TY  - JOUR
ID  - epos1423
UR  - http://dx.doi.org/10.1785/0120040045
IS  - 1
A1  - Arabasz, W. J.
A1  - Nava, S. J.
A1  - McCarter, M. K.
A1  - Pankow, K. L.
A1  - Pechmann, J. C.
A1  - Ake, John
A1  - McGarr, Arthur F.
Y1  - 2005/02//
N2  - We describe a multipart study to quantify the potential ground-shaking hazard to Joes Valley Dam, a 58-m-high earthfill dam, posed by mining-induced seismicity (MIS) from future underground coal mining, which could approach as close as ~1 km to the dam. To characterize future MIS close to the dam, we studied MIS located ~3-7 km from the dam at the Trail Mountain coal mine. A 12-station local seismic network (11 stations above ground, one below, combining eight triaxial accelerometers and varied velocity sensors) was operated in the Trail Mountain area from late 2000 through mid-2001 for the dual purpose of (1) continuously monitoring and locating MIS associated with longwall mining at a depth of 0.5-0.6 km and (2) recording high-quality data to develop ground-motion prediction equations for the shallow MIS. (Ground-motion attenuation relationships and moment-tensor results are reported in companion articles.) Utilizing a data set of 1913 earthquakes (M ? 2.2), we describe space-time-magnitude distributions of the observed MIS and source-mechanism information. The MIS was highly correlated with mining activity both in space and time. Most of the better-located events have depths constrained within +-0.6 km of mine level. For the preponderance (98%) of the 1913 located events, only dilatational P-wave first motions were observed, consistent with other evidence for implosive or collapse-type mechanisms associated with coal mining in this region. We assess a probable maximum magnitude of M 3.9 (84th percentile of a cumulative distribution) for potential MIS close to Joes Valley Dam based on both the worldwide and regional record of coal-mining-related MIS and the local geology and future mining scenarios.
PB  - Seismological Society of America
JF  - Bulletin of the Seismological Society of America
VL  - 95
SN  - 0037-1106
TI  - Coal-Mining Seismicity and Ground-Shaking Hazard: A Case Study in the Trail Mountain Area, Emery County, Utah
SP  - 18
AV  - none
EP  - 30
ER  -