Induced Seismicity of Kuznetsk Basin
Abstract
A natural seismicity of Kuznetsk Basin is confined in the main to mountain frame of Kuznetsk hollow. In this paper materials of experimental work with local station networks within sediment basin are presented. Different types of seismicity display within Kuznetsk hollow has been understood: first, man-caused seismic processes, confined to mine working and concentrated on depths up to one and a half of km; secondly, seismic activations on depths of 2-5 km, not coordinated in plan with coal mines; thirdly, induced seismicity in the neighborhood of strip mines. Every of studied seismic activations consists of large quantity of earthquakes of small powers (Ms=1-3). From one to first tens of earthquakes were recorded in a day. The earthquakes near mine working shift in space along with mine working, and seismic process become stronger at the instant a coal-plough machine is operated, and slacken at the instant the preventive works are executed. Uplift is the most typical focal mechanism. Activated zone near mine working reach in diameter 1-1,5 km. Today earthquakes happen mainly under mine working, though damages of working themselves do not happen, but intensive shaking on surface calls for intent study of so dangerous phenomena. Spatial-temporal changes of technogeneous activations not coordinated in plan with mine working are noted. A spatial displacement of activation along with mine working has been found. Trigger effects in progress of man-caused seismicity have been understood. It was demonstrated that industrial explosions in neighboring open-casts have no pronounced effect on seismic process near lavas. Stoppage of mole work in lavas leads to simultaneous changes in man-caused seismicity. The number of technogeneous earthquakes is lowered in several time, the earthquakes of small powers remain. Reactivation of lava coal production restores almost instantly the seismic behavior characteristics. Research of induced seismicity in area of "Raspadskaya" coal mine immediately after crash showed an existence of seismic activated zone, where four working lavas shifted from different sides. A fact of vibration effect at 500 m distance on characteristics of technogeneous seismicity in area of working lava has been experimentally determined. This fact allows to be relied on success in making of control method of technogeneous seismicity, what is important for working protection of coal production. The technogeneous seismicity in section area of 350 m depth and size of 3 km to 12 km has been studied. The strongest earthquake in the section area had magnitude 4. In whole a seismic energy of technogeneous earthquakes is in order less, than a seismic effect of industrial explosions in open cast. The recorded large event is rare, but dangerous phenomena. The largest coal basin of Siberia, disposed in zone of moderate natural activity, is situated in stress-strain state, and development of intensive induced seismicity accompanies coal production.
- Publication:
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AGU Spring Meeting Abstracts
- Pub Date:
- May 2013
- Bibcode:
- 2013AGUSM.S23A..02E
- Keywords:
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- 7215 SEISMOLOGY / Earthquake source observations