T43A-2977
The crustal structures from Wuyi-Yunkai orogen to Taiwan orogen: the onshore-offshore wide-angle seismic experiment of TAIGER and ATSEE projects

Thursday, 17 December 2015
Poster Hall (Moscone South)
Hao Kuochen1, Nick Yao-Wen Kuo1, Chien-Ying Wang1, Xin Jin2, Hui-Teng Cai2, Jing Yi Lin1, Francis T Wu3, Horng-Yuan Yen1, Bor-Shouh Huang4, Wen-Tzong Liang4, David A Okaya5, Larry D Brown6 and Across Taiwan Strait Explosion Experiment (ATSEE) and Taiwan Integrated Geodynamics Research project (TAIGER), (1)Department of Earth Sciences, National Central University, Jhongli, Taiwan, (2)Earthquake Administration of Fujian Province, Fuzhou, China, (3)SUNY at Binghamton, Binghamton, NY, United States, (4)Institute of Earth Sciences, Academia Sinica, Taipei, Taiwan, (5)University of Southern California, Los Angeles, CA, United States, (6)Cornell University, Ithaca, NY, United States
Abstract:
The crustal structure is key information for understanding the tectonic framework and geological evolution in the southeastern China and its adjacent area. In this study, we integrated the data sets from the TAIGER and ATSEE projects to resolve onshore-offshore deep crustal seismic profiles from the Wuyi-Yunkai orogen to the Taiwan orogen in southeastern China. Totally, there are three seismic profiles resolved and the longest profile is 850 km. Unlike 2D and 3D first arrival travel-time tomography from previous studies, we used both refracted and reflected phases (Pg, Pn, PcP, and PmP) to model the crustal structures and the crustal reflectors. 40 shots, 2 earthquakes, and about 1,950 stations were used and 15,319 arrivals were picked among three transects. As a result, the complex crustal evolution since Paleozoic era are shown, which involved the closed Paleozoic rifted basin in central Fujian, the Cenozoic extension due to South China sea opening beneath the coastline of southern Fujian, and the on-going collision of the Taiwan orogen.
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