Title

Crustal Anisotropy beneath South-Central Tibet revealed by P-to-S conversions from the Moho

Presenter Information

Shuoyu Yao

Department

Geosciences and Geological and Petroleum Engineering

Major

Geology and Geophysics

Research Advisor

Gao, Stephen S.

Advisor's Department

Geosciences and Geological and Petroleum Engineering

Funding Source

Missouri University of Science and Technology

Abstract

We investigate crustal anisotropy along the Hi-CLIMB seismic array, an approximately N-S oriented broadband seismic profile of about 800-km long along the longitudinal line of 85 E, by using P-to-S converted phases from the Moho. Using the approach of fitting moveout times of the Pms arrivals on the receiver-functions under the assumption of a flat and sharp Moho, the fast polarization orientation and splitting time at 148 stations have been measured. Our results suggest eastward crustal extrusion occurring in central Tibet and southward crustal flow in southern Tibet. Based on the significant changes of the splitting parameters, we propose the following key elements regarding the Himalayan-Tibetan collision configuration: (1) the onset of mid-crustal low velocity zone at north of the Main Boundary Thrust; (2) the potential termination of the Indian upper crust at the Main Central Thrust; (3) the northern limit of the Indian crust at approximate 31 N in central Lhasa Terrain.

Biography

Shuoyu Yao grew up in Shandong province, China. Before transferring to Missouri University of Science and Technology in 2013 fall semester, he had studied at China University of Petroleum (East China) for his freshman and sophomore years. He is currently a graduating senior student majoring in Geology and Geophysics. Shuoyu Yao has conducted his undergraduate research under the supervision of Dr. Stephen Gao for several semesters since 2014 spring. His research focuses on the geodynamics in Tibetan Plateau by using seismological approaches. After graduation, he will continue his graduate education at New Mexico Institute of Mining and Technology. Shuoyu Yao’s career goal is to become a geophysical expert serving in petroleum industry.

Research Category

Sciences

Presentation Type

Poster Presentation

Document Type

Poster

Location

Upper Atrium/Hall

Presentation Date

15 Apr 2015, 9:00 am - 11:45 am

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Apr 15th, 9:00 AM Apr 15th, 11:45 AM

Crustal Anisotropy beneath South-Central Tibet revealed by P-to-S conversions from the Moho

Upper Atrium/Hall

We investigate crustal anisotropy along the Hi-CLIMB seismic array, an approximately N-S oriented broadband seismic profile of about 800-km long along the longitudinal line of 85 E, by using P-to-S converted phases from the Moho. Using the approach of fitting moveout times of the Pms arrivals on the receiver-functions under the assumption of a flat and sharp Moho, the fast polarization orientation and splitting time at 148 stations have been measured. Our results suggest eastward crustal extrusion occurring in central Tibet and southward crustal flow in southern Tibet. Based on the significant changes of the splitting parameters, we propose the following key elements regarding the Himalayan-Tibetan collision configuration: (1) the onset of mid-crustal low velocity zone at north of the Main Boundary Thrust; (2) the potential termination of the Indian upper crust at the Main Central Thrust; (3) the northern limit of the Indian crust at approximate 31 N in central Lhasa Terrain.