[ghsc-seminars] Tomorrow @ 10am, GHSC Seminar: Kyle Withers, USGS, Golden

[Benjamin Mirus]

*"**Validation of Deterministic Broadband (0-5 Hz) *
*Ground Motion and Variability from 3-D Dynamic *
*Rupture Simulations along Non-planar Faults"*

*​Kyle Withers*
*Mendenhall Postdoctoral Fellow*
*USGS Geologic Hazards Science Center Golden, CO*

3D wave propagation simulations provide information about earthquake ground
motions for regions with sparse or non-existent ground motion sampling, and
therefore have many applications, such as earthquake preparedness and
response planning, and physics-based seismic hazard assessment. Here, we
model the dynamic rupture propagation of scenario earthquakes along both
strike-slip and dipping fault plane geometries employing fault roughness.
We study broadband ground motion from these deterministic simulations in
varying complexity media in the subsequent wave propagation. We find that
we can generate realistic broadband ground motion (up to 5-7.5 Hz), as
compared with empirical relations, (as characterized by the median and
standard deviation) such as ground motion prediction equations (GMPEs). We
observe several informative trends that may help guide the future
development of GMPEs; for example, ground motion variability is strongly
affected by the addition of small-scale media heterogeneity, reducing
otherwise large values of intra-event standard deviation closer to those of
empirical observations. Finally, we also compare our synthetic ground
motion with several proxy metrics (for example, the period-to-period
correlation of spectral acceleration) as well as strong ground motion
records of the 1994 Mw 6.7 Northridge earthquake, and determine the
relative significance of media complexity with variation in period.
Existing and future results from 3D simulations may become increasingly
important to USGS Earthquake Hazards products, including the National
Seismic Hazard Model and ShakeMap, and we highlight various potential
applications from this work.

*Tuesday, *
*June 19th**, 2018*
*​10​*
*​a​*
*m** (Mountain Time)*
*USGS, 1711 Illinois Street, Golden, CO*
*Entry Level Seminar Room (204)*

*Note: Please arrive *~5 minutes early* and *bring photo ID* for
airport-style security measures now in place at the USGS building.

Thank you,
GHSC Seminar Committee

Mirus, Ben - bbmirus at usgs.gov
Josh Rigler - erigler at usgs.gov
Oliver Boyd - olboyd at usgs.gov <oboyd at usgs.gov>
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