广州地区低纬电离层TEC扰动与两次强地震的关系研究
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摘要
利用广州地区GPS-TEC监测网获得的TEC数据,分析了两次7.0级以上地震与低纬电离层TEC扰动存在的可能联系。对TEC的时序分析表明:两次地震发生前TEC的日变幅度均出现下降。但两次地震异常之间存在一定差异。台湾南部邻海7.2级地震前10 d内出现了负异常和正异常,但汶川8.0级地震前8 d和后6d内只出现负异常。此外,还讨论了低层电离层TEC扰动与地磁活动及热层动力学之间可能存在的联系。
This paper investigated the possible relation of the TEC perturbations of low-latitude ionosphere and two M7.0 earthquakes,by using total electron content(TEC) data monitored from the Guangzhou GPS-TEC network. The analysis of time series of TEC showed that the daily ranges of TEC decreased before both earthquakes. But there were a few differences in anomalies between the two earthquakes. There were negative as well as positive anomalies within 10 days before the M7.2 southern Taiwan offshore earthquake,but there were only negative anomalies within 8 days before and 6 days after the M8.0 Wenchuan earthquake. The paper alsodiscussed the causes of the perturbations,and possible associations with geomagnetic activity and thermospheric dynamics.
This paper investigated the possible relation of the TEC perturbations of low-latitude ionosphere and two M7.0 earthquakes,by using total electron content(TEC) data monitored from the Guangzhou GPS-TEC network. The analysis of time series of TEC showed that the daily ranges of TEC decreased before both earthquakes. But there were a few differences in anomalies between the two earthquakes. There were negative as well as positive anomalies within 10 days before the M7.2 southern Taiwan offshore earthquake,but there were only negative anomalies within 8 days before and 6 days after the M8.0 Wenchuan earthquake. The paper alsodiscussed the causes of the perturbations,and possible associations with geomagnetic activity and thermospheric dynamics.
引文
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[29]Calais,E.,Minster,J.B.GPS detection of ionospheric TEC perturbations following the January 17,1994,Northridge Earthquake[J].Geophysical Research Letters.1995,22(9):1040-1048.
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[31]Pulinets,S.A.,Ouzounov,D.,Ciraolo,L.,etal.Thermal,atmospheric and ionospheric anomalies around the time of the Colima M7.8 earthquake of 21 January 2003[J].Annales Geophysicae,2006,24:835-849.
[2]Liu,J.Y.,Chen,Y.I.,Pulinets,S.A.,etal.Seismoionospheric signatures prior to M6.0 Taiwan earthquakes[J].Geophysical Research Letters,2000,27(19):3113-3116.
[3]Liu,J.Y.,Chen,Y.I.,Chuo,Y.J.,etal.Variations of ionospheric total electron content during the Chi-Chi earthquake[J].Geophysical Research Letters,2001,28(7):1383-1386.
[4]Shvets,A.V.,Hayakawa,M.,Maekawa,S.Results of subionospheric radio LF monitoring prior to the Tokachi(m=8,Hokkaido,25 September 2003)earthquake[J].Nat.Hazards Earth Syst.Sci.,2004,4:647-653.
[5]Hayakawa,M.,Ohta,K.,Nickolaenko,A.P.,etal.Anomalous effect in Schumann resonance phenomena observed in Japan,possibly associated with the Chi-chi earthquake in Taiwan[J].Ann.Geophys.,2005,23:1335-1346.
[6]Alina,M.H.,Mohammed,A.M.,Mohd,A.M.A.,etal.Ionospheric and geomagnetic disturbances during the 2005Sumatran earthquakes[J].Journal of Atmospheric and Solar-Terrestrial Physics,2009,71(17-18):1992-2005.
[7]Zhou,Y.,Wu,Y.,Qiao,X.,etal.Ionosphericanomalies detected by ground-based before the Mw7.9Wenchuanearthquake of May 12,2008,China[J].Journal of Atmospheric and Solar-Terrestrial physics,2009,71(8-9):959-966.
[8]Xia,C.,Wang,Q.,Yu,T.,etal.Variations of ionospheric total electron content before threestrong earthquakes in the Qinghai-Tibet region[J].Advances in Space Research,2011(47):506-514.
[9]Pulinets,S.A.,Khegai,V.V.,Boyarchuk,K.A.,etal.Atmospheric electric field as a source of ionospheric variability[J].Physics-Uspekhi,1998,41(5):515-522.
[10]Pulinets,S.A.,Liu,J.Y.Ionospheric variability unrelated to solar and geomagnetic activity[J].Advances in Space Research,2004(34):1926-1933.
[11]Ondoh,T.Seismo-ionospheric Phenomena[J].Advances in space Research,2000,26(8):267-1272.
