Magnitude 4.4 near San Jose, CA

Information from the UCB & USGS Menlo Park
Location:	17 km E of San Jose (City Hall), CA 37.333 N     -121.699 W
Date & Time (Local):	2001/02/25 15:18:22
Date & Time (UTC):	2001/02/25 23:18:22
Depth (km):	7.8
Mw (preferred):	4.4
ML:	4.4

This earthquake occurred on the Calaveras Fault. The Calaveras Fault runs NNW-SSE through the East Bay and South Bay until it merges with the larger San Andreas Fault near Hollister. The 1984 Morgan Hill earthquake, a magnitude 6.2, had its epicenter just 3 km south of where this earthquake occurred. According to the 1999 report by the Working Group on California Earthquake Probabilities, the Calaveras fault has an 18% probability for producing one or more M6.7 (or higher) earthquakes before 2030.

• Details
  • USGS/UCB Press Release
  • UCB Moment Tensor

  • More information from the USGS

• Seismograms
  • Seismogram from MHC LHZ via "Make Your Own Seismogram"
    MHC is the closest BDSN station to this earthquake.
  • MHC seismogram showing small aftershock
  • A record section of BDSN stations

• Maps
  • "Recenteqs" quad for this event
  • Background seismicity of the Bay Area
    • Bay Area 1980-2001 M>4.0
    • South Bay Area Seismicity 1980-2001 M>3.0
    • 1998
    • 1999
    • 2000

• Ground shaking information
  • Shake Map - see the observed ground motions!
  • Community Internet Intensity Maps - see what other people felt and report your observations!

• Links to other Bay Area Earthquake Resources
  • Bay Area Faults and Earthquakes from the Berkeley Seismological Laboratory's Earthquake FAQ. Has information about the faults in the region and historical earthquakes, with maps and links to additional resources.
  • Bay Area and California Earthquake Probabilities (PDF)
  • Bay Area Earthquake Hazard Maps from the Association of Bay Area Governments (ABAG). Provides maps of predicted ground shaking intensity for Bay Area cities in a variety of earthquake scenarios.
  • Morgan Hill Earthquake of April 1984 by Dr. T. R. Toppozada of the California Division of Mines and Geology (CDMG). This paper, published shortly after the 1984 Morgan Hill earthquake, provides a good summary of the region's historical seismic activity.
  • Walking Tour of the Calaveras Fault in Hollister from Dr. Joe Dellinger.

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