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Characteristics of secondary Pg phases from OBS wide-angle seismic survey and their role in crustal imaging
Wan Kui-Yuan; Cao Jing-He; Xia Shan-Hong; Sun Jin-Long; Huang Hai-Bo; Xu Hui-Long; Sun, JL (reprint author), Chinese Acad Sci, South China Sea Inst Oceanol, CAS Key Lab Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China.
2016
发表期刊CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
卷号59期号:8页码:2818-2832
摘要How to eliminate or utilize secondary waves is one of the significant topics in processing of seismic data of seismic exploration. Little work is concerned with this aspect of wide-angle seismic survey using the ocean bottom seismometer (OBS), especially taking advantage of the secondary waves to improve seismic imaging. This study attempts to deepen understanding of the characteristics of the secondary Pg phase and to discuss its application to seismic imaging in OBS wide-angle seismic survey. We firstly identify the secondary Pg phase from synthetic seismogram sections and record waveforms, then calculate and analyze particle motions of primary Pg and secondary Pg phases through the azimuth angle rotation. With this knowledge, we determine the propagation path by the theoretical model simulation and calculation of measured data from the P wave travel forward modeling method based on the RAYINVR. Furthermore, we use the theoretical model and the actual model of OBS2010 to show the role of the crustal structure imaging. The secondary Pg phase is roughly parallel to and follows closely the primary Pg phase, and is continuous and clear with strong amplitude. An obvious vibration is observed behind the vibration of the primary Pg with stronger amplitude, which is supposed to be generated by the secondary Pg phase. On the basis of particle motions, the secondary Pg phase belongs to the P wave seismic phase. The travel-time fits of the possible propagation path based on the test data give three different results: (1) The chi(2) value is 14.921 when the reflective layer is water and sediment. (2) The chi(2) value is 193.264 when the reflective layer is only water. And (3) the chi(2) value is 1.786 when the reflective layer is merely sediment. Theoretical investigation and data tests lead to following conclusions: (1) The secondary Pg phase is actually a P-wave. (2) The secondary Pg phase is mainly from the reflection between the sediments. (3) This wave greatly increases the constraint to the basement. And (4) it can be used to improve the imaging resolution of the sediments and the upper crust.
部门归属[Wan Kui-Yuan; Cao Jing-He; Xia Shan-Hong; Sun Jin-Long; Huang Hai-Bo; Xu Hui-Long] Chinese Acad Sci, South China Sea Inst Oceanol, CAS Key Lab Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China; [Wan Kui-Yuan] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
关键词Ocean Bottom Seismometer Secondary Pg Phase Wide-angle Seismic Survey Crustal Structure Imaging Resolution
学科领域Geochemistry & Geophysics
文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/15445
专题中科院边缘海地质重点实验室
通讯作者Sun, JL (reprint author), Chinese Acad Sci, South China Sea Inst Oceanol, CAS Key Lab Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China.
推荐引用方式
GB/T 7714
Wan Kui-Yuan,Cao Jing-He,Xia Shan-Hong,et al. Characteristics of secondary Pg phases from OBS wide-angle seismic survey and their role in crustal imaging[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2016,59(8):2818-2832.
APA Wan Kui-Yuan.,Cao Jing-He.,Xia Shan-Hong.,Sun Jin-Long.,Huang Hai-Bo.,...&Sun, JL .(2016).Characteristics of secondary Pg phases from OBS wide-angle seismic survey and their role in crustal imaging.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,59(8),2818-2832.
MLA Wan Kui-Yuan,et al."Characteristics of secondary Pg phases from OBS wide-angle seismic survey and their role in crustal imaging".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 59.8(2016):2818-2832.
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