Rapid assessment of the spatial extent of strong ground motion in mines – ShakeMap approach

Authors: Meyer, S; Doolan, J; Chester, C; Basson, G

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DOI https://doi.org/10.36487/ACG_rep/1815_41_Meyer

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Meyer, S, Doolan, J, Chester, C & Basson, G 2018, 'Rapid assessment of the spatial extent of strong ground motion in mines – ShakeMap approach', in Y Potvin & J Jakubec (eds), Caving 2018: Proceedings of the Fourth International Symposium on Block and Sublevel Caving, Australian Centre for Geomechanics, Perth, pp. 533-544, https://doi.org/10.36487/ACG_rep/1815_41_Meyer

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Abstract:
Rapid assessment of areas that may experience damage during large seismic events is an important task of seismic monitoring in rockburst-prone mines, particularly in the seconds to hours following the event. Correctly installed sensors of the appropriate type allow instantaneous and accurate measurement at the location of the sensor. However, the ground motion at any point in the mine could be of interest. Traditionally, this assessment at locations away from sensors was estimated using ground motion prediction equations (GMPEs); specially calibrated equations describing the relationship between ground motion, event strength (radiated seismic energy or seismic potency) and distance. However, the uncertainty in these equations is often quite significant due to complexity of the problem, e.g. radiation pattern effects, extended seismic sources, variations in attenuation characteristics, and uncertainty in source parameters. We improve the accuracy of these estimations by combining the measurements at sensors with a GMPE in an approach known as ShakeMap, popular in crustal seismology. This allows for rapid and more accurate estimation of ground motions at any location following a large event. This knowledge can play an important role in planning of potential post-event evacuation operations and damage assessments. The method is demonstrated on examples from an Australian sublevel caving mine.

Keywords: ground motion, ShakeMap, GMPE, seismicity, seismic damage

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