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According to the Southern California Earthquake Center (SCEC), the difference between an earthquake, also known as the mainshock, and an aftershock is that an aftershock follows closely in the wake of a larger earthquake and in approximately the same area as that earthquake. Earthquakes are usually


A large number of earthquakes occur in California because it is home to hundreds of known faults. At least 200 of the faults in California are considered potentially hazardous, and more than 70 percent of the population of the state lives within 30 miles of a fault.


California has a relatively high number of earthquakes due to its position on both the Pacific and North American Plates. These plates are in constant motion, and earthquakes occur when their sides slip against one another suddenly.


An earthquake is a sudden shaking or rolling of the ground caused by movements under the earth's surface. Some earthquakes can be mild while others may be severe causing massive devastation to structures, life and other natural resources.


Earthquakes are caused by sudden movement in opposing tectonic plates in the earth. As plates move against each other, sometimes the rocky edges catch against one another. The rest of the plate remains in motion, putting stress on the sticking point, and when it gives way, an earthquake occurs.


Earthquakes occur when two blocks of Earth's crust slip past each other suddenly. Tectonic plates fit together like pieces of a puzzle and are continually moving. The edges of tectonic plates are rough and sometimes stick, causing an earthquake when they break free.


The first earthquake to ever take place is unknown as it happened before the records of the events were kept. The first recorded earthquake was in 1769.


Earthquakes are natural processes that occur beneath the earth's surface and, if strong enough, their reverberations can not only be felt by humans but can induce significant damage to the environment. Scientists are constantly striving to learn more about the causes and processes of earthquakes. Th


Scientists estimate that over 10,000 earthquakes occur in California each year. Most of these go unnoticed since they are minor. For example, only several hundred have a magnitude greater than 3.0 and of these,only 15 to 30 have a magnitude in excess of 4.0.


Those interested in finding out the most recent earthquakes in California can find out at sites such as the United States Geological Survey (earthquake.usgs.gov) and the California Institute of Technology's Earthquake Data Center (scedc.caltech.edu). The United States Geological Survey broadcasts Ca