinto fault spans about 130 miles and runs from the Cajon Go in San Bernardino County southeast towards the Mexican border. The San Jacinto fault is one which worries earthquake scientists as a result of it cuts into the center of the Inland Empire, via cities comparable to San Bernardino, Colton, Moreno Valley, Redlands, Loma Linda, Hemet and San Jacinto, in addition to close to Riverside, Rialto and Fontana.
The Inland Empire can also be notably weak to earthquakes due to an absence of seismic retrofitting. A Occasions investigation printed in 2018 mentioned there have been a whole lot of outdated brick buildings in additional than a dozen cities within the Inland Empire, together with Riverside, Pomona and San Bernardino, which were marked as harmful however remained unretrofitted regardless of many years of warnings.
On social media, seismologist Lucy Jones mentioned the depth of Wednesday’s earthquake — greater than 9 miles — was “fairly deep.” The most recent quake was about 15 miles southeast of 1 that shook the world on Jan. 5, when a magnitude 4.2 quake jolted near the distant group of Lytle Creek within the San Gabriel Mountains of San Bernardino County.
“The 2 quakes are in all probability on the identical fault, however they’re far sufficient aside in each time and area to not have an apparent correlation,” Jones wrote on social media.
Southern California’s first earthquake of at the very least magnitude 4 this 12 months occurred on New Yr’s Day, off the Los Angeles County coast. That magnitude 4.1 earthquake was centered about 10 miles southwest of San Pedro and 11 miles southeast of Rancho Palos Verdes.
A mean of 25 earthquakes with magnitudes of 4.0 to five.0 happen per 12 months in California and Nevada, in accordance with a latest three-year knowledge pattern.
Did you are feeling this earthquake? Take into account reporting what you felt to the USGS.
Discover out what to do earlier than, and through, an earthquake close to you by signing up for our Unshaken e-newsletter, which breaks down emergency preparedness into bite-sized steps over six weeks. Be taught extra about earthquake kits, which apps you want, Lucy Jones’ most vital recommendation and extra at latimes.com/Unshaken.
An earlier model of this story was routinely generated by Quakebot, a pc utility that displays the newest earthquakes detected by the USGS. A Occasions editor reviewed the submit earlier than it was printed. If you happen to’re interested by studying extra concerning the system, go to our listing of incessantly requested questions.