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Postseismic deformation of the Andaman Islands



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Click Here GEOPHYSICAL RESEARCH LETTERS VOL 34 L19309 doi 10 1029 2007GL031024 2007 for Full Article Postseismic deformation of the Andaman Islands following the 26 December 2004 Great Sumatra Andaman earthquake J Paul 1 A R Lowry 2 R Bilham 3 S Sen 4 and R Smalley Jr 1 Received 20 June 2007 revised 20 August 2007 accepted 5 September 2007 published 13 October 2007 1 Two years after the Great Sumatra Andaman earthquake the 3 1 m WSW coseismic displacement at Port Blair Andaman Islands had increased by 32 cm Postseismic uplift initially exceeded 1 cm per week and decreased to 1 mm week By 2007 points near Port Blair had risen more than 20 cm a 24 reversal of coseismic subsidence Uplift at eight GPS sites suggests a gradual eastward shift of the coseismic neutral axis separating subsidence from uplift Simulations of the GPS postseismic displacements as viscoelastic relaxation of coseismic stress change and as slip on the plate interface indicate that slip down dip of the seismic rupture dominates near field deformation during the first two years Postseismic slip beneath the Andaman Islands released moment equivalent to a magnitude Mw 7 5 earthquake and the distribution suggests deep slip in the stable frictional regime accelerated to catch up to the coseismic rupture Citation Paul J A R Lowry R Bilham S Sen and R Smalley Jr 2007 Postseismic deformation of the Andaman Islands following the 26 December 2004 Great Sumatra Andaman earthquake Geophys Res Lett 34 L19309 doi 10 1029 2007GL031024 1 Introduction 2 The December 26th 2004 Mw 9 3 SumatraAndaman earthquake ruptured 1600 km of subduction thrust at the east boundary of the Indian plate In addition to several meters of southwestward coseismic displacement Figure 1 inset Global Positioning System GPS instruments measured 60 cm of coseismic uplift at Diglipur in the Northern Andaman Islands 84 cm subsidence at Port Blair 7 cm subsidence at Havelock island and 34 cm uplift at Hut Bay Freymueller et al 2007 Remote



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