Magnitude 2.8 SAN FRANCISCO BAY AREA, CALIFORNIA
Thursday, April 16, 2009 at 23:40:36 UTC
Preliminary Earthquake Report
Magnitude | 2.8 |
---|---|
Date-Time |
Time of Earthquake in other Time Zones |
Location | 38.08N 121.98W |
Depth | 18 kilometers |
Region | SAN FRANCISCO BAY AREA, CALIFORNIA |
Distances |
15 km (10 miles) NNE of Concord, California 15 km (10 miles) NNW of Clayton, California 20 km (10 miles) WNW of Antioch, California 70 km (45 miles) SW of SACRAMENTO, California |
Location Uncertainty | Error estimate not available, held by USGS NEIC to another agency's solution |
Parameters | not available |
Source | Northern California Seismic Network, UC Berkeley & USGS Menlo Park, USA |
Remarks | Felt (II) at Clayton and Concord. |
Event ID | usfmb4 |
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NB:
The official magnitude for this earthquake is indicated at the top of this page.
This was the best available estimate of the earthquake's size,
at the time that this page was created. Other magnitudes associated
with web pages linked from here are those determined at various times
following the earthquake with different types of seismic data.
Although, given the data used, they are legitimate estimates of magnitude
they are not considered the official magnitude.
The region name is an automatically generated name
from the Flinn-Engdahl (F-E) seismic and geographical regionalization scheme.
The boundaries of
these regions are defined at one-degree intervals and therefore differ from
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Preliminary Earthquake Report
U.S. Geological Survey, National Earthquake Information Center
World Data Center for Seismology, Denver