EGU21-2001
https://doi.org/10.5194/egusphere-egu21-2001
EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Crustal seismic structure of Red-River shear zone and surrounding area

Ha Vinh Long1,2,4, Hsin-Hua Huang1, Le Minh Nguyen3, Van Duong Nguyen3, Quang Khoi Le3, Thi Giang Ha3, Dinh Quoc Van3, Bor-Shouh Huang1, and Tu Son Le3
Ha Vinh Long et al.
  • 1Institute of Earth Sciences, Academia Sinica, TIGP-ESS, Taipei, Taiwan, Province of China (havinhlong1988@g.ncu.edu.tw)
  • 2National Central University, Taoyuan City, Taiwan
  • 3Institute of Geophysics, Vietnam Academy of Science and Technology, Ha Noi, Vietnam
  • 4Taiwan International Graduate Program Earth Sciences System (TIGP-ESS), Academia Sinica, Taiwan

The collision between the Eurasian and Indian plates since about 65 Ma caused extensive deformation in the Tibetan Plateau and surrounding areas. Northern Vietnam located in the southeastern Himalayan syntaxis is directly influenced by the collision and extrusion through the Red River shear zone that runs from southeastern Tibet to the South China Sea. Knowledge of crustal structure characteristics in northern Vietnam and across the Red River shear zone is crucial to improve our understanding not only of seismic hazards in the region but also of the regional Himalayan tectonic evolution as a whole. Seismic tomography is one of few methods that allows to study the subsurface structures effectively. In this study, we perform a joint tomographic inversion for northern Vietnam integrating the P- and S-direct waves traveling in the crust and the head waves along the Moho waves arrival time from more than 1000 earthquakes observed by Vietnamese networks. The obtained velocity model shows a good correlation with shallow geological features but also some complexity at crustal-scale. Several velocity anomalies bounded by and across the fault zones are revealed and discussed

 

Keyword: Traveltime tomography, Northern Vietnam, VpVs ratio, crustal structure, Vietnam seismic network

How to cite: Long, H. V., Huang, H.-H., Nguyen, L. M., Nguyen, V. D., Le, Q. K., Ha, T. G., Van, D. Q., Huang, B.-S., and Le, T. S.: Crustal seismic structure of Red-River shear zone and surrounding area, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-2001, https://doi.org/10.5194/egusphere-egu21-2001, 2021.

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