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(US), epicenter
the point on the earth's surface directly above the focus of an earthquake or underground nuclear explosion



(1) The projection of the hypocenter of an earthquake onto the earth’s surface (seeHYPOCENTER). The location of the epicenter is determined from recordings by seismic stations, and the epicentral region is determined by the degree of destruction on the surface. Epicenter maps showing the magnitudes of earthquakes are used in seismic zoning. (See alsoEARTHQUAKES.)

(2) The projection onto the earth’s surface of the center of an atmospheric (underwater or underground) nuclear explosion.


A point on the surface of the earth which is directly above the seismic focus of an earthquake and where the earthquake vibrations reach first.
The center of a circle that generates an epicycloid or hypocycloid.
References in periodicals archive ?
The Prevention Epicenter program discovers solutions and refines them so they can work to prevent infections for all health care settings," Dr.
Features that were formerly available only under Extreme Networks advanced upgrade license are now included across all EPICenter license tiers, resulting in a consistent set of features across the product line.
In a previous interview, Gordon described Epicenter as a solution to filling space in malls left behind by shuttered department stores.
Counties outside the epicenter (the "non-epicenter") were divided into four radial regions, R1 to R4, with increasing distance from the epicenter (Figure 1).
To the north, in the Santa Clarita Valley, and at the epicenter in the San Fernando Valley, near Northridge and Sylmar, many universities, colleges, and private dance studios reported damage to their facilities and the suspension of classes for an extended time.
Then walk 1/2 mile east on Aptos Creek Trail to a second sign marking the epicenter itself.
So diverse are the material growth capabilities in the Epicenter that sponsorship was split among the university's Materials Research Lab, Coordinated Science Lab, and Center for Compound Semiconductor Microelectronics.
22) and its epicenter was traced 15 km southeast of this same town, with a shallow depth of only 5 km, Phivolcs said.
On Phivolcs Earthquake Bulletin, the tremors' epicenter was in Tabaco City.
The Prevention Epicenters funded from 2016 to 2020 are Chicago Prevention and Intervention Epicenter at Rush University Medical Center and Cook County Health and Hospitals System; Duke University and the University of North Carolina; The Harvard Pilgrim Health Care and University of California, Irvine; The University of Pennsylvania; and Washington University School of Medicine in St.
8 on the Richter scale was felt with its epicenter 28 kilometres north of Murghob in Tajikistan reported the US Geological Survey.