HR: 09:00h
AN: G41A-05    [Abstracts]
TI: Multi-spatial and temporal scale deformation of Japan from GEONET data
AU: * Owen, S E
EM: Susan.E.Owen@jpl.nasa.gov
AF: Jet Propulsion Laboratory, 4800 Oak Grove Drive, Pasadena, CA 91109, United States
AU: Dong, D
EM: Danan.Dong@jpl.nasa.gov
AF: Jet Propulsion Laboratory, 4800 Oak Grove Drive, Pasadena, CA 91109, United States
AU: Lohman, R B
EM: Rowena.B.Lohman@jpl.nasa.gov
AF: Jet Propulsion Laboratory, 4800 Oak Grove Drive, Pasadena, CA 91109, United States
AU: Liu, Z
EM: Zhen.Liu@jpl.nasa.gov
AF: Jet Propulsion Laboratory, 4800 Oak Grove Drive, Pasadena, CA 91109, United States
AU: Hetland, E
EM: eah@gps.caltech.edu
AF: Geological and Planetary Sciences Department, California Institute of Technology, 1200 E. California Blvd, Pasadena, CA 91125, United States
AU: Muse, P
EM: muse@gps.caltech.edu
AF: Geological and Planetary Sciences Department, California Institute of Technology, 1200 E. California Blvd, Pasadena, CA 91125, United States
AU: Lundgren, P
EM: Paul.R.Lundgren@jpl.nasa.gov
AF: Jet Propulsion Laboratory, 4800 Oak Grove Drive, Pasadena, CA 91109, United States
AU: Webb, F
EM: fhw@jpl.nasa.gov
AF: Jet Propulsion Laboratory, 4800 Oak Grove Drive, Pasadena, CA 91109, United States
AU: Simons, M
EM: simons@caltech.edu
AF: Geological and Planetary Sciences Department, California Institute of Technology, 1200 E. California Blvd, Pasadena, CA 91125, United States
AB: The Japan subduction zone represents a complex set of plate interfaces with significant trench-parallel variability in great earthquakes and transient deep slip events. Through analysis of the GEONET GPS data, the spatial and higher frequency temporal characteristics of plate coupling and transient slip events can be captured. We describe our analysis methods, the resultant velocities and time series, as well as progress to date on models of interseismic, transient and coseismic deformation. To quickly and routinely analyze the large volume of GPS data from GEONET, we have developed the GPS Network Processor (GNP). The GNP is based on the JPL- developed GIPSY-OASIS GPS analysis software. The GNP efficiently implements precise point positioning and bias fixing on a 1000 node cluster. We are currently working on using the GEONET time series to determine the degree and spatial extent of plate coupling along the subducting plates. We will be using strain maps and the Network Inversion Filter [Segall and Matthews, JGR, Vol. 102, 22391-22409, 1997] to look at transient deformation at different spatial and temporal scales. In addition, we have developed fault plane parameterizations that adapt the spatial complexity of the coseismic slip model to the distribution and signal to noise ratio of the data. This coseismic slip modeling will be applied to the 2003 Tokachi-Oki M8.1 earthquake. The Japanese subduction zones provide an excellent natural laboratory for studying transient motion and fault mechanics. By applying state- of-the art analysis and modeling techniques to the GEONET data, we get improved estimates of interseismic velocities, transient deformation, plate coupling, and coseismic slip, all of which are crucial for understanding subduction zone fault properties.
DE: 1240 Satellite geodesy: results (6929, 7215, 7230, 7240)
DE: 1242 Seismic cycle related deformations (6924, 7209, 7223, 7230)
DE: 8118 Dynamics and mechanics of faulting (8004)
DE: 9320 Asia
SC: Geodesy [G]
MN: 2007 Joint Assembly