3.7 Magnitude Quake Rattles Indio, Inland Empire Following Overnight 4.9 Temblor

INDIO, CA — Aftershocks continue to rattle the Inland Empire following a 4.9 magnitude earthquake Monday evening.

At 8:20 a.m. Monday, a magnitude 3.7 quake struck near Indio — one of several aftershocks in the wake of the original temblor, according to the USGS.

That earthquake, which struck just before 6 p.m. Monday was centered about 12 miles northeast of Indio, according to the U.S. Geological Survey, was felt across Southern California when it struck with a rapid jolt and cell-phone alarms blaring right before it arrived. Millions of cell phone users received an alert seconds before the earthquake hit.

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There were no immediate reports of injuries or damage on Tuesday, nor on Monday.

"At this time, the city of Indio has no reports of injuries and no immediate reports of any visible road damage related to this evening's earthquake. Our water system is secure and stable," a city spokesperson said in a statement Monday.

Since then, residents have taken to social media to share their experiences, mostly about the alarm, which has drawn the attention of those who have signed up for California's My Shake alerts.

According to Caltech's seismology lab, the ShakeAlert system was activated, and alerts were sent to cell phones via apps and the WEA system across southern California.

At least five of the aftershocks have reached magnitude 3.0 in and around the Indio area, according to the USGS.

Monday's quake was initially estimated a magnitude 5.1, but was later downgraded to 4.9 magnitude, according to the USGS and California Integrated Seismic Network Caltech Seismologist Gabrielle Tepp.

"As of Monday, there have been 207 aftershocks recorded, the largest was of 3.7 magnitude, and the smallest was .5 magnitude," she said. "More aftershocks can be expected in the next few days; the largest expected is approximately one magnitude unit smaller than the main shock."

According to Tepp, there is a small chance of a larger quake, but that chance decreases over time.

"Since our records began in 1932, we've had 44 events of magnitude 4 or greater within 10 kilometers of the Indio event, she said. Until Monday, the largest of those was 4.2, which occurred on July 22, 2019.

This incident most likely is due to the Blue Cut Fault, according to Caltech estimates.

Nearby fault zones include the Indio Hills fault zone (6.6 km), the Berdoo Canyon fault zone (8.1 km), an unnamed Fault in the Little San Bernardino Mountains (11.3 km), the San Andreas fault zone, the San Bernardino Mountains section (North Branch SAF) (12.3 km), the San Andreas fault zone, Coachella section (13.2 km) and the San Andreas fault zone, San Bernardino Mountains section (South Branch SAF) (13.6 km).

Did you feel one or more of the quakes in the past 24 hours?

If you'd like to provide feedback about your experience during the earthquake as well as with receiving the EEW system, please fill out a "Did You Feel It?" report at earthquake.usgs.gov/earthquakes/eventpage/ci41162719/tellus.

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