Decades of failed attempts to predict earthquakes yield the question: Do quakes give off any warning signs at all?
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.
The rumblings deep underground found seismic activity at deeper-than-expected levels, potentially signaling new earthquake extremes.
Earthquake swarms can raise the risk of a major quake by increasing the overall earthquake frequency, putting pressure on a main fault and setting off larger aftershocks.
The Sept. 3 quake that rattled Pawnee, Oklahoma, has been upgraded to a 5.8 magnitude, making it the state's largest temblor on record. And it was most likely induced by human activity.
A complex system of faults underlying Italy make destructive quakes, like the recent Norcia earthquake, surprisingly common.
Damage on ancient temples in the picturesque hill town of Chamba, India, reveals the region is overdue for a major earthquake.
Scientists figured out how the same tides that affect ocean waves also tug on the giant fault in California.
An earthquake struck off the coast of Florida on Saturday (July 16), a rare event in a relatively tectonically peaceful region.
A massive megathrust earthquake could strike the densely populated region around Bangladesh and east India, putting millions of lives at risk.
Huge lobes of Earth straddling the San Andreas Fault are creeping upward or sinking downward, as if the ground is doing the wave, new research reveals.
Mini earthquakes are shaking Mount St. Helens, indicating that the magma beneath the volcano is on the move, the U.S. Geological Survey (USGS) reports.
They may have happened within days of one another, but the devastating earthquakes in Japan had nothing to do with the strong temblor that struck Ecuador over the weekend, experts say.
Man-made activities are putting Oklahoma and some of its neighboring states in danger of having an earthquake of California-size proportions, the United States Geological Survey (USGS) reports.