[12]Molchanov,O.A.,Hayakawa,M.,Miyaki,K.VLF/LF sounding of the lower ionosphere to study the role of atmospheric oscillations in the lithosphere-ionosphere coupling[J].Adv.Polar Upper Atmos.Res.,2001,15:146-158.
[13]Pulinets,S.A.,Legen'ka,A.D.,Gaivoronskaya,T.V.,etal.Main phenomenological features of ionospheric precursors of strong earthquakes[J].Terra Science Publishing Co.,Tokyo,2003,65(16-18):1337-1347.
[14]Liu,J.Y.,Chen,C.H.,Chen,Y.I.,etal.A statistical study of ionospheric earthquake precursors monitored by using equatorial ionization anomaly of GPS TEC in Taiwan during 2001-2007[J].Journal of Asian Earth Sciences,2010,39(1-2):76-80.
[15]Appleton,E.V.Two anomalies in the ionosphere[J].Nature,1946,157:691-693.
[16]Zakharenkova,I.E.,Krankowski,A.,Shagimuratov,I.I.Modification of the low-latitude ionosphere before December 26,2004 Indonesian earthquake[J].Natural Hazards and Earth System Sciences,2006,6(5):817-823.
[17]Zakharenkova,I.E.,Shagimuratov,I.I.,Tepenitzina,etal,A.Anomalous modification of the ionospheric total electron content prior to the 26 September 2005 Peru earthquake[J].Journal of Atmospheric and Solar-Terrestrial physics,2008,70(15):1919-1928.
[18]Pulinets,S.A.,Leyva Contreras,A.,Bisiacchi-Giraldi,G.,etal.Total electron content variations in the ionosphere before the Colima,Mexico,earthquake of 21 January 2003[J].Geofisica Internacional,2005,44(4):369-377.
[19]Liu,J.Y.,Chen,Y.I.,Chuo,Y.J.,etal A statistical investigation of pre-earthquake ionospheric anomaly[J].Journal of Geophysical Research,2006,111(A5):304-308.
[20]Liu,J.Y.,Chuo,Y.J.,Shan,S.J.,etal.Preearthquake ionospheric anomalies monitored by GPS TEC[J].Annales Geophysicae,2004,22(5):1585-1593.
[21]Dobrovolsky,I.P.,Zubkov,S.I.,Miachkin,V.I.Estimation of the size of earthquake preparation zones[J].Pure and Apply Geophysics,1979,117(5):1025-1044.
[22]Rishbeth,H.Dynamics of the equatorial F-region[J].Journal of Atmospheric and Terrestrial Physics,1977,39:1159-1168.
[23]Tsai,H.F.,Liu,J.Y.,Tsai,W.H.,etal.Seasonal variations of the ionospheric total electron content in Asian equatorial anomaly regions[J].Journal of Geophysical Research,2001,106(A12):30363-30369.
[24]Abdu,M.A.Equatorial ionosphere-thermosphere system:Electrodynamics and irregularities[J].Advances in Space Research,2005,35(5):771-787.
[25]Dabas,R.S.,Singh,Lakha,Garg,Das,etal.Growth and decay of a post-sunset equatorial anomaly at low latitudes:Control of,neutral winds and daytime electrojet strength[J].Journal of Atmospheric and Solar-Terrestrial Physics,2006,68(3-5):1622-1632.
[26]Rishbeth,H.F-region links with the lower atmosphere?[J].Journal of Atmospheric and Solar-Terrestrial Physics,2006,68(3-5):469-478.
[27]Dabas,R.S.,Das,Rupesh M.,Kavita Sharma,etal.Ionospheric pre-cursors observed over low latitudes during some of the recent major earthquakes[J].Journal of Atmospheric and Solar-Terrestrial Physics,2007,69(15):1813-1824.
[28]Sorokin,V.M.,Chmyrev,V.M.,Yaschenko,A.K.Electrodynamic model of the lower atmosphere and the ionosphere coupling[J].Journal of Atmospheric and SolarTerrestrial Physics,2001,63(16):1681-1691.
[29]Calais,E.,Minster,J.B.GPS detection of ionospheric TEC perturbations following the January 17,1994,Northridge Earthquake[J].Geophysical Research Letters.1995,22(9):1040-1048.
[30]Pulinets,S.A.,Legen'ka,A.D.,Gaivoronskaya,T.V.,etal.Main phenomenological features of ionospheric precursors of strong earthquakes[J].Journal of Atmospheric and Solar-Terrestrial Physics,2003,65(16-18):1337-1347.
[31]Pulinets,S.A.,Ouzounov,D.,Ciraolo,L.,etal.Thermal,atmospheric and ionospheric anomalies around the time of the Colima M7.8 earthquake of 21 January 2003[J].Annales Geophysicae,2006,24:835-849.
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