Hypocenter


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Related to Hypocenter: reverse fault, Fault scarp

hypocenter

[′hī·pə‚sent·ər]
(geophysics)
The point along a fault where an earthquake is initiated.

Hypocenter

 

the focal point of an earthquake. The depth at which a hypocenter lies can vary from 0 to 700 km. The source of underground shock is movements along tectonic faults, which vary in length up to hundreds of kilometers. In this sense, the hypocenter means the point from which the fault began to rip open. In the upper parts of the earth’s crust (up to 20 km) the hypocenter occurs as a result of brittle deformations in a rock series. Deeper hypocenters arise where plastic deformations prevail.

References in periodicals archive ?
In Nagasaki, newborn death rates skyrocketed in the nine months after the bombing: 43% of pregnancies in which the fetus was exposed within a quarter-mile of the hypocenter ended in spontaneous abortion, stillbirth or infant death.
MOST PEOPLE who have been to contemporary Hiroshima have seen the Atomic Bomb Dome, the shell of a building that was some sixty meters from the hypocenter of the 1945 atomic blast, and which now serves as a modern symbol of that bitter truth commonly referred to as man's inhumanity to man.
0 or greater and a maximum hypocenter depth of 200 kilometers or deeper will cause full payment of the bond's value to the nation's Fondo de Desastres Naturales (FONDEN), or natural disaster fund.
If black culture is the epicenter of popular culture in America, vogue culture is the hypocenter.
The layered 1D model was subsequently used to compute absolute hypocenter locations using the program Hypoinverse (Klein 2002), and high-precision relative locations using the double-difference algorithm HypoDD (Waldhauser & Ellsworth 2000).
The hypocenter was estimated to be 12 miles below the earth's surface.
The information included location of hypocenter, magnitude, and island-wide intensities.
Li visited the Nagasaki Peace Park in the city and offered flowers at a memorial at the hypocenter of the atomic bomb that devastated the city in August 1945.
Unlike diffracted P waves, which bounce from an earthquake's hypocenter down 2,000 miles along the boundary, PKP waves go directly through the inner core of the Earth.
The Japan Meteorological Agency (JMA) reported that the depth of the hypocenter was 14 kilometers, which is considered to be a relatively shallow earthquake.
The overpressure at the hypocenter (the spot directly under the explosion) at Hiroshima is estimated to have reached 4.
While they can't be positive, seismologists suspect that somewhere beneath Point Reyes lay the 1906 quake's hypocenter - the point on the fault that first ruptures.