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| Titel |
Transient postseismic mantle relaxation following 2004 Sumatra earthquake: implications of seismic vulnerability in the Andaman-Nicobar region |
| VerfasserIn |
C. D. Reddy, S. K. Prajapati, P. S. Sunil, S. K. Arora |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 12, no. 2 ; Nr. 12, no. 2 (2012-02-27), S.431-441 |
| Datensatznummer |
250010512
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| Publikation (Nr.) |
 copernicus.org/nhess-12-431-2012.pdf |
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| Zusammenfassung |
| Throughout the world, the tsunami generation potential of some large
under-sea earthquakes significantly contributes to regional seismic hazard,
which gives rise to significant risk in the near-shore provinces where human
settlements are in sizeable population, often referred to as coastal seismic
risk. In this context, we show from the pertinent GPS data that the
transient stresses generated by the viscoelastic relaxation process taking place
in the mantle is capable of rupturing major faults by stress transfer from
the mantle through the lower crust including triggering additional rupture
on the other major faults. We also infer that postseismic relaxation at
relatively large depths can push some of the fault segments to reactivation
causing failure sequences. As an illustration to these effects, we consider
in detail the earthquake sequence comprising six events, starting from the
main event of Mw = 7.5, on 10 August 2009 and tapering off to a small
earthquake of Mw = 4.5 on 2 February 2011 over a period of eighteen
months in the intensely seismic Andaman Islands between India and Myanmar.
The persisting transient stresses, spatio-temporal seismic pattern, modeled
Coulomb stress changes, and the southward migration of earthquake activity
has increased the probability of moderate earthquakes recurring in the northern
Andaman region, particularly closer to or somewhat south of Diglipur. |
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