[ghsc-seminars] GHSC Seminar, Tuesday June 19th @ 10am: Kyle Withers, USGS, Golden

[Rigler, Erin (Josh)]

*"*
*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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