[ghsc-seminars] Thursday April 5 @ 10am, USGS-GHSC Seminar: Valerie Sahakian

[Mirus, Benjamin]

*Towards region-specific ground-motion models: physical representations for
path effects in GMPEs*

*Valerie Sahakian, USGS Menlo Park*

Path-specific ground-motion models, or fully non-ergodic ground-motion
prediction equations (GMPEs) are the next step in improving ground-motion
estimation, in particular for critical facilities where design targets fall
at very low probabilities of exceedance. Statistical approaches in regions
with high seismicity rates have been shown to be robust methods for moving
towards fully non-ergodic models, however in seismically quiet regions,
these methods will not reduce uncertainty in path terms; we work to include
known, regional properties into GMPEs to reduce uncertainty. To do this, we
compare GMPE path residuals with metrics that represent the effects of
crustal properties (i.e. crustal velocity, and quality factor or
attenuation). We find that structural heterogeneity in crustal velocity
affects ground-motion amplitudes at longer source-to-station distances, and
that this may be included into GMPEs to reduce uncertainty.

*Thursday, April 5th, 2018*
*10-11am​ **(Mountain Time)*
*Entry Level Seminar Room*
*USGS G**eologic Hazards Science Center*
*1711 Illinois Street, Golden, CO*

*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

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