IRIS台网地震仪资料出现2010年1月12日海地大地震“震前扰动现象”
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摘要
2010年1月12日,加勒比岛国海地爆发了Mw7.0级大地震.震中附近的宽带地震仪记录在1月10 1月12日观测到了显著的"震前扰动"现象.扰动信号的周期为3～10秒.北美大陆的宽带地震仪也记录到了类似的扰动信号.海地大地震"震前扰动"发生期间,加勒比海域及周围海域没有发生任何海洋风暴.海地大地震的"震前扰动"是由某种非台风因素引发的.
On Jan.12, 2010 the Mw 7.0 earthquake struck the Caribbean island country of Haiti.We found that significant fore-seismic tremor signals were observed during Jan.10～12 by broadband seismometers near the epicenter and these far away in the North American continent.The periods the signals are mainly in the band of 3～10 s. January is not Atlantic hurricane season and no strong tropical storms were found on the Caribbean Sea, the Gulf of Mexico and the Atlantic in Jan.10～12, which means the tremor is a microseism not induced by storms.
On Jan.12, 2010 the Mw 7.0 earthquake struck the Caribbean island country of Haiti.We found that significant fore-seismic tremor signals were observed during Jan.10～12 by broadband seismometers near the epicenter and these far away in the North American continent.The periods the signals are mainly in the band of 3～10 s. January is not Atlantic hurricane season and no strong tropical storms were found on the Caribbean Sea, the Gulf of Mexico and the Atlantic in Jan.10～12, which means the tremor is a microseism not induced by storms.
引文
[1] Magnitude7． 0-Haiti region,http://earthquake.usgs.gov/earthquakes/recenteqsww/Quakes/us2010rja6． php details.
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[8] 胡小刚,郝晓光.台风Rammasun和台风LingLing对汶川大地震和昆仑山大地震“震前扰动”影响的分析[J].地球物理学报2009,52(5) :1363～1375． Hu X G,HaoX G.The analysis of the influences of typhoon Rammasun and LingLing on anomaly tremors before the great Wenchuan and Kunlunshan earthquakes[J].Chinese J.Geophys(in Chinese),2009,52(5) :1363～1375．
[9] 胡小刚,郝晓光.2009年3月19日Mw7． 6级汤加大地震的“震前扰动”现象[J].地球物理学进展2009,24(3) :866～870． Hu X G,HaoX G.Observation of fore-seismic disturbance of the 2009/03/19 Tonga earthquake[J].Progress in Geophysics(in Chinese),2009,24(3) :866～870．
[2] Longuet-Higgins M S,A theory of origin of microseisms[J]. Philos.Trans.R.Soc.London,Ser.A,1950,243:1～35．
[3] Hasselmann K A,A stratistical analysis of the generation of microseisms.Rev.Geophys.,1963(1) ,177～209．
[4] Tanimoto T,Excitation of normal modes by nonlinear interaction of ocean waves[J].Geophys.J.Int.,2007,168: 571～582．
[5] Tanimoto T,Excitation of microseisms[J].Geophys.Res. Lett.,2007,34:L05308,doi:10． 1029/2006 GL029046．
[6] 郝晓光.胡小刚,许厚泽,等.汶川大地震前的重力扰动[J].大 地测量与地球动力学,2008,28(3) :129～131． Hao X G,Hu XG,Xu H Z,et al.Gravity disturbance before the Wenchuan Ms8． 0 earthquake[J].Journal of Geodesy and Geodynamics(in Chinese),2008,28(3) :129～131．
[7] 郝晓光,胡小刚.宽带地震仪资料证实汶川大地震“震前重力扰动”[J].地球物理学进展,2008,23(4) :1332～1335． Hao X G,Hu X G.Disturbance before the Wenchuan earthquake by broadband seismometer[J].Progress in Geophysics(in Chinese),2008,23(4) :1332～1335．
[8] 胡小刚,郝晓光.台风Rammasun和台风LingLing对汶川大地震和昆仑山大地震“震前扰动”影响的分析[J].地球物理学报2009,52(5) :1363～1375． Hu X G,HaoX G.The analysis of the influences of typhoon Rammasun and LingLing on anomaly tremors before the great Wenchuan and Kunlunshan earthquakes[J].Chinese J.Geophys(in Chinese),2009,52(5) :1363～1375．
[9] 胡小刚,郝晓光.2009年3月19日Mw7． 6级汤加大地震的“震前扰动”现象[J].地球物理学进展2009,24(3) :866～870． Hu X G,HaoX G.Observation of fore-seismic disturbance of the 2009/03/19 Tonga earthquake[J].Progress in Geophysics(in Chinese),2009,24(3) :866～870．
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