Last night the USGS issued a #ShakeAlert for a M 5.5 quake in the Baja California-Sonora border region. See: earthquake.usgs.gov/earthquakes/ev… Look for the ShakeAlert link to learn more. (1/5)
Light shaking (MMI 4) was outside of California so no @fema WEA ShakeAlert was distributed - see color scale for comparison. Even though this earthquake was outside the seismic network and harder to locate #ShakeAlert performed well. (2/5)
The *final* quake location determined by the USGS National Earthquake Information Center (NEIC) and the location of the *initial* #ShakeAlert (at 13 seconds) differed by about 19 mi. When the final ShakeAlert was issued (at 15.4 s) the location improved (to about 5 mi). (3/5)
Check out the black dot in the left image (location of initial #ShakeAlert) and the final quake location in the right image (from the NEIC). (4/5)
For #ShakeAlert determining the location of an event quickly and with great accuracy is a very important goal. Every earthquake teaches us how to improve your West Coast Earthquake Early Warning System. @Cal_OES @waEMD @OregonOEM (5/5)
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