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2008-11-24_PERMIT FILE - C1996083 (5)
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2008-11-24_PERMIT FILE - C1996083 (5)
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Last modified
8/24/2016 3:38:13 PM
Creation date
2/23/2009 4:57:27 PM
Metadata
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Template:
DRMS Permit Index
Permit No
C1996083
IBM Index Class Name
Permit File
Doc Date
11/24/2008
Doc Name
3rd Quarter 2007 North Fork Valley Seimic Network Monitoring Report
Section_Exhibit Name
Volume IIIA Exhibit 18 Seismic Monitoring at BR Longwall Coal Mine
Media Type
D
Archive
No
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• <br />North Fork Valley Seismic Network -Third Quarter 2007T <br />three-component accelerometers. The locations of seismographic stations operating during the <br />2007 third quarter are presented in Table 1 and shown on Figure 1. <br />Table 1. Seismograph Stations of the North Fork Valley Seismic Network <br />• <br /> <br />Station Latitude <br />de rees <br />( g ) Longitude <br /> <br />(degrees) Elevation <br /> <br />(ft) [m] Station <br />Correction <br /> <br />(sec) <br />Station Name <br />Owner <br />BWK 38.928 -107.537 6701 [2042] 0.027 Bowie King Mine BRL <br />FGH 38.948 -107.536 7201 [2195] 0.094 Freeman Gulch Hubbard BRL <br />LLM 38.857 -107.461 8240 [2512] 0.233 Lion Mesa MCC <br />MCD 38.881 -107.474 7274 [2217] 0.104 Minnesota Creek Dam MCC <br />MFB 38.956 -107.559 7924 [2415] 0.191 Middle Forest Boundary BRL <br />SPG 38.872 -107.425 8174 [2491] 0.224 South of Poison Gulch MCC <br />SEF 38.874 -107.390 8667 [2642] 0.290 South of East Flatiron MCC <br />TCR 38.982 -107.564 8483 [2586] 0.265 Terror Creek Dam BRL <br />WFW 38.901 -107.424 8433 [2570] 0.259 West Flatiron West MCC <br />WTM 38.941 -107.591 7954 [2424] 0.195 West Tower Mountain BRL <br />The development of NFVSN is described in previous reports. Real-time processing utilizes <br />modules from the Earthworm software suite developed by the U.S. Geological Survey (USGS) <br />in Menlo Park, California (Johnson et al., 1995). The program detects, automatically locates, and <br />saves event data for triggered events. The network is divided into two sub-nets (each with five- <br />stations), one in each of the two main mining areas (Figure 1). <br />DATA PROCESSING <br />Identification of Events <br />Events are regarded as seismic in origin and logged by the Earthworm triggering system if they <br />appear on five or more stations with significant amplitude, impulsive onset and appropriate time <br />differences between stations. Triggering occurs within the two sub-nets (five stations in each) so <br />that important events are not missed. Earthworm also provides automatic locations for events <br />that have sufficient arrival time picks. During the third quarter, Earthworm detected and located <br />1872 events (not all of which were seismic events). Many more triggered waveform files were <br />recorded, many of which have insufficient station data for locating the events. <br />W:\X_WCFS\PROJECTSINORTH FORK-BOWIE\QUARTERLY REPORTS\2007 03\03 2007 BRL FINAL.DOC112-FEB-08110AK 2 <br />
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