Tectonic Stress Field in the Indo-Burma Range

Stress inversion results. (A) Studied earthquakes from GCMT and ISC. The events are divided to 6 groups based on their focal depths. (B) Principal stress orientation results. (C) Relationship between average slab dip angles and plunges of minimum principal stresses.

Project Summary The Indo-Burma Range (IBR), was formed due to the India-Eurasia collision since the Paleogene, is a highly oblique subduction zone. The dominance of observed strike-slip and intra-slab earthquakes brings into question the current activity of subduction in the IBR. In this study, we aim to (1) investigate the stress field in the IBR to understand plate driving forces and subduction dynamics and (2) improve the velocity structure model for studying mechanisms of events in this region. The results show that there is an E-W downdip tension along the Indian slab, consistent with the dip direction of the SLAB 2.0 plate interface, suggesting that slab pull is the dominant force. The observation of a N-S maximum compressive stress orientation is consistent with the characteristics of the oblique subduction zone.

Tools STRESSINVERSE (Vavryńćuk, 2014), SAC

Geographic Location Indo-Burma Range

Group Members Involved Patcharaporn "Nam" Maneerat <Email> <Personal Web Site>
Douglas Dreger, Roland Bürgmann

Project Duration 2018 - 2020

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