Methodology and Assessment of Proxy-Based V<sub>s30</sub> Estimation in Sichuan Province, China

Wen Wu; Jifu Liu; Lanlan Guo; Zhifei Deng

doi:10.1007/s13753-020-00253-2

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Article Navigation > International Journal of Disaster Risk Science > 2020 > 11(1): 133-144

Wen Wu, Jifu Liu, Lanlan Guo, Zhifei Deng. Methodology and Assessment of Proxy-Based Vs30 Estimation in Sichuan Province, China[J]. International Journal of Disaster Risk Science, 2020, 11(1): 133-144. doi: 10.1007/s13753-020-00253-2

Citation:

Wen Wu, Jifu Liu, Lanlan Guo, Zhifei Deng. Methodology and Assessment of Proxy-Based V_s30 Estimation in Sichuan Province, China[J]. International Journal of Disaster Risk Science, 2020, 11(1): 133-144. doi: 10.1007/s13753-020-00253-2

Citation:

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Methodology and Assessment of Proxy-Based V_s30 Estimation in Sichuan Province, China

doi: 10.1007/s13753-020-00253-2

Wen Wu^1,2,4,
Jifu Liu^{1,2
,
,},
Lanlan Guo^{2,3
,
,},
Zhifei Deng^1,2

1 Key Laboratory of Environmental Change and Natural Disaster of Ministry of Education, Beijing Normal University, Beijing 100875, China;
2 Faculty of Geographical Science, Beijing Normal University, Beijing 100875, China;
3 State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, Beijing 100875, China;
4 Leshan Natural Resources Bureau, Leshan 614000, Sichuan, China

Funds:

This work is financially supported by the National Key Research and Development Program of China (Grant No. 2018YFC1509003) and the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDA20060402).

Available Online: 2021-04-26

Abstract

Abstract

Although time-averaged shear wave velocity to the depth of 30 m (V_s30) is an important indicator of earthquake site effects, it is difficult to obtain. Several proxies have been used either individually or in combination to infer V_s30 values during seismic hazard estimation under limited observational conditions. Sichuan Province is an area highly prone to earthquakes. Complex geological structures and lack of drilling sites mean that it is particularly important to establish a suitable approach for the estimation of V_s30 values for site classification. This study compared the application of three proxy-based approaches—geology-based, topographic slope-based, and terrain-based—to the estimation of V_s30 values in Sichuan Province. The results revealed that the residual between the measured logV_s30 values and the estimations derived from the terrain-based approach was smallest, indicating best predictability. Stability analysis of the three approaches also showed that the terrain-based approach performed best. However, its performance in the plain area was poor, that is, the V_s30 values were mostly underestimated. This might indicate that the old strata, hard rock, and alluvial deposits formed by Quaternary glacier sediments were not identified appropriately in the plain area, highlighting the need for localized corrections.
- China,
- Earthquake site effects,
- Proxy-based V_s30 estimation,
- Sichuan province

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References(30)

References

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