›› 2012, Vol. 33 ›› Issue (6): 1912-1916.

• Numerical Analysis • Previous Articles     Next Articles

Inversing study of overburden thickness in loess area of Tianshui

ZENG Li-feng1，WU Zhi-jian1, 2, 3，CHEN Tuo4，HUO Yuan-kun5   

  1. 1. Lanzhou Institute of Seismology, China Earthquake Administration, Lanzhou 730000, China; 2. Key Laboratory of Loess Earthquake Engineering, China Earthquake Administration, Lanzhou 730000, China; 3. Geotechnical Disaster Prevention Engineering Technology Research Center of Gansu Province, Lanzhou 730000, China; 4. Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China； 5. Shanghai New Construction Architectural Design Co., Ltd., Shanghai 200030, China
  • Received:2011-11-28 Online:2012-06-11 Published:2012-06-14

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Abstract: Based on the microtremor observation data of 539 measuring points in Tianshui, horizontal-to-vertical spectral ratio and the predominant frequency are analyzed. According to the geological records of 59 boreholes and shear wave velocity distribution, two methods including the quarter-wave length and statistical relationship between overburden thickness and predominant frequency are applied to inverse the overburden thickness. The results show that the quarter-wave length has great flexibility to the third and the fourth terraces with a thicker overburden and single stratum; high accurate formula simplifying the influence of shear wave velocity is drawn with the method of the statistical relationship between the overburden thickness and the predominant frequency; and it is suitable for the whole studied area.

Key words: loess area, overburden, microtremor, predominant frequency

CLC Number: 

  • TU 444
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