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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.
A 5.2-magnitude earthquake struck near Lamont, California, ... The US Geological Survey reported the earthquake’s epicenter hit about 15 miles southwest of Lamont – and roughly 25 miles south ...
The earthquake's epicenter was offshore of Humboldt County, close to the state line with Oregon. Humboldt Sheriff William Honsal said some homes had cracked foundations and broken windows after ...
“Drop, Cover, Hold on. Protect yourself,” the U.S. Geological Survey warned moment before the eathquake struck.
The China Earthquake Networks Center gave the earthquake a magnitude of M s 7.1, [3] while the United States Geological Survey said the earthquake measured M ww 7.0. [2] It struck at 02:09 CST (18:09 UTC) [4] at a depth of 13 kilometers (8.1 miles). [2] The epicenter was located in a mountainous area with an average altitude of about 3,048 ...
Earthquakes are caused mostly by the rupture of geological faults but also by other events such as volcanic activity, landslides, mine blasts, fracking and nuclear tests. An earthquake's point of initial rupture is called its hypocenter or focus. The epicenter is the point at ground level directly above the hypocenter.
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. [Notes 3] The value of the epicenter distance Δ is found on the travel timetable according to the arrival time difference between the P wave and S wave. [4]
On Friday, at 10:26 a.m., a magnitude 3.6 earthquake — down from an original estimate of 3.8 — occurred with an epicenter just north of the Ojai Valley, causing weak shaking to be felt from ...