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RIVERSIDE - A magnitude 4.4 earthquake hit the Imperial Valley today at 9:42, and at least 17 other quakes larger than magnitude 3 range rattled the area today, automated seismographs report.
Kathy Svitil, a spokeswoman at Caltech, said the increased seismic activity was reviewed by scientists, who pronounced them a normal part of the expected aftershock sequence following the magnitude 7.2 Easter Sunday quake near Mexicali.
The epicenters for today's quake cluster generally were on the U.S.-Mexico border about 11 miles west of downtown Calexico. The largest quake's epicenter was placed 14 miles southeast of Calexico by computer algorithms, but
Svitil said scientists reviewed seismographic data and determined it was actually on the fault west of Calexico and Mexicali.
Scientists have said that automatic plotting of exact epicenters south of the border is not always exact, because there is no real-time seismographic data flow from there.
Today's quake swarm is generally at the northern end of the Laguna Salada Fault, which extends from the Imperial Valley town of Seeley, west of El Centro, to the southeast, towards the Mexican resort town of San Felipe. Last Sunday's 7.2 earthquake, which killed two people in Mexicali and did $100 million in damage in California, was centered on that fault about 31 miles south of the border.
A magnitude 4.5 quake early Saturday morning at the northern end of the Laguna Salada Fault woke up people in San Diego, the Palm Springs area and southern Orange County, according to reports filed with the USGS.
Stivil said today's earthquake cluster is not related to a computer glitch Saturday that caused a flood of false reports of seismic activity to be relayed by the California Integrated Seismic Network.
INDIO - A magnitude 4.4 earthquake hit the Imperial Valley today at 9:42, and six quakes in the magnitude 3 range rattled the area in a three-hour period today, automated seismographs report.
A magnitude 4.5 quake early Saturday morning at the northern end of the Laguna Salada Fault woke up people in the Coachella Valley, southern Orange County and San Diego, according to reports filed with the USGS.
Kathy Svitil, a spokeswoman at Caltech, said the increased seismic activity was reviewed by scientists, who pronounced them a normal part of the expected aftershock sequence following the magnitude 7.2 Easter Sunday quake near Mexicali.
The epicenters for today's quake cluster generally were on the U.S.-Mexico border about 11 miles west of downtown Calexico. The largest quake's epicenter was placed 14 miles southeast of Calexico by computer algorithms, but Svitil said scientists reviewed seismographic data and determined it was actually on the fault west of Calexico and Mexicali.
Scientists have said that automatic plotting of exact epicenters south of the border is not always exact, because there is no real-time seismographic data flow from there.
Today's quake swarm is generally at the northern end of the Laguna Salada Fault, which extends from the Imperial Valley town of Seeley, west of El Centro, to the southeast, towards the Mexican resort town of San Felipe. Last Sunday's 7.2 earthquake, which killed two people in Mexicali and did $100 million in damage in California, was centered on that fault about 31 miles south of the border.
Stivil said today's earthquake cluster is not related to a computer glitch Saturday that caused a flood of false reports of seismic activity to be relayed by the California Integrated Seismic Network.
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