Abstract
12095 P-wave phase data were selected in this study from four NW-oriented and four NE-oriented explosion sounding survey lines conducted along the coast and midland of Southeast China during the years 2010 and 2012. The 1-D crust P-wave velocity model was obtained in the continental margin of Southeast China (Fujian Province) using the travel time residual as the threshold and performing linear iterative inversion. This crust model includes 5 layers with the velocities being 5.04, 5.44, 6.06, 6.16, 6.39 km s^(-1), respectively, with the bottom depths being 0.23, 2.82, 6.44, 18.81, 30.42 km, respectively, and the uppermost mantle velocity being 8.08 km s^(-1). Compared with previous work the four P-wave phase data could effectively reflect the shallow and deep crust characteristics. The joint inversion method involves both the velocity and depth. The results in this paper could therefore be more reasonable and applicable than previous findings, with fairly good control in both the shallow and deep crusts. These findings have practical significance for compiling the earthquake travel time table and precisely locating earthquakes in this area. This work also provides an accurate preliminary model for subsequent 2-D and 3-D velocity structure inversions in the Southeast China (Fujian Province) continental margin.
Highlights
Seismic wave use as carriers to detect the Earth’s internal structure has been the most effective method with the highest resolution far (Zhou and Xu 2010)
Equation (1) shows that travel time is a nonlinear function of the velocity and the interface depth
The Pg phase was compared using only the results selected from this study and the studies of Chen et al (2005) and Li et al (2011)
Summary
Seismic wave use as carriers to detect the Earth’s internal structure has been the most effective method with the highest resolution far (Zhou and Xu 2010). With the development of global digital seismic observation technology and the construction of numerous observation networks along with continual advances in computer technology, earthquakes can be located rapidly and their 3-D velocity structure inversion obtained. The typical early 1-D velocity structure research methods mainly include Herglotz-Wiechert, Gutenberg Inversion and τ(p) (Geiger 1912). The 1-D velocity structures of most of these methods were attained using numerous earthquake travel time data. Due to uncertainty compared with the earthquake, the 1-D velocity structure inversion precision for the explosion would be higher than that for the earthquake if the artificial seismic ray can be evenly distributed within the region
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