A global hybrid VS30 map with a topographic slope–based default and regional map insets
| Autor: | Eric M. Thompson, C. Bruce Worden, David J. Wald, Gregory M. Smoczyk, David C Heath |
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| Rok vydání: | 2020 |
| Předmět: | |
| Zdroj: | Earthquake Spectra. 36:1570-1584 |
| ISSN: | 1944-8201 8755-2930 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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