Seismisite Toolkit

Extrapolating VS30 from Shallow Boreholes

Input Borehole Profile

Import Borehole Profiles

Q&A

How accurate does a extrapolated VS30 hold?

What model is the extrapolation method of this website based on?

How can the information of location slope, geotechnical profile, and geologic profile of a borehole benefits the extrapolation?

Can this tool extrapolate VS20 or VS of other depth values?

Can this tool extrapolate the VS profile of a borehole？

New VS30 Map for Mainland China (Ver2024)

The VS30 map are developed using the 2024 refined SCK model, based on 7,939 mainland China borehole measurements and SRTM30 DEM data.

Extent：Mainland China

Data type：DBF

Resolution：30 arcsec

License type：CC BY

This work is licensed under a Creative Commons Attribution 4.0 International License.

Citation：Zhou, J., L. Li, X. Li, N. Xi, and X. Tian (2024). A 30 Arcsec Resolution VS30 Map for Mainland China Using Refined Topographic Slope-Based Cokriging (SCK) Model, Bull. Seismol. Soc. Am. XX,1–17, doi: 10.1785/0120240104

Q&A

What is VS30?

What is the SCK model?

The benefits of VS30 map using the SCK model.

Dataset

The Strong-Motion Dataset (PGA, PGV, and Site VS30) of 2022 M6.8 Luding, China Earthquake

Extent：300 km of the epicenter

Data type：Microsoft Excel

License type：CC BY-SA

This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.

Citation：Zhou J., N. Xi, C. C. Kang, L. Li, K. Chen, X. Tian, C. Wang, and J. F. Tian (2023). An Accessible Strong-Motion Dataset (PGA, PGV, and Site VS30) of 2022 M6.8 Luding, China Earthquake. Earthquake Science, 36, doi: 10.1016/j.eqs.2023.01.001

VS30 Map for Pakistan and Kashmir

Extent：Pakistan and Kashmir

Data type：Microsoft Excel

Resolution：0.1 arcdegree

License type：CC BY-SA

This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.

Citation：Zhou J., L. Li, G. Y. Xu, C. L. Li, C. Wang, and X. Tian (2021). Evaluating Earthquake Hazard and Risk in Pakistan: Institute of Geophysics, CEA Seismic Risk Assessment for Countries along the Belt and Road Report, 2021-001, 80p.

California VS30 dataset of Boore (2003)

Extent：California, USA

Data type：Microsoft Excel

License type：CC BY

This work is licensed under a Creative Commons Attribution 4.0 International License.

Citation：Boore, D. M. (2003). A compendium of P- and S-wave velocities from surface-to-borehole logging: Summary and reanalysis of previously published data and analysis of unpublished data, U.S. Geol. Surv. Open-File Rept. 03-191, 13 pp.