Seismo-ionospheric anomalies of the GPS-TEC appear before the 12 May 2008 magnitude 8.0 Wenchuan Earthquake

In this paper, the total electron content (TEC) of Global Ionosphere Maps (GIMs) is normalized and employed to study the seismo-ionospheric anomalies at the time of the 12 May 2008 M 8.0 Wenchuan Earthquake. The space weather conditions are taken into account. It is found that remarkable reductions appear locally around the epicentre and their conjugate points during the daytime of 29 April and 6–10 May 2008. A global study and a strict criterion are applied to detect anomalies. Results show that the anomalies on 29 April and 6 and 7 May 2008, which are respectively days 13, 6 and 5 before, are possibly related to the earthquake. The conjugate signature implies the seismo-generated electric field is essential.

[1]  S. Pulinets,et al.  Ionospheric precursors of earthquakes , 2004 .

[2]  早川 正士,et al.  Seismo electromagnetics : lithosphere-atmosphere-ionosphere coupling , 2002 .

[3]  M. Parrot,et al.  On variations of fo F2 and F-spread before strong earthquakes in Japan , 2006 .

[4]  Yu-Hsiang Lin,et al.  Ionospheric foF2 and TEC Anomalous Days Associated with M ≥ ≥ 5.0 Earthquakes in Taiwan during 1997-1999 , 2004 .

[5]  Yi-Ben Tsai,et al.  Seismo‐ionospheric signatures prior to M≥6.0 Taiwan earthquakes , 2000 .

[6]  Michel Parrot,et al.  Ionospheric perturbations linked to a very powerful seismic event , 2005 .

[7]  Y. J. Chuo,et al.  A statistical investigation of preearthquake ionospheric anomaly , 2006 .

[8]  S. Pulinets,et al.  Pre-Earthquake Ionospheric Effects and their Possible Mechanisms , 1994 .

[9]  早川 正士,et al.  Electromagnetic phenomena related to earthquake prediction , 1994 .

[10]  Y. Tsai,et al.  Statistical Tests for Pre-earthquake Ionospheric Anomaly , 2004 .

[11]  Min Wang,et al.  Ionospheric total electron content variations prior to the 2008 Wenchuan Earthquake , 2010 .

[12]  Michael C. Kelley,et al.  The earth's ionosphere , 1989 .

[13]  Yi-Ben Tsai,et al.  Pre-earthquake ionospheric anomalies registered by continuous GPS TEC measurements , 2004 .

[14]  Sergey Pulinets,et al.  Seismic activity as a source of the ionospheric variability , 1998 .

[15]  J. Liu,et al.  Ionospheric electron content anomalies detected by a FORMOSAT-3/COSMIC empirical model before and after the Wenchuan Earthquake , 2010 .

[16]  早川 正士,et al.  Seismo-electromagnetics and related phenomena : history and latest results , 2008 .

[17]  Libo Liu,et al.  Is an unusual large enhancement of ionospheric electron density linked with the 2008 great Wenchuan earthquake , 2008 .