Evaluation of induced seismicity risk in the Pyhäsalmi mine

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Abstract

A Recent increase of induced seismicity and high rock stresses in the Pyhäsalmi mine have proven the need for an analysis of the seismic data and prediction of hazard. Seismic events and other influencing factors are analysed to forecast and quantify the level of induced seismicity risk in the Pyhäsalmi mine. The expected maximum event size is found by clustering seismic data using the Quality Threshold and Single Linkage clustering algorithms and applying the Gutenberg-Richter’s frequency-magnitude relationship.
Induced seismicity risk is assessed using the Quantitative Seismic Hazard and Risk Assessment Framework. The potential for induced seismicity is calculated as a function of the maximum local seismic magnitude, rock stresses and strength, local geology, excavation geometry, and ground support capacity. The exposure to the hazard is taken into account in order to quantify the level of risk. The assessment is performed on three mining levels at about 1.2 km depth, which are divided into assessment zones. Most of the assessment zones have a low seismic risk and only a few have an elevated potential of rockburst. The highest risk is found along the northern contact zone of ore and waste rock, adjacent to important mine infrastructure. The critical areas are identified and installation of ground support with increased dynamic capacity is recommended as a risk mitigation strategy.

Details

Original languageEnglish
Title of host publication7th International Symposium on In-Situ Rock Stress
Subtitle of host publicationSymposium proceedings
EditorsErik Johansson, Ville Raasakka
Publication statusPublished - May 2016
MoE publication typeA4 Article in a conference publication
EventInternational Symposium on In-Situ Rock Stress - Tampere Hall, Tampere, Finland
Duration: 10 May 201612 May 2016
Conference number: 7
http://www.ril.fi/en/events/rs2016/home.html

Publication series

NameRIL
PublisherSuomen rakennusinsinöörien liitto RIL
ISSN (Electronic)0356-9403

Conference

ConferenceInternational Symposium on In-Situ Rock Stress
Abbreviated titleRS2016 Symposium
CountryFinland
CityTampere
Period10/05/201612/05/2016
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    Research areas

  • Pyhäsalmi mine, risk assessment, mining induced seismicity, underground mining

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