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Point process modelling of reservoir-induced seismicity

Part of: Stochastic processes Geophysics Geophysics (general)

Published online by Cambridge University Press:  14 July 2016

Masajiro Imoto
Masajiro Imoto*
Affiliation:
National Research Institute for Earth Science and Disaster Prevention, Japan
*
1Postal address: National Research Institute for Earth Science and Disaster Prevention, 3–1 Ten'nodai, Tsukuba-shi, Ibaraki-ken, 305–0006, Japan. Email: [email protected]
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Abstract

A point process procedure can be used to study reservoir-induced seismicity (RIS), in which the intensity function representing earthquake hazard is a combination of three terms: a constant background term, an ETAS (epidemic-type aftershock sequence) term for aftershocks, and a time function derived from observation of water levels of a reservoir. This paper presents the results of such a study of the seismicity in the vicinity of the Tarbela reservoir in Pakistan. Making allowance for changes in detection capability and the background seismicity related to tectonic activity, earthquakes of magnitude ≥ 2.0, occurring between May 1978 and January 1982 and whose epicentres were within 100 km of the reservoir, were used in this analysis. Several different intensities were compared via their Akaike information criterion (AIC) values relative to those of a Poisson process. The results demonstrate that the seismicity within 20 km of the reservoir correlates with water levels of the reservoir, namely, active periods occur about 250 days after the appearance of low water levels. This suggests that unloading the reservoir activates the seismicity beneath it. Seasonal variations of the seismicity in an area up to 100 km from the reservoir were also found, but these could not be adequately interpreted by an appropriate RIS mechanism.

Keywords

Induced seismicitypoint processETAS modelRISTarbela reservoir

MSC classification

Primary: 86A15: Seismology
Secondary: 60G55: Point processes
Type
Models and statistics in seismology
Information
Journal of Applied Probability , Volume 38 , Issue A: Probability, Statistics and Seismology , 2001 , pp. 232 - 242
Copyright
Copyright © Applied Probability Trust 2001 

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