Pre-seismic, co-seismic and post-seismic displacements associated with the Bhuj 2001 earthquake derived from recent and historic geodetic data

Pre-seismic, co-seismic and post-seismic displacements associated with the Bhuj 2001 earthquake derived from recent and historic geodetic data

The 26th January 2001 Bhuj earthquake occurred in the Kachchh Rift Basin which has a long history of major earthquakes. Great Triangulation Survey points (GTS) were first installed in the area in 1856–60 and some of these were measured using Global Positioning System (GPS) in the months of February...

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Bibliographic Details
Published in:Academy Proceedings in Earth and Planetary Sciences Vol. 112; no. 3; pp. 331 - 345
Main Authors: JADE, Sridevi, MUKUL, M, ABBASI, I. A, ASIF KHAN, M, ULHADI, S, PARVEZ, I. A, ANANDA, M. B, KUMAR, P. D, GAUR, V. K, BENDICK, R, BILHAM, R, BLUME, F, WALLACE, K
Format: Conference Proceeding Journal Article
Language:English
Published: Bangalore Indian Academy of Sciences 01-09-2003
Springer Nature B.V
Subjects:
Deformation
Displacement
Earth sciences
Earth, ocean, space
Earthquakes
Earthquakes, seismology
Exact sciences and technology
Global positioning systems
GPS
Internal geophysics
Positioning systems
Seismic activity
Solid-earth geophysics, tectonophysics, gravimetry
Strain
Triangulation
Kathiawar
Gujarat India
Cutch India
India
strain
triangulation
history
epicenters
earthquakes
rupture
Global Positioning System
Asia
slip
positioning
displacements
fault displacements
contraction
geodesy
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Summary:The 26th January 2001 Bhuj earthquake occurred in the Kachchh Rift Basin which has a long history of major earthquakes. Great Triangulation Survey points (GTS) were first installed in the area in 1856–60 and some of these were measured using Global Positioning System (GPS) in the months of February and July 2001. Despite uncertainties associated with repairs and possible reconstruction of points in the past century, the re-measurements reveal pre-seismic, co-seismic and post-seismic deformation related to Bhuj earthquake. More than 25 Μ-strain contraction north of the epicenter appears to have occurred in the past 140 years corresponding to a linear convergence rate of approximately 10 mm/yr across the Rann of Kachchh. Motion of a single point at Jamnagar 150 km south of the epicenter in the 4 years prior to the earthquake, and GTS-GPS displacements in Kathiawar suggests that pre-seismic strain south of the epicenter was small and differs insignificantly from that measured elsewhere in India. Of the 20 points measured within 150 km of the epicenter, 12 were made at existing GTS points which revealed epicentral displacements of up to 1 m, and strain changes exceeding 30 Μ-strain. Observed displacements are consistent with reverse co-seismic slip. Re-measurements in July 2001 of one GTS point (Hathria) and eight new points established in February reveal post-seismic deformation consistent with continued slip on the Bhuj rupture zone.
ISSN:0253-4126
0973-774X
DOI:10.1007/BF02709260