Special Seminar: Towards the Development of Static Ground Displacement & Transient Ground Strain ShakeMaps
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David Wald
USGS National Earthquake Information Center
- Date & Time
- Location
- Hybrid In Person and Online seminar via Microsoft Teams
- Summary
We are working towards two new tools to complement the U.S. Geological Survey ShakeMap product suite, namely (1) static ground displacement (SGD) and (2) transient ground strain (TGS). Damage to shallow, buried structures and lifelines can be caused both by dynamic strains (primarily axial strains) and permanent deformation (including broad uplift, localized faulting, or ground failure). Detailed SGD and TGS maps will greatly improve the characterization of both causes. SGD maps require vector displacement representation, static deformation predictions rather than response spectral estimates, and geodetic observations. TGS ShakeMaps require strain calculations, often approximated as e=PGV/C, where PGV is peak ground velocity, and C is a site's shear velocity; yet, rigorous strain calculations require computing C as the apparent velocity. TGS ShakeMaps will require conditioning on TGS observations, including strainmeters, seismic arrays, and distributed acoustic sensing.