全部 标题 作者
关键词 摘要

OALib Journal期刊
ISSN: 2333-9721
费用:99美元

查看量下载量

相关文章

更多...

珠江口海域滨海断裂带的地震学特征

DOI: 10.6038/cjg20140215, PP. 498-508

Keywords: 珠江口,滨海断裂带,海陆地震联测,地壳结构

Full-Text   Cite this paper   Add to My Lib

Abstract:

利用2010年珠江口外海陆地震联测数据,探测到滨海断裂带在担杆岛外12km处发育,断裂带主体倾向东南、宽约20km,沉积层在断裂带内迅速增厚引起陆上固定地震台站的Pg震相在对应断裂带位置的走时明显滞后.通过震相分析和走时正演拟合,获得了滨海断裂带两侧由浅至深的纵波速度结构模型,断裂带内部沉积层速度为1.8~3.5km/s,上地壳速度5.2~6.1km/s,下地壳速度为6.3~6.6km/s,莫霍面的埋深由滨海断裂带陆侧的29km抬升至其海侧的27km.滨海断裂带两侧的地壳结构特征明显不同,证实了该断裂带是华南陆区正常型陆壳与南海减薄型陆壳分界断裂的性质.在华南沿海和海陆过渡带的下地壳顶部探测到厚约3km、层速度为5.5~5.9km/s的低速层,往海域逐渐减薄尖灭.壳内低速层是地壳中的力学软弱带,与近似正交的NEE向滨海断裂带和NW向断裂带共同组构成了该区地震活动的孕震构造.

