汶川地震前羊八井中子-μ子望远镜计数率异常
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摘要
利用在西藏羊八井新建中子-μ子望远镜的观测数据,研究分析了在2008年5月12日四川汶川8.0地震期间宇宙线高能粒子偏离正常背景的异常变化。中子-μ子望远镜的中子监测器经过消除背景场和气压修正后震前5天特别是5月9日出现计数率降低异常。在地震发生前5天左右,μ子望远镜各方向计数率出现日变化异常。这些宇宙线异常现象,与其它观测资料,例如地磁低点位移、电离层总电子含量TEC、电离层测高仪得到的foF2和电磁卫星监测的离子密度和温度等,在时空分布上有较好的一致性。这是继羊八井中子监测器观测到震前宇宙线异常现象后,利用另一种宇宙线观测手段观测到的震前宇宙线异常现象。
Using the data obtained with a newly-built Yangbajing neutron-muon telescope in Tibet,the abnormal changes of high energy cosmic ray particles deviating from the normal background are studied.The neutron monitor count rates,after the elimination of the background field and the pressure correction,appear to be reduced abnormally 5 days before the earthquake,especially in May 9.About 5 days before earthquake,the muon telescope count rates have an abnormal diurnal variation in each direction.These cosmic ray abnormities,and other observations,such as the geomagnetic low-point displacement,total electron concentration(TEC),foF2 obtained by ionosphere sounding and ion density and temperature detected by electromagnetic satellite,are consistency in space and time.Following the Yangbajing neutron monitor,the Yangbajing neutron-muon telescope also observed the anomalies in cosmic rays before the earthquake.
Using the data obtained with a newly-built Yangbajing neutron-muon telescope in Tibet,the abnormal changes of high energy cosmic ray particles deviating from the normal background are studied.The neutron monitor count rates,after the elimination of the background field and the pressure correction,appear to be reduced abnormally 5 days before the earthquake,especially in May 9.About 5 days before earthquake,the muon telescope count rates have an abnormal diurnal variation in each direction.These cosmic ray abnormities,and other observations,such as the geomagnetic low-point displacement,total electron concentration(TEC),foF2 obtained by ionosphere sounding and ion density and temperature detected by electromagnetic satellite,are consistency in space and time.Following the Yangbajing neutron monitor,the Yangbajing neutron-muon telescope also observed the anomalies in cosmic rays before the earthquake.
引文
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[2]BENCK S,CYAMUKUNGU M,CABRERA J.Stud-y of correlations between waves and particle fluxesmeasured on board the DEMETER satellite[J].Ad-vances in Space Research.2008,42(9):1538-1549.
[3]张吉龙,谭有恒,卢红.羊八井中子监测设备及其在多学科交叉研究中的应用前景[C]//基于羊八井平台的交叉学科研究论文集.拉萨,2004:71-78.ZHANG Jilong,TAN Youheng,LU Hong.Yangba-jing neutron monitor equipment and application pros-pects on the interdisciplinary research[C]//The Firstworkshop on interdisciplinary research at YBJ.Lhasa,2004:71-78.
[4]张吉龙,丁鉴海,申旭辉,等.强震前中子监测器计数率异常现象探索[J].电波科学学报,2010,25(1):31-36.ZHANG jilong,DING Jianhai,SHEN Xuhui,et al.Neutron monitor count rate anomaly before strongearthquake[J].Chinese Journal of Radio Science,2010,25(1):31-36.(in Chinese)
[5]赵根模,杨港生,陈化然.寂静的前震与地震预测[J].地震,2001,21(1):69-77.ZHAO Genmo,YANG Gangsheng,CHEN Huaran.Quiescent foreshock and earthquake prediction[J].Earthquake,2001,21(1):69-77.(in Chinese)
[6]Zhang J L,et al.Proc.Of the 29th ICRC,Pune,2005,SH 1.1
[7]MURAKI Y,TSUCHIYA H,FUJIKI K,et al.Asolar neutron telescope in Tibet and its capability ex-amined by the 1998 November 28th event[J].Astrop-article Physics,2007,28(1):119-131.
[8]张吉龙,鲍克智,丁林垲,等.用羊八井太阳宇宙线探测装置对太阳耀斑中子的初步探测[J].高能物理与核物理,2000,24(12):1081-1087.ZHANG Jilong,BAO Kezi,DING Linki,et al.A ob-servation of solar flare neutrons using Yangbajing solarcosmic ray detect detector[J].High energy physicsand nuclear physics,2000,24(12):1081-1087.(inChinese)
[9]余杰,李铁辉,王辉,等.羊八井Muon望远镜中基于FPGA的方向测量电路[J].核电子学与探测技术,2009,29(2):390-401.YU Jie,LI Tiehue,WANG Hui,et al.The directionmeasurement circuit based on FPGA for YangbajingMuon telescope[J].Nuclear Electronics&DetectionTechnology,2009,29(2):390-401.(in Chinese)
[10]聂思敏,张吉龙,卢红,等.基于IE的羊八井中子监测器数据实时发布系统[J].地震,2007,27(4):91-98.NIE Simin,ZHANG Jilong,LU Hong,et al.Quickview images system of Yangbajing neutron monitorbased on IE[J].Earthquake,2007,27(4):91-98.(in Chinese)
[11]唐云秋,卢红,乐贵明,等.羊八井宇宙线强度观测数据的气压修正[J].空间科学学报,2004,24(3):221-225.TANG Yueqiou,LU Hong,YUE Guimin,et al.The pressure correction of the cosmic ray data inYangbajing[J].Chinese Journal of Space science,2004,24(3):221-225.(in Chinese)
[12]丁鉴海,余素荣,王亚丽.地磁低点位移现象与强震预测研究[J].电波科学学报,2008,23(6):1011-1017.DING Jianhai,YU Surong,WANG Yali.Geomag-netic low-point displacement phenomena and strongearthquake prediction resesrch[J].Chinese Journal ofRadio Science,2008,23(6):1011-1017.(in Chi-nese)
[13]WANG Wuxing,DING Jianhai,YU Surong,et al.Short-term and imminent geomagnetic anomalies ofthe Wenchuan Ms8.0 earthquake and exploration ofearthquake prediction[J].Earthq Sci,2009,22(2):135-141.
[14]张学民,丁鉴海,申旭辉,等.汶川8级地震前电磁扰动与电磁立体监测体系[J].电波科学学报,2009,24(1):1-8.ZHANG Xuemin,DING Jianhai,SHEN Xuhui,etal.Electromagnetic perturbations before WenchuanM8 earthquake and stereo electromagnetic observationsystem[J].Chinese Journal of Radio Science,2009,24(1):1-8.(in Chinese)
[15]丁鉴海,申旭辉,潘威炎,等.地震电磁前兆研究进展[J].电波科学学报,2006,21(5):791-801.DING Jianhai,SHEN Xuhui,PAN Weiyan,et al.Seismo-electromagnetism precursor research progress[J].Chinese Journal of Radio Science,2006,21(5):791-801.(in Chinese)
[16]胡小刚,郝晓光.强台风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 Xiaogang,HAO Xiaoguang.An analysis of theinfluences of typhoon on anomalous tremors beforethe great Wenchuan and Kunlunshan earthquakes[J].Chinese J.Geophys.,2009,52(5):1363-1357.(inChinese)
[17]HIM A,LAIGLE M.Silent heralds of megathrustearthquakes[J].Science,2004,305(24):1917-1918.
[18]多尔曼.宇宙线天体物理学实验和理论基础[M].北京:科学出版社,1987.
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