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earthquake
information on the web
After
an earthquake, knowing more about what just happened can
reduce fears and help you understand what to expect next.
Online earthquake information products
include:
Location
and magnitude of recent earthquakes
Within
1 to 2 minutes of an earthquake, its location and
magnitude are available at several Web sites,
including
http://earthquake.usgs.gov/
and
http://quake.usgs.gov/recenteqs/latest.htm
"ShakeMap"
Within
5 to 10 minutes of most felt earthquakes (magnitude 3.5
and greater) in the Bay Area, a "ShakeMap" is posted on
the Web. This map shows the range of shaking intensities
across a region. Every quake has only a single magnitude,
but it produces a range of shaking intensity values over
the area in which it is felt.
ShakeMaps
use data from seismic instruments to provide a rapid
picture of where the strongest shaking occurred. These
maps help to identify areas where a quake's impact is
greatest and are used by emergency managers to speed
disaster response. ShakeMaps are available at
http://www.cisn.org/shakemap.html
or
http://earthquake.usgs.gov/shakemap/
"Did
You Feel It?" -- Tell us what you felt!
Personal
experiences of the effects of an earthquake are very
valuable to scientists. When you have felt a quake,
please report your observations by using a quick survey
found on the U.S. Geological Survey "Did You Feel It?"
Web site at
http://pasadena.wr.usgs.gov/shake/ca/
When
you fill out this online survey, your observations of
actual damage and shaking are combined with those of
thousands of other people. The quake's shaking
intensities, derived from these observations, are
displayed by ZIP code on a "Community Internet Intensity
Map."
Who
monitors California's earthquakes?
Earthquake
monitoring for California is done by the California
Integrated Seismic Network (CISN), a partnership among
the U.S. Geological Survey (USGS), University of
California Berkeley, Caltech, the California Geological
Survey, and the Governor's Office of Emergency Services.
CISN is part of a USGS national seismic-monitoring
program called the Advanced National Seismic System
(ANSS).
For
more information go to:
http://www.cisn.org/
http://www.anss.org/
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