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A Swarm of Magnitude ~5 Earthquakes Southeast of Calexico

08-19 February 2008

  • AUTHOR: Debi Kilb
  • DATE: 2008-02-09


In February 2008, a swarm of four magnitude ~5 earthquakes occurred southeast of Calexico. These mainshocks were felt by ~1000’s of people in the San Diego region. The largest earthquakes included: (1) A Magnitude 5.4 at 11:15 PM on Friday Feb 8th; (2) A magnitude 5.1 at 10:30 AM on Monday Feb 11th; (3) A magnitude 5.0 at 8:30 PM on Monday Feb 11th; and (4) A magnitude 5.0 at 2:41 PM on Tuesday Feb 19th. To help assess the spatial relationship between these earthquake and the seismicity in the region we include the four largest earthquakes (all over magnitude 5; red diamonds), 82 aftershocks (orange spheres), ~7000 historic earthquakes (yellow points) and earthquakes over magnitude 4 (yellow cubes). Waveforms from the 5.4 mainshock event as recorded by the ANZA seismic network in southern California are also included in the visualization. Also included are EarthScope’s USArray seismic stations (green cylinders), town names (orange text), primary roads (purple lines), known fault traces (brown lines), an outline of the state of California (grey lines), and seismic station telemetry paths from the ANZA network (green lines). We include topography and bathymetry of the region where regions of high elevation are in browns and light greens and regions of lower elevations are in forest greens, on the sea floor light blue indicates higher elevations than the darker blues.


Links to websites:
http://eqinfo.ucsd.edu/special_events/2008/040/a/
http://anf.ucsd.edu/spevents/2008/040/a/
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