ShakeMap - USGS Earthquake Hazards Program
4 days ago · ShakeMaps provide near-real-time maps of ground motion and shaking intensity following significant earthquakes. These maps are used by federal, state, and local organizations, both public and private, for post-earthquake response and recovery, public and scientific information, as well as for preparedness exercises and disaster planning.
Ground Shaking Simulations - USGS Earthquake Hazards Program
To better understand the distribution of shaking from past and anticipated future earthquakes, seismologists have constructed computer models of earthquakes and the resulting ground shaking.
Earthquake Processes and Effects
Ground Shaking. Two important local geologic factors that affect the level of shaking experienced in earthquakes are (1) the softness of the surface rocks and (2) the thickness of surface sediments.
Earthquake Distance Effects
Earthquake Distance Effects. As sound travels through the air or earthquake shaking travels through the ground, the waves lose energy. And so a band sounds louder close to the stage than further back and an earthquake feels stronger close to the fault than further away.
For Teachers - USGS Earthquake Hazards Program
This page contains snapshots of the video clips from a computer simulation of ground shaking from the 1906 earthquake with annotations of some of the key scientific features. Teachers can use the video clips in their classroom to help teach about seismic waves and earthquake hazards.
Background - USGS Earthquake Hazards Program
The Lawson Report, published in 1908, describes in detail the shaking and damage observed at various sites in Central California during the 1906 earthquake. These descriptions have been recently re-evaluated in terms of modern intensity scales, …
Did You Feel It? - USGS Earthquake Hazards Program
4 days ago · Annual Data Viewer. Cumulative and yearly response maps for earthquakes in the U.S. and around the world using an interactive map. Export a map view using the printer icon in top left corner of map.
"How Much Bigger…?" Calculator - USGS Earthquake Hazards …
How much bigger is a magnitude 8.7 earthquake than a magnitude 5.8 earthquake? An explanation of the magnitude of an earthquake versus the strength, or energy release, of an earthquake... with a little bit of math.
CSZM9 (Scenario Catalog) - USGS Earthquake Hazards Program
This catalog contains “ensemble ShakeMaps” based on the 2nd, 16th, 50th (median), 84th, and 98th percentile ground motions from a set of thirty magnitude 9 (M9) Cascadia earthquake rupture scenarios. All maps are based on the geometric mean of two horizontal components.
Southern California ShakeOut - USGS Earthquake Hazards Program
The Great Southern California ShakeOut earthquake drill is based on a magnitude 7.8 scenario earthquake on the San Andreas fault in southern California. This portion of the San Andreas fault has been identified as the most likely source of a very large earthquake in California (Working Group on California Earthquake Probabilities).