Magnitude 4.1 earthquake rattles Corona, California

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An earthquake was broadly felt throughout the Los Angeles space. We offer a fast abstract of what occurred.
 

By Temblor Workforce Members (@temblor)
 

At 1:49 p.m. native time on the afternoon of Wednesday, Might 1, a magnitude 4.1 earthquake shook components of the Los Angeles Space, together with the cities of Corona, Anaheim, and Santa Ana. The epicenter was within the Santa Ana mountains only a few miles southwest of Corona. Due to the inhabitants density of the Los Angeles area, the earthquake was broadly felt, though it precipitated little injury.

The broader area has skilled quite a few small shocks previously month (Determine 1). Wednesday’s quake struck near the Elsinore fault, close to the junction of the Glen Ivy (southeast), Whittier (northwest), and Chino (north) fault sections.
 

ShakeAlert

The earthquake triggered the ShakeAlert Earthquake Early Warning System, which is at the moment operational in California, Oregon, and Washington. Although the quake was finally decided to be magnitude 4.1 after human overview, the automated ShakeAlert system estimated it as excessive as magnitude 4.5. That will not appear to be a big distinction, however a magnitude of 4.5 is the minimal threshold an earthquake has to achieve to ensure that alerting to happen on cell telephones. Anybody inside the octagon labeled MMI 3 in Determine 2 – in different phrases, gentle shaking on the Modified Mercalli Depth scale – who had beforehand downloaded a ShakeAlert-powered app (like MyShake) is more likely to have obtained an alert. As well as, anybody with an Android telephone inside that octagon ought to have obtained a push notification letting them know that there was a small earthquake close by.
 

Folks receiving a warning from ShakeAlert doubtless would have had not more than a few seconds. Folks nearer to the epicenter – of us within the metropolis of Corona, for instance – wouldn’t have obtained alerts till after they felt shaking. That is referred to as the late alert zone (previously known as the blind zone). Usually, warning instances are longer for bigger earthquakes that influence a broader area.

The Wi-fi Emergency Alert (WEA) system is just triggered for earthquakes of magnitude 5 and bigger, so no WEA messages had been despatched for this earthquake.

In case you’re within the area and also you felt this earthquake, let the USGS know. And don’t neglect that if you happen to really feel shaking, the USGS recommends that you simply drop, cowl and maintain on.
 
 

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Alka Tripathy-Lang is a contract science author based mostly in Chandler, Arizona, and holds a Ph.D. in geoscience.

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