Estimates of coseismic displacement and post-seismic deformation using Global Positioning System geodesy for the Bhuj earthquake of 26 January 2001
IR@C-MMACS: CSIR-Centre for Mathematical Modelling and Computer Simulation, Bangalore
View Archive Info| Field | Value | |
| Title |
Estimates of coseismic displacement and post-seismic deformation using
Global Positioning System geodesy for the Bhuj earthquake of
26 January 2001
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| Creator |
Jade, Sridevi
Mukul, Malay Parvez, Imtiyaz A M B, Ananda P, Dileep Kumar Gaur, V K |
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| Subject |
Geosciences
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| Description |
The Mw = 7.6 Bhuj earthquake of 26 January 2001
that occurred in the Kachchh Rift Basin (KRB) was
felt over a wide area in the country. Global Positioning
System (GPS) measurements were made at
eleven sites in the epicentral area and at Jamnagar,
south of the KRB to estimate the total residual
displacements at these sites as a result of this earthquake.
During the survey, seven Great Trigonometrical
Survey (GTS) points (1857) were reoccupied
using GPS. An additional five GPS points were established
by C-MMACS for post-seismic studies. The
Jamnagar site was measured earlier in 1997 while
the seven GTS sites are those established during the
GTS, 144 years ago. Comparison of GPS (1997) and
GPS (2001) coordinates at Jamnagar gives the coseismic
displacement vector of 16 ± 8 mm at N35oE
for the four-year period (1997–2001); this is the only
GPS–GPS based estimate of coseismic slip of the
Bhuj earthquake. Comparison of GTS (1857) and
GPS (2001) coordinates at 7 GTS sites yields upper
bounds on the displacements suffered by these sites
as a result of the co-seismic slip of major events that
occurred in the intervening period. GTS (1857)–GPS
(2001) baselines oriented at low angles to the NNE–
SSW compression or transport direction have shortened
in length, while those oriented at high angles
have been elongated. The two epochs of measurements at the five GPS sites in KRB and Jamnagar
during February and July 2001, yield post-seismic
displacement rates averaging about 1 mm/month at
these sites. GPS (February 2001)–GPS (July 2001)
baselines, on the other hand, have shortened in
length irrespective of their orientation relative to the
NNE–SSW transport direction.
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| Publisher |
Indian Academy of Sciences.
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| Date |
2002-03-25
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| Type |
Article
PeerReviewed |
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| Format |
application/pdf
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| Identifier |
http://cir.cmmacs.ernet.in/25/1/curr%2Dsc%2D2002a.pdf
Jade, Sridevi and Mukul, Malay and Parvez, Imtiyaz A and M B, Ananda and P, Dileep Kumar and Gaur, V K (2002) Estimates of coseismic displacement and post-seismic deformation using Global Positioning System geodesy for the Bhuj earthquake of 26 January 2001. Current Science, 8 (6). pp. 748-752. ISSN 0011-3891 |
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| Relation |
http://www.ias.ac.in/currsci
http://cir.cmmacs.ernet.in/25/ |
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