Magnitude 4.0 - SAN FRANCISCO BAY AREA, CALIFORNIA
2011 October 20 21:41:04 UTC
- This event has been reviewed by a seismologist.
|Depth||8.2 km (5.1 miles)|
|Region||SAN FRANCISCO BAY AREA, CALIFORNIA|
|Location Uncertainty||horizontal +/- 0.1 km (0.1 miles); depth +/- 0.2 km (0.1 miles)|
|Parameters||Nph=258, Dmin=1 km, Rmss=0.17 sec, Gp= 14°,|
M-type=regional moment magnitude (Mw), Version=B
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Scientific & Technical Information
The earthquake locations and magnitudes cited in NOAA tsunami statements and bulletins are preliminary and are superseded by USGS locations and magnitudes computed using more extensive data sets.