宽带地震仪资料证实汶川大地震“震前重力扰动”
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摘要
在武汉大地测量国家野外科学观测站LacosteET重力仪资料中发现汶川大地震"震前扰动"现象之后,又在全国数十个台站宽带地震仪资料中发现了汶川大地震的"震前扰动".和LacosteET重力仪观测到的"震前扰动"一样,宽带地震仪资料的"震前扰动"也是在震前两天开始并逐渐增大,一直持续到汶川大地震发生,信号周期也是4~8 s.
After significant gravity disturbance before the 12 May 2008 Wenchuan earthquake(Ms=8.0) was observedat the Wuhan national field scientific observational station for geodesy by using LacosteET gravimeter,we discover the similar disturbances from broadband seismometers dataof several tens station across the coantry.Like the LacosteET gravimeter,the broadband seismometer shows that the disturbance has been gradually increasing two days before the earthquake with its period of 4~8 s.
After significant gravity disturbance before the 12 May 2008 Wenchuan earthquake(Ms=8.0) was observedat the Wuhan national field scientific observational station for geodesy by using LacosteET gravimeter,we discover the similar disturbances from broadband seismometers dataof several tens station across the coantry.Like the LacosteET gravimeter,the broadband seismometer shows that the disturbance has been gradually increasing two days before the earthquake with its period of 4~8 s.
引文
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[3]郝晓光.L&R-ET重力仪在南极中山站记录到“不明地学事件”[J].极地研究,1997,9(3):214~215.Hao X G.An unidentified geophysical event recorded withL&R-ET gravity meter at Zhongshan Station Antarctica[J].Chinese J.of Polar Science,1997,8(2):146~147.
[4]朱传镇,房明山,安镇文.脉动与地震关系初步探讨[J].地球物理学报,1977,20(1):20~32.Zhu C Z,Fang M S,An Z W.Preliminary discuss on relation-ship between disturbance and earthquake[J].Chinese Journalof Geophysics,1977,20(1):20~32.
[5]韩元杰.预滑与地震——长周期波动研究[J].西北地震学报,1984,6(1):10~15.Han Y J.Study on pre-slip precursor of the earthquake-longperiod precursory seismic wave[J].Northwestern Seismologi-cal Journal,1984,6(1):10~15.
[6]冯德益,潘琴龙,郑斯华,等.长周期形变波及其所反应的短期和临震地震前兆[J].地震学报,1984,6(1):41~56.Feng D Y,Pan Q L,Zheng S H,et al.Long-period deforma-tional waves and short-term and imminent earthquake precur-sors[J].Acta Seismologica Sinica,1984,6(1):41~56.
[7]陈德福,罗荣祥,刘国培.倾斜异常图像分类及其特征浅析[J].地震学报,1986,8(2):211~225.Chen D F,Luo R X,Liu G P.Preliminary opinion on the fea-tures and classification of anomaly patterns of crustal tilt[J].Acta Seismologica Sinica,1986,8(2):211~225.
[8]姚同福,付印发,侯康明,等.1976年松潘7.2级地震前几种异常波形的记录特征及其在大震短临预报中的应用[J].西北地震学报,1994,16(2):57~61.Yao T F,Fu Y F,Hou K M,et al.Waveform anomaly priorto the Songpan earthquake and its value to short-imminent pre-diction of strong earthquakes[J].Northwestern SeismologicalJournal,1994,16(2):57~61.
[9]张晓东,马文静.1994年2月16日共和5.8级地震短临预报实况[J].地震,1995,(1):20~28.Zhang X D,Ma W J.The short-term and impending earth-quake prediction for Gonghe earthquake withMs5.8 on feb 161994[J].Earthquake,1995,(1):20~28.
[10]Dziewonski A M,Gilbert F.Temporal variation of the seis-mic moment tensor and evidence of precursive compression fortwo deep earthquakes[J].Nature,1974,247:185~188.
[11]Kanamori J,Cipar J J.Focal process of the great chileanearthquake May 22,1960[J].Phys.Earth.Planet.Inter,1974,9:128~136.
[12]Kerr R.Quake prediction by seismic oxymora[J].Science,1990,248:1490.
[13]Ihmle P F,Harabaglia P,Jordan T H.Teleseismic detectionof slow precursors of the great 1989 macquarie ridge earth-quake[J].Science,1994,261:177~183.
[14]Ihmle P F,Jordan T H.Teleseismic search for slow precur-sors to large earthquake[J].Science,1994,266:1547~1551.
[15]Monastersky R.Before the quake:detecting the slow groan[J].Science News,1994,146(23):374.
[16]McGuire J J,Ihmle P F.Time-domain observations of a slowprecursor to the 1994 roman the transform earthquake[J].Science,1996,273:82~85.
[17]Kerr R.Seismology:A slow start for earthquakes[J].Sci-ence,1998,279:985.
[18]Kizawa T.大地震前后重力仪的记录[J].国外地震,1972(1):39~41.Kizawa T.Recording of gravimeter around strong earthquake[J].Oversea Earthquakes,1972(1):39~41.
[19]Kanamori H,Cipar J J.Focal process of the great chileanearthquake May 22,1960[J].Physics of the Earth and Plan-etary Interiors,1974,9:128~136.
[20]吴忠良,蒋长胜.近期国际地震预测预报研究进展的几个侧面[J].中国地震,2005,21(1):103~112.Wu Z L,Jiang C S.From“earthquakes cannot be predicted”to“a seismic shift in thinking”:a review of some developingaspects in earthquake forecasting and prediction study[J].Earthquake Research in China,2005,21(1):103~112.
[21]Geller R J,Jackson D D,Kagan Y Y,et al.Earthquakes can-not be predicted[J].Science,1997,275:1616~1617.
[22]Cyranoski D.A seismic shift in thinking[J].Nature,2004,431,1032~1034.
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