东亚及西太平洋地壳上地幔P波三维速度结构

doi:10.7523/j.issn.2095-6134.2005.3.011

摘要/Abstract

摘要：

利用ISC报告中170550条P波到时资料(地震数为12500,台站数为928个,且地震和台站都分布在研究区内),对东亚及西太平洋边缘海(60°E～150°E,10°S～60°N)的深至300km的地壳上地幔三维速度结构进行了研究,分辨率达2°×2°.初步结果表明:(1)在研究区域内东西两部分的岩石圈与上地幔低速带的结构有非常明显的差异.横向上大体以108°E为界,纵向上以90km深度为界,东部与西部P波速度结构差异较大.西部是岩石圈汇聚增厚区,东部是岩石圈拉张减薄区.西部上地幔低速带不发育,东部低速带比西部厚.(2)青藏高原地壳岩石圈巨厚,上地幔低速带不明显.印度次大陆岩石圈板片以低角度下插到青藏高原之下.(3)日本海和菲律宾海地壳之下有高速体,可能是太平洋板块向东俯冲产生的.

关键词: 东亚及西太平洋边缘海, 地壳上地幔, P波三维速度结构

Abstract:

3-D velocity structure of crust and upper mantle beneath the East Asia and West Pacific marginal seas (60bE~ 150bE, 10bS~ 60bN) down to the depth of 300km has been studied by using a total of 170550 P-wave first arrival times from the ISC bulletin, which are selected from 12500 events and 928 seismic stations within the studying areas. The result is given with the resolution of grid spacing of 2b@ 2b. The preliminary results show: (1) The P-wave velocity structure is so different between the eastern part and western part of the East Asia and West Pacific marginal seas by the boundary of 108bE. The western part isthe thickening convergent lithosphere caused by Indian subcontinent colliding with the Eurasian continent, and the eastern part is a disassembly causing the lithosphere thinning and extension arising from intrusion of asthenospheric material. (2) The crust and lithosphere of the Tibet is very thick, and the LVZ is not obvious. The Indian subcontinent dived to the beneath of the Tibet. (3) There are the high-velocity anomalies beneath the Japan Sea and the Philippines Sea. It could be the evidence that the Pacific slab dived to this area.

Key words: the East Asia and West Pacific marginal seas, the crust and the upper mantle, P-wave 3-D velocity structure

中图分类号:

P315

瞿辰, 周蕙兰. 东亚及西太平洋地壳上地幔P波三维速度结构[J]. 中国科学院大学学报, 2005, 22(3): 329-340.

QU Chen, ZHOU Hui-Lan. P-Wave Velocity Structure of Crust and Upper Mantle in East Asia and West Pacific Marginal Seas[J]. , 2005, 22(3): 329-340.

参考文献

[1] Zhu JS, Cao JM, Cai XL, et al. High resolution surface wave tomography in east Asia and west Pacific marginal seas. Chinese Journal of Geophysics, 2002, 45(5) : 646~ 664(in Chinese with English abstract)

[2] Zhu JS, Cao JM, Cai XL, et al. Study for three-dimensional structure of earth interior and geodynamics in china and adjacent land and sea regions. Advance in Earth Sciences,2003, 18(4) : 497~ 503(in Chinese with English abstract)

[3] Liang CT. The body wave tomography of east asia and adjacent area: [Master Thesis]. Chengdu: Chengdu University of Technology, 2000(in Chinese with English abstract)

[4] Jin AS, Liu FT, Sun YZ.The P wave velocity structure of crust and the uppermantle in Beijing. ChineseJournal of Geophysics, 1980, 23: 172~ 182(in Chinese with English abstract)

[5] Liu FT, Qu KX, Wu H, et al. Seismic tomography of the Chinese continent and adjacent region. Chinese Journal of Geophysics, 1989, 32(3) : 281~ 291(in Chinese with English abstract)

[6] Liu JH, Liu FT, Wu H, et al. The 3-D velocity image of the crust and the upper mantle in China south-north secismic belt. Chinese Journal of Geophysics, 1989, 32(3) : 143~ 151(in Chinese with English abstract)

[7] Sun RM, Liu FT, Liu JH.The seismic tomography in Sichuan China. Chinese Journal of Geophysics, 1991, 34(3) : 708~ 716(in Chinese with English abstract)

[8] Liu RF, Chen PS, Li Q. The 3-D velocity structure of the Yunnan and the adjacent area. Acta seismologica sinica, 1993, 15(1) 61~ 67(in Chinese with English abstract)

[9] Huang JL, Zheng SH, Zhao DP. The seismic tomography in Sichuan and Yunnan. Chinese Journal of Geophysics, 2001, 44(Suppl.) : 127~ 135 (in Chinese with English abstract)

