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

热带海洋学报 ›› 2020, Vol. 39 ›› Issue (1): 106-119.doi: 10.11978/2019020CSTR: 32234.14.2019020

滑行波震相对珠江口地区壳内低速层的约束作用

杨碧峰^1,², 熊成¹, 曹敬贺¹, 孙金龙¹(), 万奎元¹, 夏少红¹

1. 中国科学院边缘海与大洋地质重点实验室(南海海洋研究所), 广东广州 510301
2. 中国科学院大学, 北京 100049

收稿日期:2019-03-01 修回日期:2019-04-09 出版日期:2020-01-20 发布日期:2020-01-09
通讯作者: 孙金龙
作者简介:杨碧峰(1993—), 男, 湖南涟源市人, 硕士, 主要从事海洋地球物理研究。E-mail: yangbifeng16@mails.ucas.ac.cn
基金资助:
国家自然科学基金(41576046);国家自然科学基金(41506046)

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

YANG Bifeng^1,², XIONG Cheng¹, CAO Jinghe¹, SUN Jinlong¹(), WAN Kuiyuan¹, XIA Shaohong¹

1. CAS Key Laboratory of Ocean and Marginal Sea Geology, South China Sea Institute of Oceanology, Guangzhou 510301, China
2. University of Chinese Academy of Sciences, Beijing 100049, China

Received:2019-03-01 Revised:2019-04-09 Online:2020-01-20 Published:2020-01-09
Contact: Jinlong SUN
Supported by:
National Natural Science Foundation of China(41576046);National Natural Science Foundation of China(41506046)

摘要/Abstract

摘要：

深入研究珠江口地区海陆过渡带壳内低速层的结构和构造特征对于理解板内地震的发震机理、孕震构造及该区域的地壳结构具有重要的地质地球物理意义。利用2015年珠江口区域海陆地震联测L2-ME测线上的19个地震台站(包括陆上台站14台, 海底地震仪5台)记录到的地震数据来探明该区域低速层的结构和构造特征。在常规震相的基础上, 加入了大量的滑行波震相(Ph)进行结构模型计算, Ph震相的增加使得地壳内部10~20km范围内的射线覆盖密度有了显著提高, 从而获得了L2-ME测线下方更为精确的地壳纵波速度结构模型。结果发现, 模型中测线下方13~18km深度范围内稳定连续展布的壳内低速层被清晰成像, 其内部速度稳定在5.7~6.0 km·s^-1之间, 与上下层界面速度差分别为0.5km·s^-1、0.4km·s^-1, 低速特征明显。该低速层厚度由陆侧的3.5km左右降至海侧的1km, 呈现出向海侧逐渐减薄的趋势, 低速层底界面起伏变化较大且具有与莫霍面相似的起伏特征。

关键词: 珠江口, 滑行波, 壳内低速层, 地壳结构

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

中图分类号:

P738.4

杨碧峰, 熊成, 曹敬贺, 孙金龙, 万奎元, 夏少红. 滑行波震相对珠江口地区壳内低速层的约束作用[J]. 热带海洋学报, 2020, 39(1): 106-119.

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.

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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

滑行波震相对珠江口地区壳内低速层的约束作用

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

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