| Regionalized difference of the 660 km discontinuity beneath Izu-Bonin |
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| 作者姓名： | 周元泽 蒋志勇 臧绍先 |
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| 作者单位： | ZHOU Yuan-ze JIANG Zhi-yong ZANG Shao-xianDepartment of Geophysics，Peking University，Beijing 100871，China |
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| 基金项目： | State Natural Science Foundation of China (49874020) and the Special Funds for Major State Basic Research of China (95-13-04-06). |
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| 摘 要： | Introduction The detail structure of the Earths interior is a major field of geophysics and the existences and properties of mantle discontinuities are its important content. Based on the seismic tomographic results (Fukao, et al, 1992, Van der Hilst, et al, 1991) and the distribution of earthquake hypocenters in the Circum-Pacific region and other regions, the effects of subducting slab at different regions on the 660 km discontinuity are different: some subducting slabs penetrate through; …
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| 收稿时间： | 10 January 2001 |
| 修稿时间： | 20 April 2002 |
Regionalized difference of the 660 km discontinuity beneath Izu-Bonin |
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| Zhou Yuan-ze, Jiang Zhi-yong and Zang Shao-xian.Regionalized difference of the 660 km discontinuity beneath Izu-Bonin[J].Acta Seismologica Sinica(English Edition),2002,15(3):333-340. |
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| Authors: | Zhou Yuan-ze Jiang Zhi-yong and Zang Shao-xian |
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| Institution: | Department of Geophysics, Peking University, Beijing 100871, China |
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| Abstract: | Digital waveform data recorded by the vertical component short period stations at the American networks of SCSN, NCSN and PNSN and three components broadband stations at the Germany and Swiss networks and arrays of GRFN, GRSN and SDSNet for the events between 1981 and 2000 under Izu-Bonin are used as data sets. The N-th root slant stack method was used to pick up the SdP phase converted at the velocity interface beneath source and the regionalized difference of the 660 km discontinuity beneath Izu-Bonin is studied. It is found that while the dip angles of the subducting slab and the maximal depths of sources increase gradually from 35N to 26N, the 660 km discontinuity appears regionalized differences. The discontinuity exists at 660 km while there is no effect from subducting slab, but it is depressed to the depth of 720 km while there are obvious effects. The dispersion of converted points is still an unsolved problem which maybe result from the complex structure of the discontinuity, converted phases which were misjudged, or the assumption of one dimensional spherical earth model. |
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| Keywords: | km discontinuity N-th root slant stack subducting slab Izu-Bonin |
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