| Autor: |
S. K. Som, S. R. Basir, Ashim Kumar Saha, M.M. Swamy, Vijay Shivgotra, Anjan Rai Choudhuri |
| Rok vydání: |
2011 |
| Předmět: |
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| Zdroj: |
Journal of Asian Earth Sciences. 42:38-50 |
| ISSN: |
1367-9120 |
| DOI: |
10.1016/j.jseaes.2011.03.014 |
| Popis: |
We use campaign mode and continuous GPS data from 2005 to 2008 to examine the evolving strain pattern in Andaman Islands after the Great Sumatra–Andaman earthquake. Two and half years after the earthquake, the post-seismic period changes to inter-seismic period. At Port Blair, post-seismic displacement rate reduced to about 95% with clockwise rotation of azimuths and towards North Andaman, velocity vector gradually rotates towards north with drop in magnitude. The inter-seismic displacement was dominated by trench parallel movement. Strain calculations on inclined transpession model shows deformations at Andaman were highly heterogeneous both in post and inter-seismic periods with dominant strike-slip and dip-slip shearing along with layer parallel shortening and extension. Post-seismic and inter-seismic periods had suffered simultaneous subduction perpendicular extension and contraction leading to transtension and transpression deformational environments respectively. Occurrence of earthquakes during post and inter-seismic periods were results of interplay between simple shear and pure shear components of the strain matrix. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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