The stretching of the Earth's crust in a seismically transitional region likely caused the three quakes that struck Phoenix, Arizona, Sunday night. Such temblors are relatively uncommon in the state.
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.
A record-breaking number of small earthquakes has hit San Ramon, California, over the past two weeks.
Many of the people who were injured from the 6.0-magnitude earthquake in Napa, California, last year were actually hurt during the cleanup effort, after the quake was over, according to a new study.
A 1570 earthquake in Italy shifted the Po River's right bank upward by several inches, forcing the river to change course.
Giant rocks stacked in seemingly gravity-defying poses could indicate that earthquakes on the San Andreas Fault can jump to another major fault in Southern California.
The earthquake that struck Nepal in April shook in a way that spared many small buildings in the city but devastated those more than two stories high, a new study finds.
The incredible energy unleashed by the magnitude-7.8 earthquake that hit Nepal on April 25 moved Mount Everest, the world's tallest peak, more than an inch to the southwest.
Old concrete is not known for standing up to earthquakes, but retrofits made with carbon fiber and shape memory alloy may change that assumption.
A network of undersea faults off the coast of Southern California could produce huge quakes that could send tsunami waves crashing into Los Angeles, new research suggests.
The powerful aftershock that struck Nepal today (May 12) could trigger deadly landslides on slopes already weakened by the April 25 earthquake, experts said.
A 7.3-magnitude earthquake struck Nepal this morning (May 12), toppling buildings and killing at least a dozen people.
Radar waves helped search and rescue teams find and save four people trapped in collapsed buildings after the Nepal earthquake.
Scientists at space agencies across the world are using satellite images and other technologies to aid those affected by Nepal's earthquake.
A subduction zone is a collision between two of Earth's tectonic plates, where one plate sinks into the mantle underneath the other plate.