GPS detection of ionospheric perturbations following the January 17, 1994, northridge earthquake

Details GPS detection of ionospheric perturbations following the January 17, 1994, northridge earthquake GPS detection of ionospheric perturbations following the January 17, 1994, northridge earthquake

May 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995georl..22.1045c&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 22, no. 9, p. 1045-1048

Computer Science

Sound

74

California, Earthquakes, Global Positioning System, Ionospheric Electron Density, Seismic Waves, Gravity Waves, Infrasonic Frequencies, Ionospheric Propagation, Signal Transmission, Sound Waves

Scientific paper

Sources such as atmospheric or buried explosions and shallow earthquakes producing strong vertical ground displacements produce pressure waves that propagate at infrasonic speeds in the atmosphere. At ionospheric altitudes low frequency acoustic waves are coupled to ionispheric gravity waves and induce variations in the ionoispheric electron density. Global Positioning System (GPS) data recorded in Southern California were used to compute ionospheric electron content time series for several days preceding and following the January 17, 1994, M(sub w) = 6.7 Northridge earthquake. An anomalous signal beginning several minutes after the earthquake with time delays that increase with distance from the epicenter was observed. The signal frequency and phase velocity are consistent with results from numerical models of atmospheric-ionospheric acoustic-gravity waves excited by seismic sources as well as previous electromagnetic sounding results. It is believed that these perturbations are caused by the ionospheric response to the strong ground displacement associated with the Northridge earthquake.

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