Advertisement

Acta Seismologica Sinica

, Volume 17, Issue 3, pp 322–333 | Cite as

Assessing current faulting behaviors and seismic risk of the Anninghe-Zemuhe fault zone from seismicity parameters

  • Yi Gui-xi 
  • Wen Xue-ze 
  • Fan Jun 
  • Wang Si-wei 
Article

Abstract

Using the data of regional seismic network, this paper analyzes the current faulting behaviors of different segments of the Anninghe-Zemuhe fault zone, western Sichuan, and identifies the likely risky segments for potential large earthquakes. The authors map the probable asperities from the abnormally low b-value distribution, develop and employ a method for identifying current faulting behaviors of individual fault segment from the combinations of multiple seismicity parameter values, and make an effort to estimate the average recurrence intervals of characteristic earthquakes by using the parameters of magnitude-frequency relationship of the asperity segment. The result suggests that the studied fault zone contains 5 segments of different current faulting behaviors. Among them, the Mianning-Xichang segment of the Anninghe fault has been locked under high stress, its central part is probably an asperity with a relatively large scale. The Xichang-Puge segment of the Zemuhe fault displays very low seismicity under low stress. Both the locked segment and the low-seismicity segment can be outlined on the across-profile of relocated hypocenter depths. The Mianning-Xichang segment is identified to be the one with potential large earthquake risk, for which the average recurrence interval between the latest M=6.7 earthquake in 1952 and the next characteristic event is estimated to be 55 to 67 years, and the magnitude of the potential earthquake between 7.0 and 7.5. Also, it has been preliminarily suggested that for a certain fault segment, its faulting behaviors may change and evolve with time gradually.

Key words

seismicity parameter faulting behavior asperity potential seismic risk Anninghe-Zemuhe fault zone 

CIC number

P315.2 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Aki K. 1984. Asperities, barriers, characteristic earthquakes and strong motion prediction [J]. J Geophys Res, 89(B7): 5867–5872.Google Scholar
  2. CHEN P, CHEN H. 1989. Scaling law and its applications to earthquake statistical relations [J] Tectonophysics, 166: 53–72.CrossRefGoogle Scholar
  3. Department of Earthquake Disaster Prevention, China Seismological Bureau. 1999. The Catalogue of Mmodern Earthquakes [M]. Beijing: Chinese Science and Technology Press, 1–637 (in Chinese).Google Scholar
  4. Department of Earthquake Disaster Prevention, State Seismological Bureau. 1995. The Catalogue of Chinese historical Strong Earthquakes [M]. Beijing: Seismological Press, 1–514 (in Chinese).Google Scholar
  5. DING Guo-yu, TIAN Qin-jian, KONG Fan-chen, et al. 1993. Segmentation of Active Fault—Principles, Methods and Applications [M]. Beijing: Seismological Press, 1–143 (in Chinese).Google Scholar
  6. Molnar P. 1979. Earthquake recurrence intervals and plate tectonics [J]. Bull Seismol Soc Am, 69: 115–133.Google Scholar
  7. Papazachos B C. 1992. A time and magnitude predictable model for generation of shallow earthquakes in the Aegean area [J]. Pure Appl Geophys, 138(2): 287–308.CrossRefGoogle Scholar
  8. Prugger A F, Gendzwill D J. 1988. Microearthquake location: a nonlinear approach that makes use of a simplex stepping procedure [J]. Bull Seism Soc Am, 78(2): 799–815.Google Scholar
  9. Scholz C H. 1968. The frequency-magnitude relation to microfracturing in rock and its relation to earthquakes [J]. Bull Seism Soc Am, 58: 399–415.Google Scholar
  10. Shimazaki K, Nakata T. 1980. Time-predictable recurrence of large earthquakes [J]. Geophys Res Lett, 7: 279–282.Google Scholar
  11. Urbancic T I, Trifu C I, Long J M, et al. 1992. Space-time correlation of b values with stress release [J]. Pure App Geophys, 139: 449–462.CrossRefGoogle Scholar
  12. Wells D L, Coppersmith K J. 1994. New empirical relationships among magnitude, rupture length, rupture width, rupture area, and surface displacement [J]. Bull Seism Soc Am, 84: 974–1002.Google Scholar
  13. WEN Xue-ze, DU Ping-shan, LONG De-xiong. 2000. New evidence of paleoearthquakes and date of the latest on the Xiaoxiangling mountain segment of the Anninghe fault zone [J]. Seismology and Geology, 22(1): 1–8 (in Chinese).Google Scholar
  14. WEN Xue-ze, XU Xi-wei, ZHENG Rong-zhang, et al. 2001. Late Quaternary faulting and large earthquake recurrence interval of the Moxi fault [A]. In: LU Yan-chou, et al ed. Neotectonics and Environment [C]. Beijing:, Seismological Press, 255–266 (in Chinese).Google Scholar
  15. WEN Xue-ze. 2000. Character of rupture segmentation of the Xianshuihe-Anninghe-Zemuhe fault zone, western Sichuan. [J]. Seismology and Geology, 22(4): 239–249 (in Chinese).Google Scholar
  16. Wiemer S, Wyss M. 1997. Mapping the frequency-magnitude distribution in asperities: An improved technique to calculate recurrence times [J]. J Geophys Res, 102(B7): 15115–15128.CrossRefGoogle Scholar
  17. Wyss M, Schorlemmer D, Wiemer S. 2000. Mapping asperities by minima of local recurrence time: San Jacinto-Elsinore fault zones [J]. J Geophys Res, 105(B4): 7829–7844.CrossRefGoogle Scholar
  18. XU Xi-wei, WEN Xue-ze, ZHENG Rong-zhang. 2003. Pattern of latest tectonic motion and its dynamics for active blocks in Sichuan-Yunnan region [J]. Science in China (Series D), 33 (Suppl.): 151–162 (in Chinese).Google Scholar
  19. YI Gui-xi, WEN Xue-ze. 2000. Application of the time-and magnitude predictable model to seismic hazard assessment in segmentation of the north-south seismic belt [J]. Earthquake, 20(1): 93–101 (in Chinese).Google Scholar
  20. YI Gui-xi, WEN Xue-ze. 2000. Earthquake recurrence behaviors on entire active fault zones and their relations to those on individual fault-segments [J]. Acta Seismologica Sinica, 13(5): 563–574.Google Scholar
  21. ZHANG Pei-zhen, DENG Qi-dong, ZHANG Guo-min, et al. 2003. Strong earthquake activities and active tectonic blocks of the Chinese mainland [J]. Science in China (Series D), 33(Suppl): 12–20 (in Chinese).Google Scholar

Copyright information

© Acta Seismologica Sinica 2004

Authors and Affiliations

  • Yi Gui-xi 
    • 1
    • 2
  • Wen Xue-ze 
    • 2
  • Fan Jun 
    • 2
  • Wang Si-wei 
    • 2
  1. 1.Chengdu University of TechnologyChengduChina
  2. 2.Earthquake Administration of Sichuan ProvinceChengduChina

Personalised recommendations