Software
for Download
Several USGS scientists have authored software packages for use
in their research. These programs include stress-triggering software,
a general purpose 2-D seismic seismic ray tracer, conversions from
UTM to Lat/Long, and others. Descriptions of these programs and
access to downloadable versions are now available on the web.
USGS
Scientific Expedition: Earthquake in Turkey - 1999
Scientists and engineers from the U.S. Geological Survey departed
for the epicentral region on August 19, 1999, less than 2 days after
the quake occurred, to join in an international scientific effort
that will deploy seismic and geodetic instruments, make geologic
field measurements and assess and record the structural damage.
Loma Prieta
Earthquake 10th Anniversary Review (1999)
We review the scientific progress and accomplishments that have
been made in understanding and mitigating the earthquake hazard.
We present a retrospective of the earthquake, including many photos.
Is Earthquake Prediction
Possible?
Earthquake prediction is a controversial topic.
Now, the international journal Nature brings us a moderated, on-line
debate among 8 seismologists, including the USGS's Andrew Michael.
1906 San Francisco Earthquake
In-depth reports from seismological and societal perspectives including
background, casualties, damage, and what was learned scientifically.
Lots of great photos and eyewitness accounts.
Effect of Soil Type
on Shaking Hazard
The type of soil at a site affects the strength of seismic shaking
there. Softer soils amplify the shaking. Learn about this effect
and use an interactive map to determine the soil type at any site
in the San Francisco Bay area.
The 1998 USGS
Expedition to Mongolia
Discover what Mongolian earthquakes can reveal about earthquake
hazards in the U.S.
Northridge, California,
Earthquake Studies
These pages summarize the results of numerous scientific investigations
into the nature of the earthquake source, the shaking it produced
and its damaging effects in the Los Angeles area.
Speeding Earthquake Disaster Relief
Scientists and emergency managers have found new ways to speed and
improve relief efforts with the rapid availability of earthquake
information from seismograph networks.
Building Safer
Structures
By monitoring how structures respond to earthquakes and applying
the knowledge gained, scientists and engineers are improving the
ability of structures to survive major earthquakes.
The Mississippi Valley
- "Whole Lotta Shakin' Goin' On"
In the winter of 1811-12, the central Mississippi Valley was struck
by three of the most powerful earthquakes in U.S. history. Even
today, this region has more earthquakes than any other part of the
United States east of the Rocky Mountains.
Seismology at the Science
Fair
Earthquakes provide lots of great opportunities for science
fair projects. Do Lost Pet Ads Predict Earthquakes? Will Overstressed
Bridges Survive Earthquakes?
Studying Earthquakes
Earthquake research developments at the USGS Earthquake Hazards
Team in Menlo Park, California. Sections on seismology, strong-motion
seismology, crustal structure, crustal deformation, geology, bore
hole geophysics and rock mechanics.
Listening to Earthquakes
This page explores the relationship between seismic waves and sound
waves - in this case, music. Requires good loud speakers or headphones
on your computer.
GPS and Earthquake Hazard
Reduction
Introduction to the role of Global Positioning Satellite data in
earthquake studies.
Gurvan Bulag
Thrust Fault
Summary of the 1997 USGS expedition to Mongolia to study the 1957
Gobi Altay earthquake - a 23-km-long thrust rupture - which is considered
a possible analog for future earthquakes in southern California.
Late Night Musings of an Earthquake
Seismologist
A USGS seismologist/homeowner reflects on the perception of earthquake
risk in the wake of the 1994 Northridge, California, earthquake.
Hawaiian Earthquake
Activity
Earthquakes in Hawaii are closely linked to volcanism. They are
an important part of the processes of island-building that have
shaped the Island of Hawaii and the other Hawaiian Islands. Thousands
of earthquakes occur every year beneath the Island of Hawaii.
Thickness
of the Outer Layer of the Earth
Contour map of the thickness of the Earth's crust, and a tour of
the data and methods used to produce it.
Measuring Plate
Motions with GPS
Maps showing velocities of survey stations determined using data
from the Global Positioning Satellite system. For California & Nevada
and for North America.
Crustal
Deformation Measurements
The Earth's surface near active faults deforms before, during and
after earthquakes and near active volcanoes as a consequence of
eruptions. This deformation can be observed as relative movement
of points on the Earth's surface, ground tilt, ground strain, and
fault slip (creep). Measurements from San Francisco Bay, San Juan
Bautista, Parkfield, Long Valley and southern California.
Deformation
and Stress-Change Modeling and Monitoring
A research page focusing on geodetic modeling using GPS
and InSAR data; and earthquake stress triggering and stress transfer
analyses.
Earthquakes, Minerals
And Me: An Interview with Robert Wallace
A USGS seismologist/homeowner reflects on the perception of earthquake
risk in the wake of the 1994 Northridge, California, earthquake.
Finding the Starting Point
of Earthquakes
A primer on the method seismologists use to determine the location
and time of an earthquake from signals recorded by seismometers.
Next Big Earthquake in
the San Francisco Bay Area
A very readable and thorough review of the probability of an earthquake
and how to prepare for it. Written in 1989 after the Loma Prieta
earthquake.
Weekly Seismicity Reports
View online or sign up for a free email subscription to these weekly
summaries of earthquake activity in northern California.
Potential for Large Earthquakes
in Northern California
Report and database on the active faults and geologic information
about them, including slip rate, strain rate and seismicity. USGS
Open-File Report 96-705.
What Happens When an Earthquake
Occurs
How we process the data from an earthquake: from network detection,
telemetry, and calculation of its location, magnitude and time,
to swiftly moving the results to our real-time
maps.
California, Nevada, and
Baja California Earthquakes: 1769-Present
Compilation of earthquakes (magnitude ~6 and larger) exerpted from
USGS Professional Paper 1515 and updated. By William L. Ellsworth.
Earthquakes and Gunshots
An adaptation of seismological methods
to locate earthquakes is used now to locate gunshots. This system
helps police rapidly respond to illegal gunfire and reduce crime
in urban neighborhoods.
Earthquakes in Alaska
A detailed map showing the overall geologic setting in Alaska that
produces earthquakes. Shows faults, plate motions and major earthquakes.
Earthquake Fact Sheets
These colorfully illustrated, readable summaries highlight a variety
of earthquake hazard and risk-mitigation topics.
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