J Shanghai Jiaotong Univ Sci

Journal of Shanghai Jiaotong University(Science) >

2013 , Vol. 18 >Issue 6: 724 - 728

DOI: https://doi.org/10.1007/s12204-013-1456-4

Analysis on Intensity Zonation in Thick Loess Region

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  • (1. Key Laboratory of Loess Earthquake Engineering, Gansu Earthquake Administration, China Earthquake Administration, Lanzhou 730000, China; 2. Lanzhou Institute of Seismology, China Earthquake Administration, Lanzhou 730000, China; 3. Geotechnical Disaster Prevention Engineering Technology Research Center of Gansu Province, Lanzhou 730000, China; 4. Key State laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China)

Online published: 2013-12-18

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Abstract

The earthquakes, which occurred in Haiyuan, Tangshan and Wenchuan, have caused serious damages in the loess area and the abnormal intensity sites are commonly found during the earthquakes. The investigation of the actual earthquake damages and character analysis on sites shows that the topography, loess overburden and underground water level and many other factors affect the intensity. In this paper, the thickness of loess overburden of Tianshui City is achieved by inversion algorithm based on site exploration and microtremor test; the amplification effect of peak ground motion acceleration is calculated using numerical method; a complete formula is obtained through summarizing previous achievements and is used to calculate the abnormal intensity under the multifactorial influence. Finally, a seismic intensity anomaly distribution map is plotted applying the graphic information system (GIS) software in Maiji District, Tianshui City. Through the practical investigation of earthquake disaster, it is found that the figure fits the distribution of actual intensity anomaly very well.

Key words： intensity; loess; microtremor; amplification effect; zonation

Cite this article

ZHANG Ze-zhong1,2 (张泽忠), WU Zhi-jian1,2,3* (吴志坚), CHEN Tuo4 (陈 拓), LEI Tian1,2 (雷 天) . Analysis on Intensity Zonation in Thick Loess Region[J]. Journal of Shanghai Jiaotong University(Science), 2013 , 18(6) : 724 -728 . DOI: 10.1007/s12204-013-1456-4

References

[1] Zhang Zhen-zhong. Forecast of seismic disasters in loess area [M]. Beijing: Seismological Press, 1999 (in Chinese).
[2] Wang Lan-min, Wu Zhi-jian. Influence of site condition on seismic amplification effects during the Wenchuan earthquake [J]. Journal of Civil, Architectural & Environmental Engineering, 2010, 32(sup2):175-178 (in Chinese).
[3] Fang Jian-chun. Disaster and rescue of Haiyuan earthquake in 1920 [J]. Journal of Ningxia Teachers University:Social Science, 2010, 31(5): 51-56 (in Chinese).
[4] Wang Lan-min. Loess dynamics [M]. Beijing: Earthquake Press, 2003 (in Chinese).
[5] Shi Yu-cheng,Wang Lan-min, Zhang Ying. Effects of overburden thickness and topography of loessial sites on earthquake ground motion [J]. Northwestern Seismological Journal, 1999, 21(2): 203-208 (in Chinese).
[6] Yuan Zhong-xia, Wang Lan-min, Zhong Xiu-mei,et al. Safety guide for farmer’s house [M]. Lanzhou:Lanzhou University Press, 2010 (in Chinese).
[7] Xu Jian-cong, Jian Wen-bin, Shang Yue-quan. Study on formation mechanism and propagating characteristics of ground micro-tremor [J]. Journal of Zhejiang University: Engineering Science, 2005, 39(1): 33-38(in Chinese).
[8] Nakamura Y A. A method for dynamic characters estimation of subsurface using microtremors on the ground surface [J]. Tokyo QR of RTRI, 1989, 30(1):25-33.
[9] Tokimatsu K, Miyadera Y. Characteristics of Rayleigh waves in microtremors and their relation to underground structures [J]. Journal of Structural Construction Engineering, 1992, 439: 81-87 (in Japanese).
[10] Hu Yu-xian. Earthquake engineering [M]. Beijing:Seismological Press, 2006 (in Chinese).
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