HR: 1330h
AN: S12A-0370    [PDF]
TI: Ionospheric Remote Sensing of the Denali Earthquake Rayleigh Surface Waves
AU: * Ducic, V
EM: ducic@ipgp.jussieu.fr
AF: Institut de Physique du Globe de Paris, Departement de Geophysique Spatiale et Planetaire, 4, Avenue de Neptune, Saint Maur, 94107 France
AU: Artru, J
EM: juliette@gps.caltech.edu
AF: California Institute of Technology, Seismological Laboratory, MC 252-21, 1200 E California Blvd, Pasadena, CA 91125 United States
AU: Murakami, M
EM: +81-298-64-2655
AF: Geography and Geodynamics Research Center, Geographical Survey Institute, 1-Kitasato, Tsukuba, Ibaraki, 305-0811 Japan
AU: Lognonne, P
EM: lognonne@ipgp.jussieu.fr
AF: Institut de Physique du Globe de Paris, Departement de Geophysique Spatiale et Planetaire, 4, Avenue de Neptune, Saint Maur, 94107 France
AB: Using the Global Positioning System, we detected ionospheric disturbances associated to the long-period Rayleigh waves of the 2002 Denali earthquake (Ms = 7.9). This is the ionospheric signature of the acoustic wave produced by the surface seismic vertical displacement. The dense California GPS networks allowed us to characterize the propagation properties of the wave and to determine a group velocity map with a high spatial resolution above the Western Unite States and Pacific coasts. This work demonstrates that bi-static remote sensing measurements of seismic waves with space/ground GPS Networks can be performed. Possibly, monostatic measurements with a dedicated satellite can be envisaged for the recording in the ionosphere of surface waves for large earthquakes. Such a space remote sensing of the local group velocity of Rayleigh surface waves might complement the seismic Networks effectively for high resolution global tomography of the earth's lithosphere.
DE: 1223 Ocean/Earth/atmosphere interactions (3339)
DE: 2435 Ionospheric disturbances
DE: 3360 Remote sensing
DE: 6982 Tomography and imaging
DE: 7255 Surface waves and free oscillations
SC: Seismology [S]
MN: 2003 Fall Meeting