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According to the USGS, "ShakeMaps provide near-real-time maps of ground motion and shaking intensity following significant earthquakes. These maps are used by federal, state, and local organizations, both public and private, for post-earthquake response and recovery, public and scientific information, as well as for preparedness exercises and ...
Earthquakes in the New Madrid and Wabash Valley seismic zones from 1974 to 2002, with magnitudes larger than 2.5. The zone had four of the largest earthquakes in recorded North American history, with moment magnitudes estimated to be as large as 7 or greater, all occurring within a 3-month period between December 1811 and February 1812. Many of ...
Thus, earthquakes represent at least a moderate hazard to East Coast cities. Earthquakes in the greater New York City area affect most of New Jersey, the most densely populated state in the United States, as well as New York City. It is difficult to discern the extent to which the Ramapo fault itself (or any other specific mapped fault in the ...
Generalized geologic map of the central Virginia Piedmont with faults and earthquakes (M>2, 1973–2011). The earthquake's epicenter and most of the aftershocks lie between the surface traces of two structures, the Spotsylvania Fault, a southeast dipping zone of high ductile strain, and the Chopawamsic Fault, a thrust fault. [10]
Locations of quakes magnitude 2.5 or greater in the Wabash Valley (upper right) and New Madrid (lower left) Seismic Zones. The Wabash Valley seismic zone (also known as the Wabash Valley fault system or fault zone) is a tectonic region located in the Midwestern United States, centered on the valley of the lower Wabash River, along the state line between southeastern Illinois and southwestern ...
It is often used within earthquake engineering (including seismic building codes) and it is commonly plotted on seismic hazard maps. [6] In an earthquake, damage to buildings and infrastructure is related more closely to ground motion, of which PGA is a measure, rather than the magnitude of the earthquake itself.
Map of the Ramapo Fault System: Earthquake epicenter at Lebanon, NJ. Hopewell Fault (red) and Flemington Fault (light blue) join the Ramapo (yellow) fault near the quake epicenter.
Earthquakes in 2009 resulted in 1,853 fatalities. The 2nd Sumatra earthquake caused an estimated 1,117 deaths to that island, while other majors events struck Italy or Costa Rica . Also notable, the 2009 Samoa earthquake and tsunami registered an 8.1 on the moment magnitude scale , the most powerful earthquake in 2009.