On September 8th...
M8.2 - Tres Picos, Mexico, 2017
This M 8.2 earthquake offshore of Chiapas, Mexico, occurred as the result of normal faulting at an intermediate depth. Focal mechanism solutions for the earthquake indicate slip occurred on either a fault dipping very shallowly towards the southwest, or on steeply dipping fault striking NW-SE. At the location of this event, the Cocos plate converges with North America at a rate of approximately 76 mm/yr, in a northeast direction. The Cocos plate begins its subduction beneath Central America at the Middle America Trench, just over 100 km to the southwest of this earthquake. The location, depth, and normal-faulting mechanism of this earthquake indicate that it is likely an intraplate event, within the subducting Cocos slab, rather than on the shallower megathrust plate boundary interface. Although the earthquake was offshore, it was widely felt throughout the area on the continent.
M7.4 - Fox Islands, Alaska, 1909
One of the largest earthquakes in the United States.
M7.9 - Southern Italy, 1905
557 deaths. Over 14,000 houses damaged throughout Calabria. Some damage on Lipari Island and in parts of Messina Province. Felt strongly throughout southern Italy and eastern Sicily.
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