Search results
Results From The WOW.Com Content Network
Hypocenter (Focus) and epicenter of an earthquake. An earthquake's hypocenter or focus is the position where the strain energy stored in the rock is first released, marking the point where the fault begins to rupture. [3] This occurs directly beneath the epicenter, at a distance known as the hypocentral depth or focal depth. [3]
The epicenter (/ ˈ ɛ p ɪ ˌ s ɛ n t ər /), epicentre, or epicentrum [1] in seismology is the point on the Earth's surface directly above a hypocenter or focus, the point where an earthquake or an underground explosion originates.
The epicenter is the point at ground level directly above the hypocenter. The seismic activity of an area is the frequency, type, and size of earthquakes experienced over a particular time. The seismicity at a particular location in the Earth is the average rate of seismic energy release per unit volume.
The epicenter of the Northridge earthquake in Los Angeles in 1994 was in the San Fernando Valley, ... But the hypocenter, the location where the quake actually occurred, was more than 11 miles ...
The hypocenter/epicenter of an earthquake is calculated by using the seismic data of that earthquake from at least three different locations. The hypocenter/epicenter is found at the intersection of three circles centered on three observation stations, here shown in Japan, Australia and the United States.
Even if the depth of focus of an earthquake is very deep, it can still have a very short epicentral distance. [3] When measuring the epicentral distance of an earthquake with a small epicentral distance, first measure the reading of the initial motion of P wave, and then confirm the arrival of S wave.
The depth to the hypocenter can be estimated by comparing the sizes of different isoseismal areas. In shallow earthquakes, the lines are close together, while in deep events the lines are spread further apart.
English: Diagram of the epicenter of an earthquake in relation to its hypocenter/focus point. Derived from original work by Sam Hocevar. Derived from original work by Sam Hocevar. Русский: Эпицентр и гипоцентр землетрясения