Seismo-ionospheric signatures prior to M>=6.0 Taiwan earthquakes

Details Seismo-ionospheric signatures prior to M>=6.0 Taiwan earthquakes Seismo-ionospheric signatures prior to M>=6.0 Taiwan earthquakes

Oct 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000georl..27.3113l&link_type=abstract

Geophysical Research Letters, Volume 27, Issue 19, p. 3113-3116

Physics

47

Ionosphere: Ionospheric Disturbances, Seismology: Seismic Hazard Assessment And Prediction

Scientific paper

This paper examines variations of the greatest plasma frequency in the ionosphere, foF2, recorded by the Chung-Li ionosonde (25.0° N, 121.1° E) before M>=6.0 earthquakes during 1994-1999. The 15-day running median and the associated inter-quartile range are utilized as the reference and the upper or lower bounds to monitor the ionospheric foF2 variations for finding seismo-ionospheric signatures (precursors) of the earthquakes. It is found that precursors, in the form of the recorded foF2 falling below its associated lower bound around 1200-1700 LT, appear 1-6 days prior to these earthquakes. On September 20, 1999 UT (September 21, Taiwan local time) a large Mw=7.7 earthquake struck central Taiwan near the small town of Chi-Chi. We analyzed the foF2 and found three clear precursors 1, 3, and 4 days prior to the Chi-Chi earthquake.

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