HR: 1340h
AN: S33A-1085    [Abstracts]
TI: Illumination Assessment for the Seismic-Array, Applications to the USArray Project
AU: * Xie, X
EM: xie@es.ucsc.edu
AF: IGPP, University of California, Santa Cruz, CA 95064 United States
AU: Wu, R
EM: wrs@es.ucsc.edu
AF: IGPP, University of California, Santa Cruz, CA 95064 United States
AU: Lay, T
EM: thorne@es.ucsc.edu
AF: IGPP, University of California, Santa Cruz, CA 95064 United States
AB: The deployment of Earthscope USArray Project, including both its transportable and flexible components, will greatly expand the opportunity for obtaining the properties of the Earth's interior. However, its system detecting ability is highly dependent on the factors including seismic sources used to illuminate the subsurface, the geometry of the array and the subsurface structures. To optimize the capability of the USArray, directional illumination analysis based on the wave propagation in the known velocity model is a solution. In this research, we developed a quantitative method which can assess the illumination of a specific acquisition system to the targeted subsurface structures. The method is originally built and applied in the exploration seismology where the sources and receivers are usually on the surface and the data are regularly and densely sampled. The illumination study (the acquisition system response) for the USArray project is much more complicated. Several modifications have been taken into consideration. The current method can easily calculate illuminations for different array configurations. The acquisition geometries which can be handled are highly flexible. Both active and passive sources including local and teleseismic sources can be included into calculation. The source can illuminate the target from above, below or from inside the model. The best illumination can be estimated by testing different configurations. The results can be used to assist the design of the flex array, the quality control of data acquisition, or to correct the imaging/inversion results. To demonstrate the method, we calculated the illumination for different array configurations under different sources and velocity models.
DE: 7260 Theory and modeling
DE: 7294 Instruments and techniques
DE: 7203 Body wave propagation
DE: 7218 Lithosphere and upper mantle
DE: 3260 Inverse theory
SC: Seismology [S]
MN: 2004 AGU Fall Meeting