Thread: SSA meeting special session: Estimating Earthquake Hazard from Geodetic Data

Started: 2016-12-26 16:37:20
Last activity: 2016-12-26 16:37:20
Topics: SSA Meetings
Hello All,

We will be holding a special session entitled "Estimating Earthquake Hazard
from Geodetic Data" at the SSA Annual Meeting to be held April 18 - 20,
2017 in Denver, CO. The full session description is below. Please
consider submitting an abstract; the deadline is January 11th, 2017.

Best Regards,
Jeff Freymueller
Eileen Evans
Jessica Murray
Geodetic techniques such as GPS and InSAR provide a critical constraint for
quantifying earthquake hazard by recording the active accumulation of
tectonic strain across seismogenic faults. Geodetic observations are
particularly important in regions with sparsely mapped faults and/or few
geologic slip rate estimates, such as inland Alaska, and in regions with
known seismic hazard but broadly distributed strain, like the Basin and
Range. However, geodetic estimates of fault slip rates can vary
significantly for a single fault or region and may differ from geologic
rates on the same fault. These discrepancies may reflect model assumptions
since geodetic observations of the interseismic phase of the earthquake
cycle must be interpreted in the context of a prescribed deformation model.
They may also reflect transient processes due to post-seismic relaxation,
glacial isostatic adjustment, and aseismic slip events that bias inferred
interseismic deformation rates and, in turn, long-term fault slip rate
estimates. We invite contributions that describe the application of
geodetic data to earthquake hazard estimation in a variety of settings
worldwide. We also seek contributions that present new approaches to
addressing the challenge of effectively incorporating geodetic information
into seismic hazard assessment. Some questions of interest include:

- How can we best utilize geodetic observations in regions with few mapped
structures or regions with low strain rates but known seismic hazard?

- What is the role of off-fault deformation in geodetically observed strain
rates, and what fraction of deformation occurs between major faults?

- Can we identify the cause of discrepancies between geodetic and geologic
slip rate estimates for the same fault?

- By what metrics should geodetic models be assessed?

- How do we assess uncertainty and the impact of modeling assumptions?

- How do we estimate long-term fault slip rates in the presence of
transient deformation signals (e.g., glacial isostatic adjustment,
postseismic relaxation, slow slip events, etc.)?

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~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~

Jessica Murray

Research Geophysicist
US Geological Survey
345 Middlefield Rd., MS 977
Menlo Park, CA 94025
650-329-4864
Fax: 650-329-5163
jrmurray<at>usgs.gov

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