5F (2022-2024): Burma Arc from Collision Kinematics to Subduction Tectonics as Observed from Passive seismic - Thailand

• University of Missouri

BACKSTOP (Burma Arc from Collision Kinematics to Subduction Tectonics as Observed from a Passive seismic experiment) was originally planned to be a joint Myanmar-Singapore-American international project (EAR-1547455) that will deploy a 26- station network across the northern and central part of Myanmar. Due to a February 2021 coup in Myanmar the deployment of seismic stations across any part of Myanmar is likely impossible. We are therefore proposing a change in scope with regard to the deployment of seismic stations. We propose instead to deploy seismic stations in Thailand and Laos. This is possible because of a collaboration we have established with Kasetsart University in Bangkok Thailand. We have already begun to share data with our Thai colleagues for use in other research projects in Myanmar and it will be important for our research on this project as well. Even with the change in scope of our seismic deployment we expect to be able to address many of the same scientific questions. Overall, our primary scientific goal is to determine the role that extreme oblique subduction of India plate plays in back-arc tectonics, the clockwise rotational deformation of the SE Tibetan Plateau, and the origin of recent volcanism in Yunnan, China. In addition, we plan to attempt to determine the origin of the high elevation of Southeast Asian Highlands (SAH) south of the Eastern Himalayan Syntaxis (EHS) that extends from the southeastern edge of the Tibetan plateau through Yunan province and eastern Myanmar to northern Thailand and Laos. This includes part of the Shan Plateau. This portion of the Sundaland plate is relatively poorly understood, due in part to the lack of geophysical studies across southeast Asia. .

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