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Spatial and temporal characteristics of aftershocks of the December 26, 2004 and March 28, 2005 earthquakes off NW Sumatra
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Geophysics.
2012 (English)In: Journal of Asian Earth Sciences, ISSN 1367-9120, Vol. 46, 150-160 p.Article in journal (Refereed) Published
Abstract [en]

Two aftershock series following the December 26, 2004 (M-w = 9.0) and the March 28, 2005 (M-w = 8.6) earthquakes off coast of NW Sumatra are studied. Deduced space heterogeneity of b-values, in the Gutenberg-Richter formula, and p-values, in the Omori law, show significant variations. General agreement is found between areas of high b and areas of significant slip predicted by different source models presented by other workers. Correlation with high p-values does exist, however, is less pronounced. The largest aftershocks occur during or near time periods when b-values reach their local minima. To examine the stability of results, two global earthquake catalogues (ISC and NEIC), different threshold magnitudes, moving-window lengths and moving steps were employed. The presented b- and p-distributions exhibit high confidence levels.

Place, publisher, year, edition, pages
2012. Vol. 46, 150-160 p.
Keyword [en]
b-value, p-value, Aftershock, Sumatra earthquake, Threshold magnitude, Earthquake prediction
National Category
Earth and Related Environmental Sciences
URN: urn:nbn:se:uu:diva-176907DOI: 10.1016/j.jseaes.2011.12.004ISI: 000304513800012OAI: oai:DiVA.org:uu-176907DiVA: diva2:537960
Available from: 2012-06-28 Created: 2012-06-27 Last updated: 2012-06-28Bibliographically approved

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