A global hybrid VS30 map with a topographic slope–based default and regional map insets

David C. Heath; David J. Wald; C. Bruce Worden; Eric M. Thompson; Gregory M. Smoczyk

doi:10.1177/8755293020911137

A global hybrid V_S30 map with a topographic slope–based default and regional map insets

Earthquake Spectra

By: David C. Heath, David J. Wald, C. Bruce Worden, Eric M. Thompson, and Gregory M. Smoczyk

https://doi.org/10.1177/8755293020911137

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Abstract

Time-averaged shear wave velocity over the upper 30 m of the earth’s surface (V_S30) is a key parameter for estimating ground motion amplification as both a predictive and a diagnostic tool for earthquake hazards. The first-order approximation of V_S30 is commonly obtained through a topographic slope–based or terrain proxy due to the widely available nature of digital elevation models. However, better-constrained V_S30 maps have been developed in many regions. Such maps preferentially employ various combinations of V_S30 measurements, higher-resolution elevation models, lithologic, geologic, geomorphic, and other proxies and often utilize refined interpolation schemes. We develop a new hybrid global V_S30 map database that defaults to the global slope-based V_S30 map, but smoothly inserts regional V_S30 maps where available. In addition, we present comparisons of the default slope-based proxy maps against the new hybrid version in terms of V_S30 and amplification ratio maps, and uncertainties in assigned V_S30 values.

Suggested Citation

Heath, D.C., Wald, D.J., Worden, C., Thompson, E.M., and Smoczyk, G.M., 2020, A global hybrid VS30 map with a topographic slope–based default and regional map insets: Earthquake Spectra, v. 36, no. 3, p. 1570-1584, https://doi.org/10.1177/8755293020911137.

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Additional publication details
Publication type	Article
Publication Subtype	Journal Article
Title	A global hybrid VS30 map with a topographic slope–based default and regional map insets
Series title	Earthquake Spectra
DOI	10.1177/8755293020911137
Volume	36
Issue	3
Publication Date	June 09, 2020
Year Published	2020
Language	English
Publisher	Sage
Contributing office(s)	Geologic Hazards Science Center
Description	15 p.
First page	1570
Last page	1584
Country	Mexico, United States