<P dir=ltr align=left><STRONG>&nbsp;Longwall mining of coal is conducted </STRONG></P>

19 June 2004 | 07:44 Code : 3788 Geoscience events
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<P dir=ltr align=left><FONT size=2>&nbsp; in several large underground mines west of Bessemer (Fiscor, 2000) ...</FONT></P>

 Longwall mining of coal is conducted in several large underground mines west of Bessemer (Fiscor, 2000). The mining-induced events from this region that are large enough to be detected by the USGS/NEIC automatic event-detection algorithm are also large enough to affect earthquake hazard assessments; they are therefore listed in earthquake catalogs of the USGS/NEIC. Catalogs of routine mining seismicity do not yet contain events from this mining region. The largest suspected mining-induced event from this region that is listed in earthquake catalogs of the USGS/NEIC for 1973 -- March 2000 had MB = 4.8; the largest mbLg recorded for a mining-induced event from this region is 4.0 (see Mining-induced events in the earthquake catalogs of the USGS/NEIC).

tags: QAZVIN


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