| Mechanism of the June 4, 2000 Southern Sumatra, Indonesia, earthquake |
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| 作者姓名： | 周云好 许力生 陈运泰 |
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| 作者单位： | ZHOU Yun-hao XU Li-sheng CHEN Yun-tai Institute of Geophysics，China Seismological Bureau，Beijing 100081，China |
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| 基金项目： | National Science Foundation of China under grant No.49904004，the SSTCC Climbing project 95-S-05. |
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| 摘 要： | Introduction The June 4, 2000 southern Sumatra, Indonesia, earthquake (16h28min26.2s UTC, 4.72, 102.09, 33 km, MS=8.0 IRIS]) occurred under the Indian Ocean, near the Mentawai fault, along the well-known Sumatran subduction zone and the great Sumatran fault, all of which trend northwest-southeast. 1 800 houses were totally destroyed, 10 196 were heavily damaged, and 18 378 were slightly damaged by the earthquake. At least 97 people were killed, 1 900 were injured, and 122 000 were left…
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| 收稿时间： | 14 December 2001 |
| 修稿时间： | 6 February 2002 |
Mechanism of the June 4, 2000 Southern Sumatra, Indonesia, earthquake |
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| Zhou Yun-hao , Xu Li-sheng and Chen Yun-tai.Mechanism of the June 4, 2000 Southern Sumatra, Indonesia, earthquake[J].Acta Seismologica Sinica(English Edition),2002,15(5):484-492. |
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| Authors: | Zhou Yun-hao Xu Li-sheng and Chen Yun-tai |
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| Institution: | Institute of Geophysics, China Seismological Bureau, Beijing 100081, China |
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| Abstract: | Mechanism of the June 4, 2000 southern Sumatra, Indonesia, earthquake (MS=8.0) are estimated from teleseismic body waves recorded by long period seismograph stations of the global seismic network. This solution is more reasonable than those reported by USGS, Harvard CMT and ERI of University of Tokyo. The best double-couple component of this earthquake is 1.51021 Nm, the compensated linear vector dipole component is 1.21020 Nm, and the explosion component is 5.91019 Nm. The focal mechanism is mainly left-lateral strike-slip, with a small thrust component. Nodal plane I: The strike is 199? the dip, 82? and the rake, 5? Nodal plane II: The strike is 109? the dip, 85, and the rake, 172. P axis: The azimuth is 154 and the plunge, 2; T axis: The azimuth is 64 and the plunge, 10; B axis: The azimuth is 256 and the plunge, 80. The P-waveforms recorded at different stations show prominent directivity. The directivity shows that the Nodal plane I is the fault plane, and that the earthquake ruptured unilaterally from the northeast to the southwest, nearly perpendicular to the strike of the Java trench. |
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| Keywords: | Sumatra earthquake moment tensor mechanism directivity |
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