An earthquake is the shaking of the Earth's surface caused by a sudden release of energy in the lithosphere, creating seismic waves. Earthquakes vary in intensity, from imperceptible tremors to devastating events capable of causing widespread destruction. Seismic activity is measured by the frequency, type, and size of earthquakes in a specific area, while seismicity refers to the average rate of seismic energy release per unit volume in a particular location.
Since 1900, there have been an average of 18 major earthquakes (magnitude 7.0–7.9) and one great earthquake (magnitude 8.0 or greater) per year.
In 1906, an earthquake occurred along the San Andreas Fault. It was one of the longest earthquake ruptures on strike-slip faults.
More deaths in the 1906 San Francisco earthquake were caused by fire than by the earthquake itself.
The memory of great cities laid waste, such as San Francisco in 1906, shapes the portrayal of earthquakes in modern popular culture.
In 1913, Beno Gutenberg located the Earth's core by analyzing seismograms.
In 1931, the number of seismic stations was about 350.
In 1935, Charles Francis Richter developed the first scale for measuring earthquake magnitudes, known as the Richter scale.
In 1939, an earthquake occurred along the North Anatolian Fault in Turkey. It was one of the longest earthquake ruptures on strike-slip faults.
In 1946, the Vancouver Island earthquake affected a large area by landslides.
In 1957, an earthquake occurred in Alaska. The earthquake's rupture length was one of the longest observed.
On May 22, 1960, the Chilean earthquake reached a magnitude of 9.5. The epicenter was near Cañete, Chile.
In 1960, an earthquake occurred in Chile. The earthquake's rupture length was one of the longest observed.
In 1960, the Valdivia earthquake occurred in Chile, which was the largest earthquake ever recorded, with a magnitude of 9.5.
On March 27, 1964, the Good Friday earthquake was centered in Prince William Sound, Alaska.
In the 1964 Alaska earthquake, soil liquefaction caused many buildings to sink into the ground, eventually collapsing upon themselves.
The Ragged Edge, published in 1968, is about the disaster and focus on its immediate aftermath.
In the 1970 Ancash earthquake, Peru had 22% of all landslide fatalities within the study.
Short Walk to Daylight, published in 1972, is about the disaster and focus on its immediate aftermath.
In 1976, the Tangshan earthquake occurred, resulting in between 240,000 and 655,000 deaths, making it the deadliest earthquake of the 20th century.
Goodbye California, published in 1977, is about the hypothetical "Big One" expected of California's San Andreas Fault.
In 1980, earthquakes served as an early warning of the volcanic eruptions of Mount St. Helens.
In 1988, the Saguenay earthquake affected a large area by landslides.
The memory of great cities laid waste, such as Kobe in 1995, shapes the portrayal of earthquakes in modern popular culture.
Richter 10, published in 1996, is about the hypothetical "Big One" expected of California's San Andreas Fault.
Aftershock: Earthquake in New York, published in 1999, is about the disaster and focus on its immediate aftermath.
The unusually wide zone of damage caused by the 2001 Kunlun earthquake has been attributed to the effects of the sonic boom developed in such earthquakes.
In 2002, an earthquake occurred along the Denali Fault in Alaska. It was one of the longest earthquake ruptures on strike-slip faults.
In 2004, an earthquake occurred in Sumatra. The earthquake's rupture length was one of the longest observed.
In 2004, the Indian Ocean earthquake occurred and it is one of the deadliest earthquakes in history.
In 2004, there was an earthquake swarm activity at Yellowstone National Park.
In the 2005 Kashmir earthquake, Pakistan had 21% of all landslide fatalities within the study.
A Columbia University paper suggested that the 8.0 magnitude 2008 Sichuan earthquake was induced by loading from the Zipingpu Dam.
2012, published in 2009, is about the hypothetical "Big One" expected of California's San Andreas Fault.
It is important not to pathologize the reactions to loss and displacement or disruption of governmental administration and services, but rather to validate the reactions to support constructive problem-solving and reflection, as was observed after the 2010 Haiti earthquake.
Gravitational records associated with the 2011 Tohoku-Oki earthquake were analyzed to confirm that gravitational measurement could provide instantaneous detection of earthquakes.
In August 2012, a swarm of earthquakes shook Southern California's Imperial Valley.
2012, published in 2009, is about the hypothetical "Big One" expected of California's San Andreas Fault.
San Andreas, published in 2015, is about the hypothetical "Big One" expected of California's San Andreas Fault.
In 2016, scientists realized that gravitational measurement could provide instantaneous detection of earthquakes.
In a 2021 study, China stood out in several categories of a study group of 162 earthquakes (from 1772 to 2021) that included landslide fatalities.