With the aim of delineating the subducting Indian Plate beneath the Burma Plate, we have relocated earthquakes by employing teleseismic P-wave arrival times. We were able to obtain the detailed geometry of the subducting Indian Plate by constructing iso-depth contours for the subduction earthquakes at depths of 30-140 km. The strikes of the contours are oriented approximately N-S, and show an "S" shape in map view. The strike of the slab is N20°E at 25°N, but moving southward, the strike rotates counterclockwise to N20°W at 20°N, followed by a clockwise rotation to a strike of N10°E at 17.5°N, where slab earthquakes no longer occur. The plate boundary north of 20°N might exist near, or west, of the coast line of Myanmar. The mechanisms of subduction earthquakes are down-dip extension, and T axes are oriented parallel to the local dip of the slab. Subcrustal seismicity occurs at depths of 20-50 km in the Burma Plate. This activity starts near the 60-km-depth contour of the subduction earthquakes and becomes shallower toward the Sagaing Fault, indicating that this fault is located where the cut-off depth of the seismicity becomes shallower. Copyright © The Society of Geomagnetism and Earth, Planetary and Space Sciences (SGEPSS).
CITATION STYLE
Hurukawa, N., Tun, P. P., & Shibazaki, B. (2012). Detailed geometry of the subducting Indian Plate beneath the Burma Plate and subcrustal seismicity in the Burma Plate derived from joint hypocenter relocation. Earth, Planets and Space, 64(4), 333–343. https://doi.org/10.5047/eps.2011.10.011
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