Observations of Mine Seismicity in the Eastern Wasatch Plateau, Utah, U.S.A.: A Possible Case of Implosional Failure

Wong, Ivan G.; Humphrey, James R.; Adams, Janet A.; Silva, Walter J.

doi:10.1007/978-3-0348-9270-4_7

Cited by 2 publications

(2 citation statements)

References 16 publications

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“…The source spectral models of BRUNE (1970) and MADARIAGA (1976) have been widely used in mining-induced seismicity for estimating source size, stress drop and fault slip (MCGARR et al, 1989;GIBOWICZ et al, 1991;MCGARR, 1992b;URBANCIC and YOUNG, 1993;KNOLL et al, 1996). However, the application of such models in the mining environments must be done with caution, because the presence of mechanisms with explosive or implosive components are not excluded (Š ÍLENÝ , 1989;WONG et al, 1989;GIBOWICZ et al, 1991;MCGARR, 1992a). Furthermore, it was found that source sizes extracted from such models are sometimes too large compared to areas affected by rockbursts in mines (GIBOWICZ et al, 1991;CAI et al, 1998).…”

Section: Source Analysismentioning

confidence: 99%

Induced Seismicity Monitoring of an Underground Salt Cavern Prone to Collapse

Mercerat

Driad-Lebeau

Bernard

2009

Pure Appl. Geophys.

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Within the framework of a large research project launched to assess the feasibility of microseismic monitoring of growing underground caverns, this specific work focuses on the analysis of the induced seismicity recorded in a salt mine environment. A local seismic network has been installed over an underground salt cavern located in the Lorraine basin (Northeast of France). The microseismic network includes four 3-components and three single component geophones deployed at depths between 30 and 125 m in cemented boreholes drilled in the vicinity of the study area. The underground cavern under monitoring is located within a salt layer at 180 m depth and it presents a rather irregular shape that can be approximated by a cylindrical volume of 50 m height and 180 m diameter. Presently, the cavern is full of saturated brine inducing a significant pressure on its walls (*2.0 MPa) to keep the overburden mechanically stable. Nevertheless some small microseismic events were recorded by the network and analyzed (approximately 2,000 events in 2 years of recording). In October 2005 and April 2007, two controlled pressure transient experiments were carried out in the cavern, in order to analyze the mechanical response of the overburden by tracking the induced microseismicity. The recorded events were mainly grouped in clusters of 3-30 s of signal duration with emergent first arrivals and rather low frequency content (between 20 and 120 Hz). Some of these events have been spatially located by travel-time picking close to the actual cavern and its immediate roof. Preliminary spectral analysis of isolated microearthquakes suggests sources with non-negligible tensile components possibly related to fluid-filled cracks. Rockdebris falling into the cavern from delamination of clay marls in the immediate roof is probably another source of seismic excitation. This was later confirmed when the most important seismic swarms occurred at the site during May 2007, accompanied by the detachment of more than 8 9 10 4 m 3 of marly material on top of the cavern roof. In any case, no clear evidence of classical brittle ruptures in the most competent layers of the overburden has been observed during the analyzed period. Current work is focused on the discrimination of all these possible mechanisms to better understand the damage processes in the cavern overburden and to assess its final collapse hazard.

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Section: Source Analysismentioning

confidence: 99%

Induced Seismicity Monitoring of an Underground Salt Cavern Prone to Collapse

Mercerat

Driad-Lebeau

Bernard

2009

Pure Appl. Geophys.

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“…The source mechanisms associated with this seismicity are often shear-implosional events dominated by compensated linear-vector dipoles (CLVDs). However, certain source mechanisms are determined to be double-couple shear events that are indistinguishable from tectonic earthquakes (Williams and Arabasz 1989, Wong et al 1989, Arabasz et al 2005). These frequent and predictable seismic events, combined with the rugged topography of the East Mountain region, make the area an excellent location for studying the effects of topography on seismic GMs.…”

Section: Study Area and Supporting Datamentioning

confidence: 99%

Experimental Data Set of Mining-Induced Seismicity for Studies of Full-Scale Topographic Effects

Wood

Cox

2015

Earthquake Spectra

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This paper describes two large, high-quality experimental data sets of ground motions collected with locally dense arrays of seismometers deployed on steep mountainous terrain with varying slope angles and topographic features. These data sets were collected in an area of central-eastern Utah that experiences frequent and predictable mining-induced seismicity as a means to study the effects of topography on small-strain seismic ground motions. The data sets are freely available through the George E. Brown, Jr. Network for Earthquake Engineering Simulation data repository ( NEEShub.org ) under the DOI numbers 10.4231/D34M9199S and 10.4231/D3Z31NN4J. This paper documents the data collection efforts and metadata necessary for utilizing the data sets, as well as the availability of supporting data (e.g., high-resolution digital elevation models). The paper offers a brief summary of analyses conducted on the data sets thus far, in addition to ideas about how these data sets may be used in future studies related to topographic effects and mining seismicity.

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Observations of Mine Seismicity in the Eastern Wasatch Plateau, Utah, U.S.A.: A Possible Case of Implosional Failure

Cited by 2 publications

References 16 publications

Induced Seismicity Monitoring of an Underground Salt Cavern Prone to Collapse

Induced Seismicity Monitoring of an Underground Salt Cavern Prone to Collapse

Experimental Data Set of Mining-Induced Seismicity for Studies of Full-Scale Topographic Effects

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