[1]张馨予,曹敬贺,赵 芳,等.珠江口海域NW向断裂的地震学特征及意义[J].华南地震,2019,39(04):1-9.[doi:10.13512/j.hndz.2019.04.001]
　ZHANG Xinyu,CAO Jinghe,ZHAO Fang,et al.Seismological Features and Geological Implication of the NW Faults in the Pearl River Estuary[J].,2019,39(04):1-9.[doi:10.13512/j.hndz.2019.04.001]
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珠江口海域NW向断裂的地震学特征及意义()
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华南地震[ISSN:1006-6977/CN:61-1281/TN]

卷:
39
期数:
2019年04期
页码:
1-9
栏目:
华南地震
出版日期:
2019-12-31

文章信息/Info

Title:
Seismological Features and Geological Implication of the NW Faults in the Pearl River Estuary
文章编号:
1001-8662（2019）0４-0001-09
作者:
张馨予1; 2; 曹敬贺1; 赵 芳1; 王力伟3; 4; 熊 成1; 夏少红1
（1. 中国科学院边缘海与大洋地质重点实验室 中国科学院南海海洋研究所，广州 510301；
2. 中国科学院大学，北京 100049；
3. 中国地震局地震观测与地球物理成像重点实验室 中国地震局地球物理研究所，北京 100081；
4. 广东省地震局，广州 510070）
Author(s):
ZHANG Xinyu1; 2; CAO Jinghe1; ZHAO Fang1; WANG Liwei3; XIONG Cheng1; XIA Shaohong1
（1. Key Laboratory of Marginal Sea Geology，South China Sea Institute of Oceanology，Chinese Academy of Sciences，Guangzhou 510301，China；2. University of Chinese Academy of Sciences，Beijing 100049，China；3. Key Laboratory of Seismic Observation and Geophysical Imaging，Institute of Geophysics，China Earthquake Administration，Beijing 100081，China；4. Guangzhou Earthquake Agency，Guangzhou 510070，China）
关键词:
珠江口海域; 反射地震; 西江断裂; 淇澳—桂山岛东断裂
Keywords:
Pearl River Estuary; Reflection seismic; Xijiang fault; Qi’ao-Guishan fault
分类号:
P315.2
DOI:
10.13512/j.hndz.2019.04.001
文献标志码:
A
摘要:
珠江口地区是我国重要的经济发达区域，断裂控制了珠江三角洲的坳陷和水系发育，同时也控制了珠江口盆地南北分带、东西分块的构造格局。目前，关于珠江口海域NW向断裂的探测还不够深入，系统认识和理解该地区NW向断裂是否自陆地延伸到海区，及其延伸至海区后的展布位置和发育特征，不仅可以揭示珠江口海域NW向断裂陆—海一体化构造特征，而且可以为珠江三角洲的工程建设、资源开发提供重要的地质信息，同时可以辅助该区地震等灾害监测机制的完善。以2015年获取的反射地震数据为基础，在地震剖面中确定了西江断裂、淇澳—桂山岛东断裂由陆向海延伸情况。西江断裂在区域内表现为一组走向NW、倾向各异的高角度正断层，基底断距达1 km左右。淇澳—桂山岛东断裂为走向NW、倾向西南、倾角约45°的正断层，研究区内断裂的断距约300 m，与担杆岛以南的一段相比断距有明显增大的趋势。反射地震剖面也揭示了NW向断裂在该区域将滨海断裂带错断为三段，对地形的控制自陆向海逐渐减弱。虽然珠江口地区的主要控震构造为NEE向断裂，但NW向和NEE向断裂交汇构造区是主要的应力积累区，为地震多发区，说明NW向断裂在地震活动性方面也发挥了很重要的作用。
Abstract:
The Pearl River Estuary (PRE) is an important economically developed area in China. The fault controls the depression and water system development of the Pearl River Delta，which also dominates the framework that belts in south-north and blocks in east-west in the Pearl River Estuary Basin (PREB). At present，the research on NW-trending faults in PRE is very scarce. A systematic understanding of whether the major faults in this area extend from onshore to offshore，and their geometric characteristics after extending to offshore area，which can not only reveal the NW-trending land-sea integrated structural features of the PRE，but also provide important geological information for project construction and resource development in Pearl River Delta. Based on reflection seismic data acquired in 2015，this paper determines the extension of Xijiang fault (XJF) and Qi’ao-Guishan fault (QGF) from land to sea in seismic profile. The XJF appears as a group of high-angle normal faults with NW strike and different inclinations in the region，and the basement fault distance is about 1 km. The QGF is a normal fault that strikes northwest，tends to the southwest with a dip angle of about 45°. The fault distance is about 300 m，which exhibits a significant increase compared to the south section of the Dangan islands. The reflection seismic profiles also reveal that the NW-trending fault divides the Littoral Fault Zone (LFZ) into three sections in this region，and topographic control gradually weakened from land to sea. Although the main seismogenic structure in PRE is NEE-trending faults，and the intersection of NW-trending and NEE-trending faults is the main stress accumulation area，indicating that NW-trending faults also play an important role in seismicity.

备注/Memo

备注/Memo:
收稿日期：2019-05-10
基金项目：国家自然科学基金（U1701641，41506046，41576046）；广东省自然科学基金项目（2017A030311015）；中科院边缘海与大洋地质重点实验室开放基金项目（MSGL15-05）
作者简介：张馨予（1993- ），女，硕士研究生，主要从事地震数据处理与解释工作。
E-mail：zhangxinyu16@mails.ucas.edu.cn.
更新日期/Last Update: 2020-02-26