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Applications of ongoing GPS deployments for Cascadia seismic hazards assessment
Tim MelbourneCentral Washington University
Interseismic
Deformation
Four levels of GPS Data Analyses
East-West
• Northern Washington/SW BC
Nearfield deformation from April 1997 creep event
Spatial inversion of geodetic data:
( ) 22222/1 )(, xbAxx Ñ+-= --å llR
b datax slipA Green’s fnsl misfit/roughnessS data covariance
Start with the fault:The Juan de Fuca-North American plate interface
(McCrory et al., 2003)
1998.5
Slip propagation through time
March 1-15
February 1-15
February 16-28
2003-Largest event so far
Central Oregon and Northern California
Real-time GPS Data available for tsunami warning systems
New Plate Boundary Observatory GPS deployments
~150-~190 non-PBO GPS deployments
PANGA 2002
PANGA +
Surveyors
2002
Stations processed
by CWU- 2005
(plus 450 PBO)
By end of next year:
250+ cGPS instruments
Variable monumentation
Current interseismic strain:
Puget/forearc hazards
YFB N-S convergence
SSE moment budgets
Real-time data feeds-tsunami apps