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Slow slip below Port Blair, Andaman, during the great Sumatra‐Andaman earthquake of 26 December 2004
Author(s) -
Singh S. K.,
Ortiz M.,
Gupta H. K.,
Ramadass D. G. A.
Publication year - 2006
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2005gl025025
Subject(s) - slip (aerodynamics) , geology , seismology , epicenter , episodic tremor and slip , tide gauge , geodesy , global positioning system , subduction , tectonics , sea level , oceanography , physics , thermodynamics , telecommunications , computer science
Although several studies suggest that a slow slip followed the seismic slip on the northern half of the 1300‐km long plate interface that ruptured during the great Sumatra‐Andaman earthquake, the onset and duration of the slow slip remain unresolved. In this paper we analyze a tide gauge record at Port Blair, situated about 1000 km north of the epicenter. Our preferred model, which fits the observed data well, consists of a mixed mode of slip: ∼half of the total slip occurring seismically in less than 5 min after the rupture arrival and the rest developing in the next 30 min. A scenario of slow slip on the northern half of the rupture area, that is consistent with seismic data, and GPS data, consists of slip on the time scale of <35 min over some parts of the fault, such as below Port Blair, and > 1 hour over the rest.