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Plate-boundary deformation associated with the great Sumatra–Andaman earthquake
Estimates of the ground displacement associated with the Sumatra–Andaman earthquake are reported, using near-field Global Positioning System surveys in northwestern Sumatra combined with in situ and remote observations of the vertical motion of coral reefs, to show that the earthquake was generated by rupture of the Sunda subduction megathrust over a distance of >1,500 kilometres and a width of <150 Kilometres.
Frictional Afterslip Following the 2005 Nias-Simeulue Earthquake, Sumatra
It is observed that the cumulative number of aftershocks increases linearly with postseismic displacements; this finding suggests that the temporal evolution ofAftershocks is governed by afterslip.
Deformation and Slip Along the Sunda Megathrust in the Great 2005 Nias-Simeulue Earthquake
Measurements from coral microatolls and Global Positioning System stations reveal trench-parallel belts of uplift up to 3 meters high on the outer-arc islands above the rupture and a 1-meter-deep subsidence trough farther from the trench.
Heterogeneous coupling on the Sumatra megathrust constrained from geodetic and paleogeodetic measurements
Geodetic and paleogeodetic measurements of interseismic strain above the Sumatran portion of the Sunda subduction zone reveal a heterogeneous pattern of coupling. Annual banding in corals provides…
Neotectonics of the Sumatran fault, Indonesia
The 1900-km-long, trench-parallel Sumatran fault accommodates a significant amount of the right-lateral component of oblique convergence between the Eurasian and Indian/Australian plates from 10°N to…
Partial rupture of a locked patch of the Sumatra megathrust during the 2007 earthquake sequence
It is shown that the same portion of a megathrust can rupture in different patterns depending on whether asperities break as isolated seismic events or cooperate to produce a larger rupture, as well as the influence of non-permanent barriers, zones with locally lower pre-stress due to the past earthquakes.
Source parameters of the great Sumatran megathrust earthquakes of 1797 and 1833 inferred from coral microatolls
Large uplifts and tilts occurred on the Sumatran outer arc islands between 0.5° and 3.3°S during great historical earthquakes in 1797 and 1833, as judged from relative sea level changes recorded by…
Earthquake Supercycles Inferred from Sea-Level Changes Recorded in the Corals of West Sumatra
Records of relative sea-level change extracted from corals of the Mentawai islands, Sumatra, imply that this 700-kilometer-long section of the Sunda megathrust has generated broadly similar sequences…
Uplift and subsidence associated with the great Aceh‐Andaman earthquake of 2004
Rupture of the Sunda megathrust on 26 December 2004 produced broad regions of uplift and subsidence. We define the pivot line separating these regions as a first step in defining the lateral extent…
Paleogeodetic records of seismic and aseismic subduction from central Sumatran microatolls, Indonesia
We utilize coral microatolls in western Sumatra to document vertical deformation associated with subduction. Microatolls are very sensitive to fluctuations in sea level and thus act as natural tide…