Authors / CoAuthors
Ghasemi, H. | Leonard, M. | Robinson, D. | Owen, K. | Horspool, N.
Abstract
After a main shock, the magnitude and timing of smaller aftershocks follow characteristic distributions known as Gutenberg-Richter and Omori laws, respectively. Based on these empirical laws, Reasenberg and Jones (1989) proposed a model to estimate the probability of earthquakes during an aftershock sequence as a function of time and magnitude. In this study, the parameters of the Reasenberg and Jones aftershock magnitude-time distribution are derived using the Australian instrumental earthquake catalogue (1900-2010). Two sets of model parameters are determined: sequence-specific parameters determined for well recorded aftershock sequences and generic parameters determined for a stack of events with magnitudes larger than or equal to 5. Both sets are found to be comparable to similar studies in other regions of the world. The spatial variation of model parameters is also studied and it is found that aftershock sequences in Southeastern Australia are less productive than sequences in Western Australia. Applicability of the derived generic parameters to forecast aftershock rates in Australia is verified using recent aftershock sequences that were not included in the earthquake catalogue such as the 2012 Gippsland earthquake.
Product Type
nonGeographicDataset
eCat Id
77025
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Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
ACT
2601
Australia
Keywords
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- External Publication
- Australian and New Zealand Standard Research Classification (ANZSRC)
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- Seismology and Seismic Exploration
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- Published_External
Publication Date
2013-01-01T00:00:00
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notPlanned
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geoscientificInformation
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Abstract for consideration by Australian Earthquake Engineering Society
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Spatial Resolution
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Source Information
Earthquake catalogue of Australia Earthquake catalogue of Australia