4.4 - local magnitude (ML)

Time Friday, May 1, 2009 at 6:11:13 PM (PDT)

Saturday, May 2, 2009 at 1:11:13 (UTC)

Distance from Westlake Village, CA - 10 km (6 miles) SW (216 degrees)

Malibu, CA - 10 km (7 miles) WNW (294 degrees)

Thousand Oaks, CA - 13 km (8 miles) S (183 degrees)

Casa Conejo, CA - 14 km (9 miles) SSE (156 degrees)

Los Angeles Civic Center, CA - 59 km (36 miles) W (272 degrees)

Coordinates 34 deg. 4.1 min. N (34.069N), 118 deg. 52.9 min. W (118.882W)

Depth 13.9 km (8.6 miles)

Location Quality Good

Earthquake Details

Magnitude 3.5

Date-Time Thursday, April 30, 2009 at 22:50:54 UTC

Thursday, April 30, 2009 at 03:50:54 PM at epicenter

Time of Earthquake in other Time Zones

Location 37.254°N, 121.636°W

Depth 6.6 km (4.1 miles)

Region NORTHERN CALIFORNIA

Distances 14 km (9 miles) N (3°) from Morgan Hill, CA

18 km (11 miles) ESE (102°) from Seven Trees, CA

19 km (12 miles) N (350°) from San Martin, CA

25 km (15 miles) ESE (113°) from San Jose City Hall, CA

Location Uncertainty horizontal +/- 0.1 km (0.1 miles); depth +/- 0.3 km (0.2 miles)

Parameters Nph=116, Dmin=3 km, Rmss=0.08 sec, Gp= 32°,

M-type=regional moment magnitude (Mw), Version=3

Source California Integrated Seismic Net:

USGS Caltech CGS UCB UCSD UNR

Event ID nc51220793

This event has been reviewed by a seismologist.

Generations of Californians have been "putting down roots" along one of the world's most famous faults– the San Andreas. However, few Californians have experienced a major San Andreas earthquake. In Northern California, the last major earthquake was 100 years ago in 1906. Over 3,000 people were killed and 225,000 people were left homeless. In Southern California, the last major earthquake on the San Andreas fault was 150 years ago (1857), rupturing the fault from Central California to San Bernardino. Few people lived in the area, so there was very little damage.

Further south along the San Andreas fault, from San Bernardino through the Coachella Valley to the Salton Sea, over 300 years have passed since the last major earthquake (around 1690). Another major earthquake is likely to happen on this section of the fault within our lifetime. When it does, all of Southern California will be shaken and many areas may be heavily damaged.

There are hundreds of other f...