Acta Seismologica Sinica

, Volume 15, Issue 5, pp 484–492 | Cite as

Mechanism of the June 4, 2000 Southern Sumatra, Indonesia, earthquake

  • Zhou Yun-hao 
  • Xu Li-sheng 
  • Chen Yun-tai 
Article
Received:
Revised:
Accepted:

Abstract

Mechanism of the June 4, 2000 southern Sumatra, Indonesia, earthquake (M S=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 1.5×1021 Nm, the compensated linear vector dipole component is 1.2×1020 Nm, and the explosion component is −5.9×1019 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.

Key words

Sumatra earthquake moment tensor mechanism directivity 

CLC number

P315.2 
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References

  1. Aki K, Richards P G. 1980. Quantitative Seismology. Theory and Methods [M]. San Francisco: W. H. Freeman and Co, 28–119.Google Scholar
  2. CHEN Yun-tai, XU Li-sheng, LI Xu, et al. 1996. Source process of the 1990 Gonghe, China, earthquake and tectonic stress field in the northeastern Qinghai-Xizang (Tibetan) plateau [J]. Pure Appl Geophys, 146: 697–715.CrossRefGoogle Scholar
  3. CHEN Yun-tai, XU Li-sheng. 2000. A time domain inversion technique for the tempo-spatial distribution of slip on a finite fault plane with applications to recent large earthquakes in Tibetan Plateau [J]. Geophys J Int, 143: 407–416.CrossRefGoogle Scholar
  4. Fauzi, McCaffrey R, Wark D, et al. 1996. Lateral variation in slab orientation beneath Toba Caldera, northern Sumatra [J]. Geophys Res Lett, 23: 443–446.CrossRefGoogle Scholar
  5. Fitch T J. 1972. Plate convergence, transcurrent faults, and internal deformation adjacent to Southeast Asia and the Western Pacific [J]. J Geophys Res, 77: 4432–4460.Google Scholar
  6. Katili J A, Hehuwart F. 1967. On the occurrence of large transcurrent earthquakes in Sumatra, Indonesia [J]. Osaka Univ J Geosci, 10: 5–7.Google Scholar
  7. Kennett B L N. 1980. Seismic waves in a stratified half space—II. Theoretical seismograms [J]. Geophys J R astr Soc, 61: 1–10.Google Scholar
  8. Kennett B L N, Kerry N J. 1979. Seismic waves in a stratified half space [J]. Geophys J R astr Soc, 57: 557–583.Google Scholar
  9. Kennett B L N. 1980. Seismic waves in a stratified half space—II. Theoretical seismograms [J]. Geophys J R astr Soc, 61: 1–10.Google Scholar
  10. Kennett B L N, Engdahl E R. 1991. Travel times for global earthquake location and phase identification [J]. Geophys J Int, 105: 429–465.CrossRefGoogle Scholar
  11. Langston C A, Helmberger D V. 1975. A procedure for modeling shallow dislocation sources [J]. Geophys J R astr Soc, 42: 117–130.Google Scholar
  12. Newcomb K R, McCann W R. 1987. Seismic history and seismotectonics of the Suda Arc [J]. J Geophys Res, 92: 421–439.CrossRefGoogle Scholar
  13. Pan T C, Megawati K, Brownjohn J M W, et al. 2001. The Bengkulu, southern Sumatra, earthquake of 4 June 2000 (M W=7.7): Another warning to remote metropolitan areas [J]. Seism Res Lett, 72: 171–185.Google Scholar
  14. Tregoning P, Brunner F K, Bock Y, et al. 1994. First geodetic measurement of convergence across the Java Trench [J]. Geophys Res Lett, 21: 2135–2138.CrossRefGoogle Scholar
  15. XU Li-sheng, CHEN Yun-tai. 1997. Source parameters of the Gonghe, Qinghai Province, China, earthquake from inversion of digital broadband waveform data [J]. Acta Seismologica Sinica, 10(2): 143–159 (in Chinese).Google Scholar
  16. XU Li-sheng, CHEN Yun-tai. 1999. Tempo-spatial rupture process of the 1997 Mani, Xizang (Tibet), China earthquake of M S=7.9 [J]. Acta Seismologica Sinica 12(5): 495–506 (in Chinese).Google Scholar
  17. Zachariasen J, Sieh K, Taylor F W, et al. 1999. Submergence and uplift associated with the giant 1833 Sumatran subduction earthquake: Evidence from coral microatolls [J]. J Geophys Res, 104: 895–919.CrossRefGoogle Scholar

Copyright information

© Acta Seismologica Sinica 2002

Authors and Affiliations

  • Zhou Yun-hao 
    • 1
  • Xu Li-sheng 
    • 1
  • Chen Yun-tai 
    • 1
  1. 1.Institute of GeophysicsChina Seismological BureauBeijingChina

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