Mechanism of mining-associated seismic events recorded at Driefontein - Sibanye gold mine in South Africa
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985530%3A_____%2F17%3A00488267" target="_blank" >RIV/67985530:_____/17:00488267 - isvavai.cz</a>
Result on the web
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DOI - Digital Object Identifier
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Alternative languages
Result language
angličtina
Original language name
Mechanism of mining-associated seismic events recorded at Driefontein - Sibanye gold mine in South Africa
Original language description
Mode of fracturing of the rock mass is the key point in rock mechanicsnapplied both to natural earthquakes foci and to sources of induced or triggerednseismic events. The parameter providing the answer is the source mechanism. Thenmoment tensor, currently used as a universal tool for descriptions of the mechanism,ninvolves general balanced dipole sources. However, in case of small-scale seismicnevents, the moment tensor need not be always reliably determined. In an effort to fitnthe data, there may be notable non-shear components caused by the low quality ofninput data. It means that while the orientation of the fracture is usually estimatednwell, the mode of fracturing itself may be dubious. Constraining the source model tondirectly determine a simpler one is convenient for describing the physical phenomenanexpected for a particular focus. An opening of new fractures can be described, to anfirst approximation, by a tensile crack, optionally combined with a shear slip. Such annalternativemodel is called a shear-tensile crack (STC) sourcemodel. The combinationnis practical, and can be used to both identify events that reflect purely mode-I (tensile)nfailure and to determine the dilation angle of the fracture undergoing shear. Thenadvantage of the STC is even enhanced in application to mining tremor foci, asnimplosion (i.e., tensile process with a negative sign) can be reasonably expectednthere as the consequence of collapsing mined-out cavities. From the technical pointnof view, the STC inversion is more robust than theMT one thanks to smaller numbernof the model parameters (5 vs. 6), which is crucial in cases of a poor monitoringnconfiguration.
Czech name
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Czech description
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Classification
Type
C - Chapter in a specialist book
CEP classification
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OECD FORD branch
10507 - Volcanology
Result continuities
Project
<a href="/en/project/GAP210%2F12%2F2235" target="_blank" >GAP210/12/2235: Constrained models of seismic source: in between a double-couple and moment tensor</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2017
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Book/collection name
Rock mechanics and engineering. Vol. 5. Surface and ungerground projects
ISBN
978-1-138-02763-3
Number of pages of the result
28
Pages from-to
349-376
Number of pages of the book
748
Publisher name
CRC Press
Place of publication
Boca Raton
UT code for WoS chapter
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