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Peak ground acceleration (PGA) is equal to the maximum ground acceleration that occurred during earthquake shaking at a location. PGA is equal to the amplitude of the largest absolute acceleration recorded on an accelerogram at a site during a particular earthquake. [1] Earthquake shaking generally occurs in all three directions.
An accelerograph can be referred to as a strong-motion instrument or seismograph, or simply an earthquake accelerometer.They are usually constructed as a self-contained box, which previously included a paper or film recorder [1] (an analogue instrument) but now they often record directly on digital media and then the data is transmitted via the Internet.
On December 5, 2024, a M w 7.0 earthquake struck off the coast of Humboldt County, California, at 10:44 a.m. PST. It was felt in the state's northern regions and in the Central Valley. [2] The earthquake prompted the National Weather Service to issue a tsunami warning which was canceled soon after.
The largest earthquake in U.S. history was the 1964 Good Friday quake in Alaska, a 9.2 magnitude temblor that killed 131 people. ... Any time there's an earthquake, one concern is that it was ...
The prediction is based on research done by dozens of scientists and engineers using seismic studies, historical geological data and new information to identify nearly 500 additional fault lines ...
Earthquake history of the United States through 1970 at USGS; Earthquake Data and Information at National Centers for Environmental Information (NCEI) Thomas Fuller; Anjali Singhvi; Mika Gröndahl; Derek Watkins (June 4, 2019). "Buildings Can Be Designed to Withstand Earthquakes. Why Doesn't the U.S. Build More of Them?". The New York Times
ShakeMap for the 2001 Nisqually earthquake In seismology , strong ground motion is the strong earthquake shaking that occurs close to (less than about 50 km from) a causative fault . The strength of the shaking involved in strong ground motion usually overwhelms a seismometer , forcing the use of accelerographs (or strong ground motion ...
The method is still widely used nowadays in engineering practice to assess the consequences of earthquakes on slopes. In the special case of earth dams, it is used in conjunction with the shear beam method which can provide the acceleration time history at the level of the failure surface. It has been proved to give reasonable results and quite ...