USGS - science for a changing world

Pacific Coastal and Marine Science Center

PCMSC Seminar Series

April 11th, 2018, 12:00pm

Valerie Sahakian

USGS Earthquake Science Center

What's in the leftovers? Path and site effects in ground-motion prediction equations, and their residuals

Photographs from the speaker's upcoming lecture.

Abstract:
Large uncertainties in ground-motion estimation can be problematic for seismic hazard assessment, particularly critical facilities. Traditionally, ground-motion prediction equations are the main method of estimating ground motion for PSHA, and reducing uncertainty in them has been based on empirical observations of ground-motion alone. This is often problematic in regions which are not that seismically active, and therefore do not allow for such empirical methods.  Another approach is including information about physical properties or processes in a region into ground-motion models, to use knowable, repeatable (and obtainable) parameters in models of ground-motion. I will present some work investigating ways to include crustal velocity or attenuation parameters or processes in ground-motion models for path-specific ground-motion estimation. To do this, I look at the relationships between GMPE residuals, and available crustal models, focusing on the Southern California region. Finally, I will show some observations of ground-motion residuals from the recent September 2017 earthquakes in Mexico, and discuss what information can be gleaned from them regarding regional properties, and GMPEs.


April 25th, 2018, 2:00pm

Ben Brooks


May 2nd, 2018, 2:00pm

Tina Dura


May 9th, 2018, 12:00pm

Oliver Fringer


Directions and Parking

Street map of our location.
[Larger version]

From the San Francisco Bay Area:
Take your favorite highway to Hwy 17 South to Hwy 1
At the Hwys 17+1 merge, keep right
Follow signs to “Hwy 1 North, Half Moon Bay, UC Santa Cruz”
Stay on Hwy 1 North (keep in right-most lanes)
Hwy 1 is also named Mission Street — Follow Mission for about 2 miles
At the Western Drive stop light, turn left onto Western Drive
The building right in front of you is the
USGS Pacific Coastal and Marine Science Center
2885 Mission Street

From the south coast or from Hwy 17:
Take Hwy 1 North to west Santa Cruz
At the Western Drive stop light, turn left onto Western
The building right in front of you is the
USGS Pacific Coastal and Marine Science Center
2885 Mission Street

From the north coast:
Take Hwy 1 South to west Santa Cruz
At the Western Drive stop light, turn right onto Western
The building right in front of you is the
USGS Pacific Coastal and Marine Science Center
2885 Mission Street

Parking:
Limited parking spaces may be available in the parking lot located on the NE corner of Western Drive and Mission Street
Limited parking is available along Mission Street and along Natural Bridges Drive
Entrance to PCMSC is at 2885 Mission Street

See a LIST of all Seminars previously presented.

How to find our Seminar Room:

Schematic shows how to get to the PCMSC seminar room.

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URL: https://walrus.wr.usgs.gov/seminar/
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