[10] Ding ZF, He ZQ, Sun WG, et al. The 3-D velocity structure of the crust and upper mantle in the east of the Tibet and adjacent area. Chinese Journal of Geophysics, 1999, 42(2) : 197~ 205(in Chinese with English abstract)

[11] Xu Y, Liu FT, Liu JH, et al. Crustal structure and tectonic environment of strong earthquakes in the Tian-Shan earthquake Belt. Journal of Geophysics, 2000, 43(2) : 184~ 193(in Chinese with English abstract)

[12] Hilst RD, Widiyantoro S, Engdahl ER. Evidengce for deep mantle circulation from global tomography. Nature, 1997, 386: 578~ 584

[13] Hilst RD, Widiyantoro S, CreagerKC, et al. Deep subduction and aspherical variations in P-wavespeed at the base of Earth. s. GeodynamicsSeries, 1998, 28: 5~ 20

[14] Bijwaard H, Spakman W, Engdahl ER. Closing the gapbetween regional and global travel time tomography. J. Geophys. Res., 1998, 103: 30055 ~ 30078

[15] Zhao DP.Seismological structure of subduction zones and its implications for arc magmadism and dynamics. Physicsof Earth and Planetary Interiors, 2001,127: 197~ 214

[16] Zhao DP, Hasegawa A, Kanamori H. Deep structure of Japan subduction zone as drived from local, regional and teleseismic events. J. Geophys. Res., 1994, 99: 22313~ 22329

[17] Zhao DP, Hasegawa A, Horiuchi S. Tomography imaging of P and S wave velocity structure beneath northeastern Japan. J. Geophys. Res., 1992, 97: 19909~ 19928

[18] Cao JM, Zhu JS, Cai XL, et al. The three-dimensional earth. s model for Eurasia and West Pacific region. http:PPwww. igei. cdut. edu. cnPKeyanP ZHONGGUOSANWEI. HTM(2000) (in chinese)

[19] Lei JS, Zhou HL, Zhao DP. The 3-D velocity structure of P-wave in the crust and upper mantle beneath pamir and adjacent fegion. Chinese Journal of Geophysics, 2002, 45(6) : 802~ 811(in Chinese with English abstract)

[20] Lei JS, Zhou HL. 3-D structure of P wave in the upper mantle beneath southwestern China and its adjacent areas. Acta seismologica sinica, 2002, 24(2) : 126~ 134(in Chinese with English abstract)

[1] 朱介寿, 曹家敏, 蔡学林, 等. 东亚及西太平洋边缘海高分辨率面波层析成像. 地球物理学报,2002, 45(5) :646~ 664

[2] 朱介寿, 曹家敏, 蔡学林, 等. 中国及临近陆域海域地球内部三维结构及动力学研究. 地球科学进展, 2003, 18(4) :497~ 503

[3] 梁春涛. 东亚及邻区地幔体波层析成像: [硕士学位论文]. 成都: 成都理工大学, 2000

[4] 金安蜀, 刘福田, 孙水智. 北京地区地壳和上地幔三维 P 波速度结构. 地球物理学报, 1980, 23: 172~ 182

[5] 刘福田, 曲克信, 吴华, 等. 中国大陆及其邻近地区的地震层析成像. 地球物理学报, 1989, 32(3) : 281~ 291

[6] 刘建华, 刘福田, 吴华, 等. 中国南北地震带地壳和上地幔的三维速度图像. 地球物理学报, 1989,32(2) : 143~ 151

[7] 孙若昧, 刘福田, 刘建华. 四川地区的地震层析成像. 地球物理学报, 1991,34(6) : 708~ 716

[8] 刘瑞丰, 陈培善, 李强. 云南及其邻近地区三维速度图像. 地震学报, 1993,15(1) : 61~ 67

[9] 黄金莉, 郑斯华, 赵大鹏. 川滇活动构造区地震层析成像. 地球物理学报, 2001, 44(增刊) : 127~ 135

[10] 丁志峰, 何正勤, 孙为国, 等. 青藏高原东部及其边缘地区的地壳上地幔三维速度结构. 地球物理学报, 1999, 42(2) : 197~ 205

[11] 胥颐, 刘福田, 刘建华, 等. 天山地震带的地壳结构与强震构造环境. 地球物理学报, 2000, 43(2) : 184~ 193

[18] 曹家敏, 朱介寿, 蔡学林. 欧亚大陆及西太平洋地区三维地球模型的建立. http:PPwww. igei. cdut. edu. cnPKeyanPZHONGGUOSANWEI. HTM(2000)

[19] 雷建设, 周蕙兰, 赵大鹏. 帕米尔及邻区地壳上地幔P 波三维速度结构的研究. 地球物理学报, 2002, 45(6) : 802~ 811

[20] 雷建设, 周蕙兰. 中国西南及邻区上地幔 P 波三维速度结构. 地震学报, 2002, 24(2) : 126~ 134