滑行波震相对珠江口地区壳内低速层的约束作用

doi:10.11978/2019020

Abstract

Abstract:

Exploring the structure and tectonic characteristics of the low-velocity layer (LVL) in a transition zone of the Pearl River Estuary (PRE) area has significant geological and geophysical implications for understanding the mechanism of intraplate earthquakes, seismogenic structure and crustal structure in this area. In this study, we use the data from 19 seismic stations (include 14 onshore seismic stations and five ocean bottom seismometers) along the L2-ME profile of the 2015 onshore-offshore deep seismic experiment in the PRE area to image structure features of the LVL. On the basis of the conventional seismic phase, a large number of sliding wave seismic phases are added to calculate the structural model. With the increase of Ph seismic phases, the ray coverage density within the range of 10-20 km was significantly increased, and a more accurate P-wave velocity structure model of the LVL and its above crustal structure along the L2-ME profile were obtained. The result shows the LVL is clearly imaged in the crust within the depth range of 13-18 km under the profile. The velocity in the LVL is roughly stable in the range of 5.7-6.0 km·s^-1 and has an obvious low-velocity anomaly feature of 0.5 km·s^-1 difference compared with its top layer and of 0.4 km·s^-1 difference compared with its bottom layer. Its thickness decreases from 3.5 km on the land side to 1 km on the sea side, showing a trend of gradual thinning toward the sea side. The bottom boundary of the LVL has similar fluctuation characteristics to the Moho.

Key words: the Pearl River Estuary, sliding wave, low-velocity layer, crustal structure

CLC Number:

P738.4

YANG Bifeng, XIONG Cheng, CAO Jinghe, SUN Jinlong, WAN Kuiyuan, XIA Shaohong. Constrains of sliding wave phases on the low-velocity layer in the Pearl River Estuary[J].Journal of Tropical Oceanography, 2020, 39(1): 106-119.

Figures/Tables 15

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震相	拾取数量	拾取误差/ms
Ps	63	50
Pg1	2960	80
Pg2	191	80
PmP	2982	100
合计	6196

地震台站	分量	拾取误差/ms	Ph震相数	走时残差/s	χ²
0716	垂直	80	216	0.094	1.378
0729	垂直	50	293	0.047	0.886
0739	垂直	50	159	0.059	1.406
0741	垂直	80	250	0.107	1.782
0742	垂直	50	351	0.051	1.040
0755	垂直	80	137	0.098	1.523
0779	垂直	80	133	0.083	1.088
0789	垂直	80	251	0.076	1.113
合计			1790

Constrains of sliding wave phases on the low-velocity layer in the Pearl River Estuary

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