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The frequency of aftershocks decreases roughly with the reciprocal of time after the main shock. This empirical relation was first described by Fusakichi Omori in 1894 and is known as Omori's law. [1] It is expressed as = + where k and c are constants, which vary between earthquake sequences.
Japan had experienced 900 aftershocks after the M9.1 earthquake on March 11, 2011 with about 60 aftershocks being over magnitude 6.0 and three over magnitude 7.0. For conciseness, only earthquakes with magnitudes greater than 7.0 or an intensity greater than lower-6 on the shindo scale are listed here.
The USGS estimated that the earthquake could cause economic losses measuring between 1–10% of Vanuatu's GDP. [19] The United Nations Office for the Coordination of Humanitarian Affairs estimated that 116,000 people had been directly affected by the earthquake, [44] equivalent to a third of Vanuatu's population. [45] Among them were 14,000 ...
The USGS recorded 28 aftershocks following Friday’s rare earthquake, with the largest aftershock – clocking in at a 3.8 magnitude – striking Gladstone, New Jersey, 20 minutes from the ...
Aftershocks are possible in the following days, months or years after Friday's 4.8 magnitude earthquake, which was felt throughout parts of New York.
The USGS puts the chances of a New Jersey earthquake measuring 4.8 or higher in the next week at 1 in 200, or 0.5%. The odds go down to 0.3% for a quake 5 or above, 0.03% for 6 or above and 0.003% ...
The third aftershock cluster was in the Santa Susana Mountains after a M w 5.6 aftershock 11 hours after the mainshock. That event and its aftershocks were distributed along a 10 km (6.2 mi) strike and vertically within the crust, likely associated with faults that did not rupture during the mainshock. [11] [15]
Aftershocks continued Friday after a strong earthquake that prompted a tsunami warning for parts of the U.S. West Coast Thursday. "At this time, there have been 59 earthquakes of magnitude three ...