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东亚北部地区现代板块构造的运动学分析

KINEMATIC ANALYSIS OF MODERN PLATE TECTONICS IN NORTHEASTERN ASIA

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【作者】 魏东平濑野徹三

【Author】 WEI DONG-PING(Graduate School at Beijing, University of Science and Technology of China. Beijing 100039)SENO TETSUZO(earthquake Research Institute, University of Tokyo, Tokyo, 113-0032)

【机构】 中国科学技术大学研究生院!北京100039东京大学地震研究所!东京113-0032

【摘要】 从原欧亚板块划出阿穆利亚微板块,并建立一个包括太平洋、北美、欧亚、鄂霍次克及菲律宾海等板块在内的6板块系统,利用地震滑移矢量,转换断层走向,洋中脊扩展速率,以及最新的GPS观测资料,采用Monte-Carlo盒子法,反演得到该6板块系统的欧拉运动矢量.本文得到的有关欧拉矢量为:AM-EU(60.42°N,123.25°E,0.025°/Ma),AM-OK(53.20°N,141.95°E,0.476°/Ma)以及AM-PH(50.84°N,158.13°E,1.204°/Ma),AM-EU的欧拉运动极点位于贝加尔隆起的东北及斯塔诺夫山脉的西北,并给出在贝加尔隆起有0.4-0.7mm/a的扩张,与从地质学证据得到的估计结果一致;由AM-OK及AM-PH欧拉运动矢量可以分别得到日本海东缘的6-15mm/a及日本南海地槽带的51-66mm/a收敛速率,与最新的GPS观测结果并不一致.因此,东亚北部地区存在独立的南中国微板块及其它亚尺度的微板块,可以更好地描述该地区现今板块构造的运动规律.

【Abstract】 The Amurian microplate can be discriminated from the Eurasian plate.We thus set up a 6-plate system including Pacific, North American, Eurasian,Philippine Sea, Okhotsk and Amurian plates. By means of the earthquake slip vectors,transform fault azimuths, spreading rates and the latest GPS data, we get the Eulervectors describing motions of this 6-plate system by using the Monte-Carlo Boxmethod. Some Euler vectors obtained in this study are: AM-EU (60.42°N, 123.25°E,0.025°/ Ma), AM--OK (53.20°N, 141.95°E, 0. 476°/ Ma), and AM-PH (50.84°N,158.13°E, 1.204°/ Ma). The AM-EU pole is located to northeast of the Baikal Riftand to the northwest of the Stanovoy Range. The results of this study imply that theBaikal Rift is extending at a rate of 0.4-0.7mm / a, which are consistent with thegeologically estimated rates. The AM-OK and AM-PH Euler vectors show 6-15mm/a of convergence rate in the eastern margin of the Japan Sea and 51-66mm/ a ofconvergence rate along the Nankai Trough, respectively, which are not consistent withthe latest observed GPS data. An independent South China microplate or othermicroplates, which are discriminated from the Eurasian plate, are accordingly helpfulin describing the current plate motions of the Northeastern Asia.

【基金】 国家自然科学基金!49804006;中国教育部留学基金
  • 【文献出处】 地球物理学报 ,Chinese Journal of Geophysics , 编辑部邮箱 ,2000年01期
  • 【分类号】P542
  • 【被引频次】5
  • 【下载频次】186
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