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Keywords: seismicity
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Proceedings Papers

Paper presented at the 58th U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2024
Paper Number: ARMA-2024-0448
... ABSTRACT: Seismic monitoring is a useful tool in understanding the rockmass response to mining. The waveforms recorded by sensors contain information not only about where and when a seismic event occurred but also about the driving stresses, failure mechanism and the intervening rockmass...
Proceedings Papers

Paper presented at the 58th U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2024
Paper Number: ARMA-2024-0405
... understood and difficult to capture. However, these mechanisms are crucial drivers for earthquakes, including induced seismicity. Here we observe these micro-mechanisms directly by controlling the rate of micro-seismic events to slow down the transition in a unique triaxial deformation apparatus...
Proceedings Papers

Paper presented at the 58th U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2024
Paper Number: ARMA-2024-0524
... ABSTRACT: The Malmberget iron ore mine owned by LKAB (Sweden) is one of the largest iron underground mines in the world. At present 10 orebodies are being mined, with seismicity being a known issue for several of them. The seismic system consists of 143 geophones, of which 36% are triaxial...
Proceedings Papers

Paper presented at the 58th U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2024
Paper Number: ARMA-2024-0497
... ABSTRACT: Induced seismicity is a major unsolved challenge that stands in the way of harnessing geothermal energy to its fullest extent. To confront this problem, fracture caging was proposed; where pre-drilled boundary wells are placed around an injection zone to contain fluid and limit...
Proceedings Papers

Paper presented at the 58th U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2024
Paper Number: ARMA-2024-0502
... reactivated in the three other intervals. Reactivation pressures from pressure-flow rate plots agree with the pressures encountered at the onset of seismicity. Given that the prevailing fractures are well oriented for shear reactivation within the far field stress field, hydraulic shearing is considered...
Proceedings Papers

Paper presented at the 58th U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2024
Paper Number: ARMA-2024-0530
... ABSTRACT: Seismic monitoring data acquired at mines can be used to infer the characteristics of coseismic strain, including amount, orientation of principal directions and type (deviatoric, volumetric explosive or implosive). This strain corresponds to plastic strain increment if seismic...
Proceedings Papers

Paper presented at the 58th U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2024
Paper Number: ARMA-2024-0557
... depth, it is surmised that the pressure plume reached previously unidentified basement faults, altered their stress conditions, and triggered microseismic events. Understanding the presence and behavior of basement faults is critical for monitoring and managing induced seismic risks. However, basement...
Proceedings Papers

Paper presented at the 58th U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2024
Paper Number: ARMA-2024-0686
... is capable of triggering large earthquakes that can cause major damage to surface infrastructure. Understanding the linkage between fluid-injection volume or injection rate and seismic moment is essential in safeguarding such infrastructure. We report shear experiments that specifically explore the link...
Proceedings Papers

Paper presented at the 58th U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2024
Paper Number: ARMA-2024-0670
... ABSTRACT: Seismic events and rockbursts are recurrent geotechnical hazards in deep underground mines with significant levels of stress and extraction. These hazards can be manageable if adequately addressed during the design and monitoring phase. However, changes in the geological boundaries...
Proceedings Papers

Paper presented at the 58th U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2024
Paper Number: ARMA-2024-0785
... ABSTRACT: Seismic monitoring systems have long been identified as a key tool for engineers to observe, quantify, and manage the seismic rockmass response to mining. The design of the seismic system, in terms of sensor layout, spacing, and type, is an important first step and is dependent...
Proceedings Papers

Paper presented at the 58th U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2024
Paper Number: ARMA-2024-0774
.... The induced seismicity serves as proxy for the enhanced fracture network's spatial extent, but at the same time could pose a risk to nearby populations if the earthquakes' magnitude is large. To address this challenge, understanding the coupled physical processes generating fault reactivation and seismicity...
Proceedings Papers

Paper presented at the 58th U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2024
Paper Number: ARMA-2024-0813
... magnitudes of fluid pressure, P p , and critical pore fluid pressure, P crit , which is the magnitude of pore pressure above which Coulomb failure triggers seismicity. The scenario was based on three sets of observations and inferences associated with the 20-hour shutdown in December 2016 during which...
Proceedings Papers

Paper presented at the 58th U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2024
Paper Number: ARMA-2024-0037
... chlorite content. Our results have important implications in understanding the frictional stability of epidote/chlorite-filled granite faults and its influence on seismicity in deep geothermal reservoirs inhabiting the shallow crust. 1. INTRODUCTION The moment magnitude ( M w ) 5.5 Pohang earthquake...
Proceedings Papers

Paper presented at the 58th U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2024
Paper Number: ARMA-2024-0054
... that had to go through the fault, conservative ground control measures were employed. This resulted in a significant risk reduction and improved operator safety associated with the construction of the critical excavations. Seismic data were collected while mining through this area, and the data confirmed...
Proceedings Papers

Paper presented at the 58th U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2024
Paper Number: ARMA-2024-0067
... of the ground conditions, leading to a 50% reduction in seismic activity and rockburst risk, and no bowling of the station floor. The outcomes not only resulted in cost savings but also provided valuable insights into the geotechnical intricacies and excavation strategies essential for safe mining operations...
Proceedings Papers

Paper presented at the 58th U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2024
Paper Number: ARMA-2024-1043
... to future CCS implementations. We reviewed PWRI operations in 3 major petroleum basins. We then compared their geological and geomechanical settings, PWRI data, and induced seismicity. The most prominent impact is induced seismicity, as others have shown, the cause being the increase of pore pressure...
Proceedings Papers

Paper presented at the 58th U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2024
Paper Number: ARMA-2024-1106
... ABSTRACT: Vale's Coleman Mine, an underground mining operation initiated in 1970, is renowned for producing nickel, copper, and precious metals. Situated approximately 45 km northeast of Sudbury, Ontario, this mine is seismically active and has encountered seismic events with a local magnitude...
Proceedings Papers

Paper presented at the 58th U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2024
Paper Number: ARMA-2024-1068
... ABSTRACT: Geothermal energy exploration and production has a long history of inducing seismicity, both beneficial and disastrous. Seismicity is common in naturally occurring geothermal systems as they often are co-located in areas with high strain rates, low permeability but fractured rocks...

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