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Southern California Earthquake Data Center

Earthquake Information

2002 Monthly Seismicity




January 2002 MAP GRAPH
    The two largest earthquakes in southern California during January 2002 both had a magnitude of 4.2; each is at least partially visible on the summary map. The former of these two events occurred in the Ocotillo Wells area in the early morning hours on the 2nd of the month. The latter was located between Valencia and Simi Valley, and occurred the night of the 28th, followed quickly by quakes of magnitudes 3.9 and 3.8. The aftershocks from these earthquakes, combined with the normal background seismicity, lifted the overall earthquake count in southern California to 1088 earthquakes this month -- not a notably high number, but a definite increase from the total for December 2001. A swarm of earthquakes in northern Mexico (easily visible) also added to the count.

February 2002 MAP GRAPH
    The Southern California Seismic Network recorded & analyzed 1,350 earthquakes in February 2002. 479 of these were M2.0 & larger, 48 were M3.0 & larger, three were M4.0 & larger, one was M5.0 & larger. Most of relatively large number of earthquakes this month were foreshocks & aftershocks of a ML5.7 on February 22, in Mexico 26 miles south-southeast of Calexico. This earthquake was felt as far away as Lancaster. It generated 3,521 felt reports from 304 zip codes. The peak intensity in the U.S. was in the Imperial Valley: up to Modified Mercalli V. North of the U.S./Mexico border, the seismicity totals were: 889 total, 139 M2.0 & larger, nine M3.0 & larger, none above M4.0. The largest & most widely-felt earthquake on this list was a ML3.6 on February 3, located 10 miles east-southeast of Julian. It prompted 927 felt reports from 100 zip codes between San Diego, Redlands & Palm Springs, with a peak intensity of Modified Mercalli IV. There was also a ML3.4 on February 6, located 7 miles east of Mt. San Gorgonio, which did not get much public attention. On February 20, a ML2.5 near Baldwin Hills prompted 135 felt reports ranging from Beverly Hills to Torrance.

March 2002 MAP GRAPH
    The Southern California Seismic Network recorded & analyzed 962 earthquakes in March 2002. 224 of these were M2.0 & larger, 23 were M3.0 & larger, one was M4.0 & larger. The month~Rs largest earthquake was a ML4.6 on March 16, located offshore 20 miles northwest of Santa Barbara Island. It was widely felt, generating 1,169 felt reports from 238 zip codes from Ventura to Palmdale to San Clemente. The second largest earthquake of the month was a ML3.8 on March 30, located 2 miles east-northeast of Mesa Grande in the Anza-Borrego region. This earthquake was also widely felt, generating 1,128 felt reports ranging from San Diego to the Big Bear area. The peak intensity was Modified Mercalli IV in & around Santa Ysabel. A smaller earthquake, ML3.2 occurred on March 16, located near Placentia. It generated 658 felt reports from 95 zip codes, indicating a peak intensity of IV in the epicentral area.

April 2002 MAP GRAPH
    The Southern California Seismic Network recorded & analyzed 664 earthquakes in April 2002. 111 of these were M2.0 & larger, six were M3.0 & larger, two were M4.0 & larger. The month~Rs largest earthquake was a ML4.4 on April 5, located 27 miles north of Joshua Tree or 16 miles south-southwest of Ludlow. It was reported felt in San Bernardino, Joshua Tree, Yucca Valley, Desert Hot Springs & Indio. This earthquake was a Hector Mines aftershock. The second largest quake was a ML4.1 on April 29, located in Mexico 49 miles south-southwest of Yuma AZ.

May 2002 MAP GRAPH
    The Southern California Seismic Network recorded & analyzed 943 earthquakes in May 2002. 112 of these were M2.0 & larger, eight were M3.0 & larger, one was M4.0 & larger. The largest earthquake of the month was a ML4.0 on May 22, located in Mexico 59 miles south-southwest of Calexico. Also notable was a ML3.9 on May 21, located 8 miles south of Salton City, west of the Imperial Valley. It was felt as far away as Palm Springs & El Centro. There was also a ML3.8 on May 1, located in the Walker Pass area of the Sierra Nevada 22 miles east-northeast of Lake Isabella. It was followed on May 7 with a ML3.4 at the same location. Because of the remote location of these earthquakes, we did not receive many felt reports.

June 2002 MAP GRAPH
    The Southern California Seismic Network recorded & analyzed 846 earthquakes in June 2002. 74 of these were M2.0 & larger, seven were M3.0 & larger, one was M4.0 & larger. The month’s largest earthquake was a ML4.4 on June 14, located in the Nevada 29 miles east-southeast of Beatty. It was felt in Las Vegas, Pahrump & the Death Valley region. A much smaller quake on June 18 near Baldwin Hills was widely felt in the Los Angeles Basin. The magnitude was ML3.0. We received 459 felt reports from 85 zip codes, showing a peak intensity of Modified Mercalli IV.

