[ghsc-seminars] GHSC Seminar, Tuesday June 19th @ 10am: Kyle Withers, USGS, Golden
Rigler, Erin (Josh)
erigler at usgs.gov
Thu Jun 14 15:05:05 UTC 2018
*"*
*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*
*10am*
* (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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