Catalog of Significant Historical Earthquakes in the Central United States
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资源简介：
The Catalog of Significant Historical Earthquakes in the Central United States
use Modified Mercalli intensity assignments to estimate source locations and
moment magnitude M for eighteen 19th-century and twenty early- 20th-century
earthquakes in the central United States (CUS) for which estimates of M are
otherwise not available. We use these estimates, and locations and M estimated
elsewhere, to compile a catelog of significant historical earthquakes in the
CUS. The 1811-1812 New Madrid earthquakes apparently dominated CUS seismicity
in the first two decades of the 19th century. M5-6 earthquakes occurred in the
New Madrid Seismic Zone in 1843 and 1878, but none have occurred since 1878.
There has been persistent seismic activity in the Illinois Basin in southern
Illinois and Indiana, with M > 5.0 earthquakes in 1895, 1909, 1917, 1968, and
1987. Four other M > 5.0 CUS historical earthquakes have occurred: in Kansas in
1867, in Nebraska in 1877, in Oklahoma in 1882, and in Kentucky in 1980.
[Summary provided by the USGS.]
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CEOS_EXTRA
