NDLI: Crustal velocity structure of the Shaowu-Nanping-Pingtan transect through Fujian from deep seismic sounding-tectonic implications

Content Provider	Springer Nature Link
Author	Li, Pei Jin, Xin Wang, ShanXiong Cai, HuiTeng
Copyright Year	2015
Abstract	The Shaowu-Nanping-Pingtan deep seismic sounding profile is located in northern Fujian Province. High-quality seismic sounding data were acquired by five large explosive blasts received by 133 digital seismic instruments along the profile. Based on seismic facies analysis and travel-time picking on shot record sections, a model of the velocity structure of upper crust was developed by finite-difference tomography of the first breaks; the 2-D P-wave velocity structure and tectonic characteristics of the crust were interpreted further by fitting of waveforms and seismic travel times. The results show that the top of the crystalline basement is buried at depths of 2.0–4.0 km, with the deepest buried up to 4.0 km within the Fuzhou Basin. The Moho interface was found to be deeper in the west and shallower in the east (i.e., 30.0 km near the coast, increasing to 33.0 km northwestward). The lower crust on the east side of the Zhenghe-Haifeng Fault Zone has a smoothly varying gradient structure, whereas on the west side it has two distinct layers with a boundary between those layers at a depth of 23 km. Seismic velocities on the west side are generally lower than on the east side; a low velocity layer is observed with a lowest speed of 6.25 km/s at a depth of 22 km on the west side, which may consist of partially molten material. The Zhenghe-Haifeng Fault is a deep crustal fault, and should be a channel for deep material upwelling; it has a direct relationship with multiple stages of continental tectonic movements in Southern China and with multiple magmatic events that started in the Proterozoic and ended in the of late Tertiary in Fujian.
Starting Page	2188
Ending Page	2199
Page Count	12
File Format	PDF
ISSN	16747313
Journal	Science in China Series D: Earth Sciences
Volume Number	58
Issue Number	12
e-ISSN	18691897
Language	English
Publisher	Science China Press
Publisher Date	2015-11-05
Publisher Place	Beijing
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	deep seismic sounding profile of Shaowu-Nanping-Pingtan finite-difference tomography velocity structure Zhenghe-Haifeng fault belt Earth Sciences
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences

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