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Subduction in the Indo‐Burma Region: Is it still active?
Author(s) -
Satyabala S. P.
Publication year - 1998
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 - 10.1029/98gl02256
Subject(s) - subduction , geology , seismology , slab , induced seismicity , longitude , latitude , eclogitization , eurasian plate , episodic tremor and slip , geophysics , geodesy , tectonics , oceanic crust
The Indo‐Burma region (which includes longitude 92°–96°E, latitude 20°–26°N) is a subduction zone where the Indian plate underthrusts the South‐Eastern Asian plate. But the nature of subduction is complex. I examine here the distribution of the P, T and B axes of 37 earthquakes (the time period 1977–1995, depths 0–153 km and magnitudes m b 4.8–6.8) with respect to the geometry of the Wadati‐Benioif Zone. The analysis shows that the T axes are clustered close to the down‐dip direction of the subducting slab implying a predominant down‐dip tensional stress regime within the slab, which is typical of intermediate depth seismicity of active subduction zones. These results suggest that the subduction in the Indo‐Burma region is possibly active.