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1 Department of Physics
University
of Colorado
Campus Box 390 UCB
Boulder, Colorado
80309-0390
(E.R.E.)
2 Institute of Earth Sciences
"Jaume Almera" — CSIC
Lluís Solé i
Sabarís s/n
08028 Barcelona, Spain
(A.V.)
3 Department of Geology and
Geophysics
University of Wisconsin–Madison
1215 W. Dayton
Street
Madison, Wisconsin 53706
(H.R.DS, C.H.T.)
The Mw 9.0 2004 Sumatra–Andaman Islands and
Mw 8.6 Nias Island
great earthquake sequences have generated over 5000 catalog-reported earthquakes
along 
1700 km of the Sumatra–Andaman and western Sunda regions.
Studies of
prior regional seismicity have been limited to global catalog locations that
often have
poorly constrained epicenters and depths. Approximately 3650 teleseismically
well-
recorded earthquakes occurring in this region during the period 1918–2005
are relocated
with special attention to focal depth. Reduced uncertainties of epicenters and
depths in the region (on the order of 15 and 10 km, respectively) foster
interpretation
of focal mechanism data and provide additional details about the subducting
Indian
and Australian plates. The revised earthquake dataset reveals a sharp
delineation
between aftershocks of the 2004 and 2005 earthquakes near Simeulue Island and a
steepening in slab dip from south to north. The downdip width of the aftershock
zone of the 2004 Mw 9.0 earthquake varies from 200 km
at its northern end to
275 km at its southern end, and events located between 35 and 70 km focal
depth
occur more frequently in the southernmost section of this aftershock zone.
Outer-
rise and near-trench normal and strike-slip faulting earthquakes also increase
in frequency
following the 2004 and 2005 earthquakes. Earthquake swarms triggered
along the Andaman backarc spreading center both north of Sumatra and near
Siberut
Island, 100 km south of the Nias Island aftershock sequence, illustrate the
complex
and variable nature of seismicity following these great earthquakes.
This article has been cited by other articles:
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  S. L. Bilek, K. Satake, and K. Sieh Introduction to the Special Issue on the 2004 Sumatra-Andaman Earthquake and the Indian Ocean Tsunami Bulletin of the Seismological Society of America, January 1, 2007; 97(1A): S1 - S5. [Full Text] [PDF]
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J. W. Dewey, G. Choy, B. Presgrave, S. Sipkin, A. C. Tarr, H. Benz, P. Earle, and D. Wald Seismicity Associated with the Sumatra-Andaman Islands Earthquake of 26 December 2004 Bulletin of the Seismological Society of America, January 1, 2007; 97(1A): S25 - S42. [Abstract] [Full Text] [PDF]
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O. P. Mishra, J. R. Kayal, G. K. Chakrabortty, O. P. Singh, and D. Ghosh Aftershock Investigation in the Andaman-Nicobar Islands of India and Its Seismotectonic Implications Bulletin of the Seismological Society of America, January 1, 2007; 97(1A): S71 - S85. [Abstract] [Full Text] [PDF]
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P. Banerjee, F. Pollitz, B. Nagarajan, and R. Burgmann Coseismic Slip Distributions of the 26 December 2004 Sumatra-Andaman and 28 March 2005 Nias Earthquakes from GPS Static Offsets Bulletin of the Seismological Society of America, January 1, 2007; 97(1A): S86 - S102. [Abstract] [Full Text] [PDF]
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J. Rhie, D. Dreger, R. Burgmann, and B. Romanowicz Slip of the 2004 Sumatra-Andaman Earthquake from Joint Inversion of Long-Period Global Seismic Waveforms and GPS Static Offsets Bulletin of the Seismological Society of America, January 1, 2007; 97(1A): S115 - S127. [Abstract] [Full Text] [PDF]
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T. Seno and K. Hirata Did the 2004 Sumatra-Andaman Earthquake Involve a Component of Tsunami Earthquakes? Bulletin of the Seismological Society of America, January 1, 2007; 97(1A): S296 - S306. [Abstract] [Full Text] [PDF]
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