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Keywords: event location
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Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1359
.... The results of this experiment have successfully demonstrated that DOFS can acquire high quality seismic signals associated with longwall mining and that highly accurate event location can be achieved using the fiber data. Several challenges have been identified in this experiment and they must be addressed...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-493
... longwall panel temporary deployment Magnitude geophone Reservoir Characterization north gateroad proceedings seismicity event location Rock mechanics geomechanics Symposium 1. INTRODUCTION Mining-induced seismicity (MIS), the release of seismic energy in response to mining, is a common...
Proceedings Papers

Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2017
Paper Number: ARMA-2017-0037
... to unknowns in the geologic media through which the seismic energy propagates. The National Institute for Occupational Safety and Health (NIOSH) is conducting research to improve the quality of the event locations contained in a seismic catalog produced by a surface network monitoring a deep underground...
Proceedings Papers

Paper presented at the 50th U.S. Rock Mechanics/Geomechanics Symposium, June 26–29, 2016
Paper Number: ARMA-2016-149
... Abstract: Accurate seismic event locations are essential for analysis of mining-induced seismicity. Complexities in the seismic velocity structure around coal mines, particularly changes in velocity caused by the progression of mining, can cause systematic event mislocations. Synthetic event...
Proceedings Papers

Paper presented at the 50th U.S. Rock Mechanics/Geomechanics Symposium, June 26–29, 2016
Paper Number: ARMA-2016-525
... expected PPV may be causing dilution of the ore or possible failure of the support in place on nearby access tunnels. All users want to get accurate seismic event locations from their system. This fundamental parameter is becoming more accurate as sites regularly calibrate and improve the accuracy...
Proceedings Papers

Paper presented at the 49th U.S. Rock Mechanics/Geomechanics Symposium, June 28–July 1, 2015
Paper Number: ARMA-2015-638
... event lower hemisphere step 80 event location rockmass reservoir characterization information metals & mining concentration seismicity orientation 1. INTRODUCTION Many current and future deposits are increasing in depth and reducing in grade. Combining this with many open pit mines...
Proceedings Papers

Paper presented at the 48th U.S. Rock Mechanics/Geomechanics Symposium, June 1–4, 2014
Paper Number: ARMA-2014-7530
... and straight raypath assumption. This improvement in accuracy is benefiting the integration of seismic results with numerical models and the overall effort to improve the safety and productivity in the rock mechanics industry. seismic event location complex block geology source mechanism solution...
Proceedings Papers

Paper presented at the 44th U.S. Rock Mechanics Symposium and 5th U.S.-Canada Rock Mechanics Symposium, June 27–30, 2010
Paper Number: ARMA-10-406
... ABSTRACT: Typical open-pit seismic monitoring applications attempt to assess the slip potential behind the rock face during a wall retreat. They employ sub-surface sensor arrays several hundreds of meters in size, localized within the respective wall, for which event locations can be obtained...
Proceedings Papers

Paper presented at the The 42nd U.S. Rock Mechanics Symposium (USRMS), June 29–July 2, 2008
Paper Number: ARMA-08-358
... of the roof gave in, forming a quasi-circular crater of almost 200 m in diameter and leading to the spill of 1.7 million m 3 of brine. zamfirescu variation Upstream Oil & Gas Brine correspond event location error microseismic monitoring cavern borehole Reservoir Characterization Ocnele...
Proceedings Papers

Paper presented at the The 42nd U.S. Rock Mechanics Symposium (USRMS), June 29–July 2, 2008
Paper Number: ARMA-08-344
.... In this paper, we adopt the Principal Component Analysis (PCA) method to interpret the microseismic data. machine learning Upstream Oil & Gas tilt data hydraulic fracturing dimension microseismic event application fracture geometry tiltmeter event location Artificial Intelligence Reservoir...
Proceedings Papers

Paper presented at the Golden Rocks 2006, The 41st U.S. Symposium on Rock Mechanics (USRMS), June 17–21, 2006
Paper Number: ARMA-06-1135
... Emission/Microseismic system was installed at the mine by the National Institute for Occupational Safety and Health (NIOSH). However, the efficiency of this system was severely hampered by high background noise and inaccurate event location. The focus of this research is therefore to resolve these problems...
Proceedings Papers

Paper presented at the Golden Rocks 2006, The 41st U.S. Symposium on Rock Mechanics (USRMS), June 17–21, 2006
Paper Number: ARMA-06-1156
... configuration, an event location accuracy of 8 to 10 m is achieved. Note that in case of caverns C11 and C12 the sensors are less evenly distributed due to lack of accessible locations by drilling equipment, resulting in somewhat lower location accuracy of events occurring in the region between the two caverns...
Proceedings Papers

Paper presented at the DC Rocks 2001, The 38th U.S. Symposium on Rock Mechanics (USRMS), July 7–10, 2001
Paper Number: ARMA-01-1321
... metals & mining US government Reservoir Characterization bump sandstone coal bump seismicity Castlegate strata velocity model event location normalized event location seismic event vertical view parallel seismic activity panel 2 Occupational Safety and Health seam longwall face...
Proceedings Papers

Paper presented at the Vail Rocks 1999, The 37th U.S. Symposium on Rock Mechanics (USRMS), June 7–9, 1999
Paper Number: ARMA-99-0991
... INTRODUCTION ABSTRACT: Temporal-spatial variations in event locations and in frequency-magnitude parameters (seismic activity level and b-value) are evaluated for a catalogue of 994 microseismic events (-1.9 _<M > -0.2) associated with the Cotton Valley (East Texas, USA) fracture...
Proceedings Papers

Paper presented at the The 35th U.S. Symposium on Rock Mechanics (USRMS), June 5–7, 1995
Paper Number: ARMA-95-0587
... and analysis system. A Ground Control Management System and an Automated Microseismic Monitoring System were previously developed by Bureau researchers, and both systems were jointly field tested in a western coal mine during 1993. Source energy distributions of microseisms were calculated with event locations...
Proceedings Papers

Paper presented at the The 34th U.S. Symposium on Rock Mechanics (USRMS), June 28–30, 1993
Paper Number: ARMA-93-0399
... and 59 mm for the entire array. Event locations outside of the array are very approximate at best. Focal mechanisms were determined for events that located within 0.75 m of the array centre and had at least eight clear polarity picks. Nodal planes were fit to the shear solutions assuming a double-couple...
Proceedings Papers

Paper presented at the The 32nd U.S. Symposium on Rock Mechanics (USRMS), July 10–12, 1991
Paper Number: ARMA-91-500
... bursts in a silver-copper mine in northern Idaho. One technique involves analyzing the degree of clustering of the event location pattern. The degree of spatial clustering, measured by the fractal dimension, changes before and after a rock burst for the stopes studied. The same technique can be applied...
Proceedings Papers

Paper presented at the The 32nd U.S. Symposium on Rock Mechanics (USRMS), July 10–12, 1991
Paper Number: ARMA-91-771
... mechanism microseismic system shaft underground research laboratory rock mass behaviour extensional strain plane microseismic data rock mass granite event location shear stress principal stress Rock Mechantcs as a Mulbd scipl nary Science, Roegiers (ed ) ¸ 1991 Balkema, Rotterdam. ISBN90 6191...

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