GPS measurements of postseismic deformation in the Andaman- Nicobar region following the giant 2004 Sumatra-Andaman earthquake
IR@C-MMACS: CSIR-Centre for Mathematical Modelling and Computer Simulation, Bangalore
View Archive Info| Field | Value | |
| Title |
GPS measurements of postseismic deformation in the Andaman-
Nicobar region following the giant 2004 Sumatra-Andaman
earthquake
|
|
| Creator |
Jade, Sridevi
M B, Ananda P, Dileep Kumar |
|
| Subject |
Global Positioning System
|
|
| Description |
We report GPS measurements of postseismic deformation from 22 campaign-mode
and one continuous GPS sites in the Andaman-Nicobar region following the great
Sumatra-Andaman earthquake of 26 December 2004. Large horizontal displacements
toward west to southwest, varying in magnitude from 10 to 40 cm, and with uplift
reaching 16 cm, occurred in the region in the first year after the earthquake. The observed
motion decreased logarithmically in the subsequent year. We suggest that in the
Andaman region, frictional afterslip occurred farther downdip of the coseismic rupture,
while in the Little Andaman and Nicobar regions, the coseismic rupture and afterslip patch
partly overlapped. The afterslip was mostly aseismic and did not contribute to the
aftershocks. The aftershocks and postseismic displacements appear to follow a similar
relationship, although with different decay times. The temporal dependence of the two
differs only by a term linear in time. Thus the temporal evolution of the afterslip seems to
be consistent with a mechanism governed by frictional afterslip. Available rates of
interseismic and postseismic deformation and coseismic static offsets allow us to
approximately estimate a return period of about 400 years for great earthquakes in the
Andaman region.
|
|
| Publisher |
American Geophysical Union
|
|
| Date |
2008-08-01
|
|
| Type |
Article
PeerReviewed |
|
| Format |
application/pdf
|
|
| Identifier |
http://cir.cmmacs.ernet.in/137/1/gahalaut_jgr08.pdf
Jade, Sridevi and M B, Ananda and P, Dileep Kumar (2008) GPS measurements of postseismic deformation in the Andaman- Nicobar region following the giant 2004 Sumatra-Andaman earthquake. JOURNAL OF GEOPHYSICAL RESEARCH,, 113 (B08401). pp. 1-18. |
|
| Relation |
http://www.agu.org/journals
http://cir.cmmacs.ernet.in/137/ |
|