July 2002 MAP GRAPH
    The Southern California Seismic Network recorded & analyzed 958 earthquakes in July 2002. 102 of these were M2.0 & larger, five were M3.0 & larger, none were M4.0 & larger. The month’s largest events were both ML3.7’s. The first occurred on July 24, 4 miles north of Fontana. The Fontana quake was widely felt in the Inland Empire & mountain areas, with 400 responses from 76 zip codes. The peak intensity was IV in the San Bernardino & Riverside areas. The second ML3.7 occurred on July 31, 30 miles east-northeast of Lucerne Valley, or 19 miles west-southwest of Ludlow. It was felt in the Big Bear & Lake Arrowhead areas. This quake was probably an aftershock of the Landers Mw7.3 earthquake of June 1992.

August 2002 MAP GRAPH
    The Southern California Seismic Network recorded & analyzed 829 earthquakes in August 2002. 103 of these were M2.0 & larger, four were M3.0 & larger, none were M4.0 & larger. The month’s largest earthquake was a ML3.8 on August 31, located in the Imperial Valley 1 mile northeast of Westmorland. There were 14 members to this small cluster. There were 2 smaller earthquakes that were fairly widely felt. On August 13, a M2.4 occurred 2 miles south of Culver City. It generated 313 felt reports from 35 zip codes, with a peak intensity of Modified Mercalli IV. There was also a M3.0 located 4 miles south-southwest of Devore, also on August 13. It generated 162 felt reports, from 37 zip codes. Peak intensity was III.

September 2002 MAP GRAPH
    The Southern California Seismic Network recorded & analyzed 920 earthquakes in September 2002. 131 of these were M2.0 & larger, 18 were M3.0 & larger, four were M4.0 & larger. The month’s largest earthquake was a ML4.8 on September 3, located 3 miles northeast of Yorba Linda. The Yorba Linda quake produced 7,816 felt reports from 503 zip codes through most of Southern California. The peak intensity was Modified Mercalli V. Several of its aftershocks were also felt. On September 17, there was a fairly widely felt earthquake 7 miles west-southwest of Anza. The magnitude was ML3.7. 223 people from 69 zip codes responded. On September 21, there was another M4+ quake: a ML4.3 in the San Jacinto fault zone, 6 miles north of Ocotillo Wells. This quake was reported felt from the U.S./Mexico border to Corona & Twentynine Palms. A ML4.1 & a ML4.0, both on September 28, struck 13 miles north-northeast of Trona. There were a few isolated felt reports from Inyokern & Ridgecrest.

October 2002 MAP GRAPH
    The Southern California Seismic Network recorded & analyzed 859 earthquakes in October 2002. 125 of these were M2.0 & larger, 12 were M3.0 & larger, one was M4.0 & larger. The month’s largest earthquake was a ML4.8 Hector Mines aftershock (of the Mw7.1 earthquake of October 1999), on October 29. The epicenter was located 34 miles south-southwest of Baker. There were 101 felt reports from 47 zip codes ranging from the Big Bear area, Barstow, Baker & Twentynine Palms. There were several other widely felt earthquakes. On October 17, a ML2.9 quake occurred just offshore, 2 miles south-southeast of Huntington Beach. It generated 349 responses from 27 zip codes in Orange County & Long Beach. On October 22, a ML3.6 earthquake 4 miles northwest of Big Bear City generated 102 felt reports from 30 zip codes. Maximum intensity was Modified Mercalli III. On October 24, a ML3.8 earthquake 6 miles east-southeast of Anza generated 96 responses in 32 zip codes. Peak intensity was also III.

November 2002 MAP GRAPH
    The Southern California Seismic Network recorded & analyzed 848 earthquakes in November 2002. 130 of these were M2.0 & larger, 13 were M3.0 & larger, one was M4.0 & larger. The largest earthquake, a ML4.1 on November 26, occurred in Mexico, 47 miles south-southwest of Yuma AZ. The month’s largest earthquake that was in Southern California was a ML3.5 on November 8. It was located 8 miles west-southeast of Grapevine (at the bottom of the Grapevine Grade on Interstate 5). This quake was reported felt in Lebec, Frazier Park & Bakersfield.

December 2002 MAP GRAPH
    The Southern California Seismic Network recorded & analyzed 813 earthquakes in December 2002. 155 of these were M2.0 & larger, 11 were M3.0 & larger, three were M4.0 & larger. The largest, a ML4.8 on December 10, was located in Mexico, 35 miles south-southwest of Calexico. This quake was widely felt in San Diego County & Imperial Valley, with a peak intensity of Modified Mercalli IV. There were 500 reports from 95 zip codes. Two of its aftershocks, a ML4.0 also on December 10 & a ML4.2 on December 12, occurred in the same area. The largest quake in our region north of the U.S./Mexico border was a M3.5 on December 22, located 12 miles north-northwest of Indio. It was reported felt in Indio, Palm Desert, Rancho Mirage, Desert Hot Springs & Thousand Palms.



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Division of Geological and Planetary Sciences | California Institute of Technology