References

[1]  Lee C F, Ding Y Z, Huang R H, et al. 1998. Seismic hazard analysis of the Hong Kong region. Geo Report No.65. Hong Kong: Geotechnical Engineering Office, 14-24.
[2]  Li X Y, Wu Z L, Xue B, et al. 2007. Short-period auto-floating ocean bottom seismometer and its operational experiences. Journal of Tropical Oceanography (in Chinese), 26(5): 35-39.
[3]  Liao Q L, Wang Z M, Wang P L, et al. 1988. Explosion seismic study of the crustal structure in Fuzhou-Quanzhou-Shantou region. Chinese J. Geophys. (Acta Geophysica Sinica) (in Chinese), 31(3): 270-370.
[4]  Lin J Z, Liang G Z, Zhao Y, et al. 1980. Focal mechanism and tectonic stress field of coastal southeast China. Acta Seismologica Sinica (in Chinese), 2(3): 245-257.
[5]  Liu Y X. 1985. The active fractures in South China coast. Marine Geology & Quaternary Geology (in Chinese), 5(3): 11-21.
[6]  Liu Y X. 1986. Basic features and activity discussion of Nan''ao Fault Zone and Littoral Fault Zone. South China Journal of Seismology (in Chinese), 6(3): 1-8.
[7]  Liu Y X, Zhong J Q, Zhan W H. 1994. The Basic characteristics of seismic belts and preliminary analyses of regional stability in north continental margin of South China Sea. South China Journal of Seismology (in Chinese), 14(4): 41-46.
[8]  Xu H L, Qiu X L, Zhao M H, et al. 2006. Characteristics of the crustal structure and hypocentral tectonics in the epicentral area of Nan''ao earthquake (M7.5), the northeastern South China Sea. Chinese Science Bulletin (in Chinese), 51(S2): 95-106.
[9]  Xu J, Zhang J, Zhou B G, et al. 2006. A study on the Binhai Fault Zone in the northern South China Sea. South China Journal of Seismology (in Chinese), 26(4): 8-13.
[10]  Yang X S, Ma J, Zhang X J. 2003. Summarization of genesis of low-velocity layer in continental crust. Geological Science and Technology Information (in Chinese), 22(2): 35-41.
[11]  Yao B C. 1993. Probing into Cenozoic tectonic movements of the continental margin in northern South China Sea. Geological Research of South China Sea (in Chinese), (5): 1-12.
[12]  Yao B C. 1998. Crust structure of the northern margin of the South China Sea and its tectonic significance. Marine Geology & Quaternary Geology (in Chinese), 18(2): 1-13.
[13]  Yin Z X, Lai M H, Xiong S B, et al. 1999. Crustal structure and velocity distribution from deep seismic sounding along the profile of Lianxian-Boluo-Gangkou in South China. Chinese J. Geophys. (in Chinese), 42(3): 383-392.
[14]  You Q Y, Liu F T, Ran C R, et al. 2003. High frequency micro-power ocean bottom seismograph. Progress in Geophysics (in Chinese), 18(1): 173-176.
[15]  Zeng W J. 1992. Geoscience transect of Guangzhou to Palawan// Liu G D, ed. Geologic and geophysical features of China seas and adjacent regions. Beijing: Science Press, 272-288.
[16]  Zelt C A, Smith R B. 1992. Seismic traveltime inversion for 2-D crustal velocity structure. Geophys. J. Int., 108(1): 16-34.
[17]  Zhang H N, Wu Q H. 1994. A comparative study of main active fault zone along the coast of South China. Seismology and Geology (in Chinese), 16(1): 43-52.
[18]  Zhao M H, Qiu X L, Ye C M, et al. 2004. Analysis on deep crustal structure along the onshore-offshore seismic profile across the Binhai (Littoral) Fault Zone in northeastern South China Sea. Chinese J. Geophys. (in Chinese), 47(5): 845-852.
[19]  Zhao Z X, Zhou D, Liao J, et al. 2010. Lithospheric stretching Modeling of the continental shelf in the Pearl River Mouth Basin and analysis of post-breakup subsidence. Acta Geologica Sinica (in Chinese), 84(8): 1135-1145.
[20]  Zhong J Q. 1987. The location and activity of Binhai Fracture Zone. South China Journal of Seismology (in Chinese), 7(4): 1-7.
[21]  Cao J H, Xia S H, Sun J L, et al. 2012. Preliminary results of onshore-offshore seismic experiments in a potential strong earthquake area off the Pearl River Estuary. Journal of Tropical Oceanography (in Chinese), 31(3): 71-78.
[22]  Chau K T, Wong R H C, Wong Y L, et al. 2004. Three-dimensional surface cracking and faulting in Dangan Islands area, south of Hong Kong. 3rd International Conference on Continental Earthquakes, Beijing, China, 1-14.
[23]  Chen E M, Huang Y Y. 1984. Nineteen strong earthquakes in South China-The summary of continental margin seismic belt along the northern South China Sea. South China Journal of Seismology (in Chinese), 4(1): 11-32.
[24]  Cheng S X, Li S Z, Suo Y H, et al. 2012. Cenozoic tectonics and dynamics of basin groups of the northern South China Sea. Marine Geology & Quaternary Geology (in Chinese), 32(6):79-93.
[25]  Ding Y Z, Huang X H. 1995. Mathematical simulation after the seismic risk on the Coastal Fault Zone in the South China Sea. South China Journal of Seismology (in Chinese), 15(1): 12-20.
[26]  Feng Z Q, Liu Z H, Wang Q. 1998. Distribution of faults and analysis for geo-hazard in the Southeast Sea Area out of Hong Kong. The Chinese Journal of Geological Hazard and Control (in Chinese), 9(S1): 114-119.
[27]  Hao T Y, You Q Y. 2011. Progress of homemade OBS and its application on ocean bottom structure survey. Chinese J . Geophys. (in Chinese), 54(12): 3352-3361.
[28]  Jia S X, Li Z X, Xu Z F, et al. 2006. Crustal structure features of the Leiqiong Depression in Hainan Province. Chinese J. Geophys. (in Chinese), 49(5):1385-1394.
[29]  Kenner S J, Segall P. 2000. A mechanical model for intraplate earthquakes: Application to the New Madrid seismic zone. Science, 289(5488): 2329-2332.
[30]  Lu B H, Huang R H. 2006. Faults and Earthquakes in the Southeast Coastal Region of China. South China Journal of Seismology (in Chinese), 26(3): 109-118.
[31]  Lu C B, Zhan W H, Liu Y X. 1991. Analyses on fault activity and regional stability in the Pearl River Mouth. Tropic Oceanology (in Chinese), 10(1): 5-12.
[32]  Luan X W, Liu H, Peng X C. 2011. The geophysical interpretation of Dongsha ancient uplift on the northern margin of South China Sea. Chinese J. Geophys. (in Chinese), 54(12): 3217-3232.
[33]  South China Sea Institute of Oceanology, Chinese Academy of Sciences, Fujian Oceanic Institute. 1989. The investigation and study on petroleum geology and geophysics in the western Taiwan Strait (in Chinese), Beijing: Ocean Press, 106-109.
[34]  Tan M T, Qiu Y X, Zou H P, et al. 2000. Regional tectonic study in the coastal of Guangdong (in Chinese). Guangzhou: Guangdong Geology and Mineral Exploration Bureau, 45-71.
[35]  Wei B L. 2001. The Characteristic of Seismic Activities in China''s Southeast Coast (in Chinese). Beijing: Seismological Press, 58-60.
[36]  Wong W T, Chan Y W, Kang Y, et al. 2007. Source parameters of ML4.0 earthquake near Dangan islands on 14.9.2006. Asian-Pacific Network of Centers for Earthquake Engineering Research 2007 Meeting, Reprint 715,1-8.
[37]  Wu J M. 1998. Some problems on the geological tectonic evolution in the South China Sea// Chen Y et al., eds. Cundan Collected Papers-in honour of the 50 year''s work of academician Liu Guangding (in Chinese). Beijing: Science Press, 61-73.
[38]  Xia S H, Qiu X L, Zhao M H, et al. 2007. Data processing of onshore-off shore seismic experiment in Hong Kong and Zhujiang River Delta region. Journal of Tropical Oceanography (in Chinese), 26(1): 35-38.
[39]  Xia S H, Qiu X L, Zhao M H, et al. 2008. Investigation on deep crustal structure along the onshore-offshore seismic profile near Hong Kong. Progress in Geophysics (in Chinese), 23(5): 1389-1397.
[40]  Xia S H, Qiu X L, Zhao M H, et al. 2010. Analysis of crustal average velocity and Moho depth beneath the onshore-offshore transitional zone in the northern South China Sea. Journal of Tropical Oceanography (in Chinese), 29(4): 63-70.
[41]  Xia S H, Ao W, Zhao M H, et al. 2011. Corrections and analysis of wide angle seismic data from the sea. Marine Science Bulletin (in Chinese), 30(5): 487-491.
[42]  Xia S H, Zhao M H, Qiu X L, et al. 2010. Crustal structure in an onshore-offshore transitional zone near Hong Kong, northern South China Sea. Journal of Asian Earth Sciences, 37(5-6): 460–472.
[43]  Xia S H, Qiu X L. 2012. Three-dimensional tomographic model of the crust beneath the Hong Kong region. Geology, 40(1): 59.
[44]  Xu H L, Ye C M, Qiu X L, et al. 2010. Studies on the Binhai Fault Zone in the northern South China Sea by the deep geophysical exploration and its seismogenic structure. South China Journal of Seismology (in Chinese), 30(S1): 10-18.

Full-Text

Contact Us

service@oalib.com

QQ:3279437679

WhatsApp +8615387084133