Transtension to transpression: A study of strain evolution in Andaman Islands based on GPS measurements following Great Sumatra–Andaman Earthquake, 2004

Som, S. K.; Choudhuri, Anjan Rai; Shivgotra, Vijay; Basir, Shaikh Rezaul; Saha, Ashim Kumar; Swamy, M.M.

doi:10.1016/j.jseaes.2011.03.014

Cited by 5 publications

(2 citation statements)

References 37 publications

(44 reference statements)

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“…This GPS network named AGNeSS (Aceh GPS Network for the Sumatran Fault System) (Ito et al 2012;Gunawan et al 2014). Previous studies suggested that there are ongoing postseismic activities due to the 2004 SumatraAndaman earthquake with the movement of 5-15 cm per year observed in the Andaman Islands (e.g., Som et al 2011Som et al , 2014, and also in Thailand (e.g., Panet et al 2010). Furthermore, Gunawan et al (2014) suggested that postseismic deformation in the long-term period after earthquake occurrences corresponds to viscous flow in the asthenosphere.…”

Section: Introductionmentioning

confidence: 99%

Estimation of postseismic deformation parameters from continuous GPS data in northern Sumatra after the 2004 Sumatra-Andaman earthquake

et al. 2015

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Continuous global positioning system (GPS) in northern Sumatra detected signal of the ongoing physical process of postseismic deformation after the M9.2 2004 Sumatra-Andaman earthquake. We analyze the characteristics of postseismic deformation of the 2004 earthquake based on GPS networks operated by BIG, and the others named AGNeSS, and SuGAr networks located in northern Sumatra. We use a simple analytical logarithmic and exponential function to evaluate the postseismic deformation parameters of the 2004 earthquake. We find that GPS data in northern Sumatra during time periods of 2005-2012 are fit better using the logarithmic function with slog of 104.2 ± 0.1 than using the exponential function. Our result clearly indicates that other physical mechanisms of postseismic deformation should be taken into account rather than a single physical mechanism of afterslip only.

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Section: Introductionmentioning

confidence: 99%

Estimation of postseismic deformation parameters from continuous GPS data in northern Sumatra after the 2004 Sumatra-Andaman earthquake

et al. 2015

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“…At Andaman, just after the SumatraÀAndaman earthquake, the sites continued to move in the same direction of coseismic displacement, towards SW or WSW (Gahalaut et al 2006;Paul et al 2007). It is shown that post-seismic deformation continued till two and a half years after the earthquake and entered into inter-seismic period due to simultaneous subduction perpendicular extension and contraction leading to transtension and transpression deformational environments, respectively (Som et al 2011;Som et al 2014).…”

Section: Tectonics Present Crustal Motions and Earthquake Generationmentioning

confidence: 92%

Slab tear and tensional fault systems in the Sunda–Andaman Benioff zone: implications on tectonics and potential seismic hazard

Mukhopadhyay

Dasgupta

Mukherjee

2015

Geomatics, Natural Hazards and Risk

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Transverse slab tear faults and longitudinal trench parallel extensional faults present on the top part of Benioff zone in SundaÀAndaman arc between latitude 6 À15 N and longitude 90 À98 E are marked by seismotectonic analysis using contemporary data related to regional tectonics, seismicity, centroid moment tensor (CMT) fault plane solutions, etc. Characteristics of ten numbers of transverse slab tear faults is taken from our previous studies, whereas four numbers of longitudinal trench parallel extensional faults are marked by the present study. These two sets of fault systems make high angle between them and tectonically complement each other. The disposition, origin, tectonic framework, depth of penetration and seismotectonic evaluations of the fault systems are analyzed. An effort is made to identify the potential seismic hazard in the zone between trench and forearc containing Andaman Group of Island.

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Post-2004 mega-earthquake temporal velocity variation at Andaman Islands from GPS measurements

2014

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Transtension to transpression: A study of strain evolution in Andaman Islands based on GPS measurements following Great Sumatra–Andaman Earthquake, 2004

Cited by 5 publications

References 37 publications

Estimation of postseismic deformation parameters from continuous GPS data in northern Sumatra after the 2004 Sumatra-Andaman earthquake

Estimation of postseismic deformation parameters from continuous GPS data in northern Sumatra after the 2004 Sumatra-Andaman earthquake

Slab tear and tensional fault systems in the Sunda–Andaman Benioff zone: implications on tectonics and potential seismic hazard

Post-2004 mega-earthquake temporal velocity variation at Andaman Islands from GPS measurements

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