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Application of the stress evolutionary model along the Xiaojiang fault zone in Yunnan Province, Southeast China

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Języki publikacji
EN
Abstrakty
EN
The Xiaojiang fault zone constitutes part of the major Xianshuihe¨CXiaojiang left lateral structure that bounds the rhombic-shaped block of Yunnan¨CSichuan to the east. Long strike slip fault zones that have repeatedly accommodated intense seismic activity, constitute a basic feature of southeast China. Known historical earthquakes to have struck the study area are the 1713 Xundian of M6.8, 1725 Wanshou mountain of M6.8, the 1733 Dongchuan of M7.8, and the strongest one, the 1833 Songming of M8.0. Although instrumental record did not report events of this magnitude class, the 18th century clustering as well as the 19th century large event prompted the investigation of stress transfer along this fault zone. Coulomb stress changes were calculated assuming that earthquakes can be modeled as static dislocations in an elastic half-space, and taking into account both the coseismic slip in strong (M ˇÝ 6.8) earthquakes and the slow tectonic stress buildup along the major fault segments. Geological and geodetic data are used to infer the geometry of these faults and long term slip rates on them, as well as for the fault segments that slipped. Evidence is presented that the strong historical events as well as the ones of smaller magnitude that occurred during the instrumental era, are located in areas where the static stress was enhanced. By extending the calculations up to present, possible sites for future strong events are identified.
Czasopismo
Rocznik
Strony
577--593
Opis fizyczny
Twórcy
autor
autor
  • Department of Geophysics, Aristotle University of Thessaloniki, Thessaloniki, Greece, paradis@gmail.com
Bibliografia
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  • Harris, R., and R. Simpson, 1996, In the shadow of 1857: The effect of the great Ft Tejon earthquake on subsequent earthquakes in Southern California, Geophys. Res. Lett. 23, 229-232.
  • Harris, R., and R. Simpson, 1998, Suppression of large earthquakes by stress shadows: a comparison of Coulomb and rate-and-state failure, J. Geophys. Res. 103, 24,439-24,452.
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  • Peng, L., 1993, Xianshuihe-Xiaojiang Fault Belt, Seism. Press Publ., Beijing 36, 144-145.
  • Reasenberg, A., and R. Simpson, 1992, Response of regional seismicity to the static stress change produced by the Loma Prieta earthquake, Science 255, 1687-1690.
  • Shen, J., Y. Wang and F. Song, 2003, Characteristics of the active Xiaojiang fault zone in Yunnan, China: a slip boundary for the southeastward escaping Sichuan-Yunnan Block of the Tibetan Plateau, J. Asian Earth Sci. 21, 1085-1096.
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  • Wang, E., B.C. Burchfiel, L.H. Royden, L. Chen, J. Chen and W. Lin, 1998, Late Cenozoic Xianshuihe-Xiaojiang, Red River, and Dali fault systems of southwestern Sichuan and central Yunnan, China, GSA Special Paper 327, 108 pp.
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  • Zhang, S., 1988a, The study of the rupture zone of 1833 Songming M = 8 earthquake, Study on the earthquake faults in China, Xinjiang People's Press, Urumqi, China, 330 pp. (in Chinese).
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Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-article-BSL7-0021-0060
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