A new layer of stiff rock may unexpectedly exist deep inside Earth, researchers say.
Earthquakes are the result of plate tectonics, or shifting plates in the crust of Earth, and quakes occur when the frictional stress of gliding plate boundaries builds and causes failure at a fault line. In an earthquake, elastic strain energy is released and waves radiate, shaking the ground. Scientists can predict where major temblors might occur in a general sense, but research does not yet allow forecasts for specific locations or accurate predictions of timing. Major earthquakes, some generating tsunamis, have leveled entire cities and affected whole countries. Relatively minor earthquakes can also be induced, or caused by human activity, including extraction of minerals from Earth and the collapse of large buildings.
Two new studies explain why some regions of the country are rattling more than others as oil and gas production rises.
Researchers are tuning in to urban seismic noise, the man-made signals from human activity, to view geologic structures and track the rhythms of cities.
A small part of the San Andreas Fault thought to quietly slide without shaking its neighbors may be capable of magnitude-6 earthquakes, a new study finds.
Sports will further science this playoff season, as seismologists monitor the home stadium of the Seattle Seahawks during games in order to test a nascent earthquake early-warning system.
A hydraulic fracturing, or fracking, well in Ohio triggered scores of small earthquakes in March 2014, including one large enough to be felt in nearby towns.
An ancient Chinese civilization that was mysteriously abandoned may have disappeared because of an earthquake that rerouted the city's water flow, new research suggests.
Football, NASCAR and their rowdy, roaring crowds were pitted in a head-to-head battle this year to see which sport hits highest on the seismic charts.
Italian scientists convicted of manslaughter in connection with the 2009 L'Aquila earthquake won their appeal on Monday (Nov. 10).
Small islands boost the power of tsunami waves, rather than absorbing their impact, a new study shows.
Earthquake science has kept pace with San Francisco's tremendous transformation since the 1989 Loma Prieta earthquake.
Incredible images from the Oct. 17, 1989 Loma Prieta earthquake in California's Santa Cruz mountains.
Four San Francisco Bay Area faults have built up enough seismic strain to unleash destructive earthquakes.
A deep-drilling project into one of the world's most dangerous earthquake faults kicked off Saturday (Oct. 4) on New Zealand's South Island.
An ancient, catastrophic flood or earthquake may explain how a bewildering rock formation in Colorado's Rocky Mountains formed, a new study finds.
An earthquake of magnitude 6.2 shook southern Alaska Thursday (Sept. 25), according to the U.S. Geological Survey.