MODIS亮温增温异常点比值的时序分析方法及其在台湾一些5级以上地震前的异常变化
|
摘要
首次提出了MODIS卫星遥感数据用于地震预测研究的MODIS亮温增温异常点比值定量化方法以及尽量减少云层干扰的初步方案。结合近期台湾地区一系列中强地震的震例研究,归纳了分析区域内中强地震前的MODIS亮温增温异常的量化指标。研究表明,大部分研究震例在地震发生前1~20天都出现了突跳性质的增温异常比值(活跃度)增强的情况,而正常情况下增温异常比值都在零值附近波动。利用在一定程度上排除了云层影响的MODIS卫星遥感热红外信息得到的亮温增温异常点比值的变化,在一些多震地区有针对性地系统开展研究,有望找到识别地震短临前兆的一种新方法。
In the study of application of MODIS satellite remote sensing data to earthquake prediction,the paper put forward for the first time a quantificational method for the ratio of the pixels with abnormal brightness temperature(BT)increasing and a preliminary scheme for cloud removal.The principle is that firstly,the cloudless data observed by the same satellite at the same period of time but in different days(usually 1 to 3 days)are mosaiched to get high cloudless rate data,and then the brightness temperature variation curve and mean variance of each pixel are calculated with the data from the covered area to determine daily whether the brightness temperature data of the day is normal or not at certain pixel by using twice of the mean variance as criterion.The ratio of the pixels with abnormal BT increasing can be calculated by dividing the total number of abnormal pixels with the total pixels of the whole area.Analysis on a series of recent earthquakes in Taiwan area shows that the ratio of pixels with abnormal BT increasing,which normally undulates around zero,had a sudden jump 1 to 20 days before the medium-strong earthquakes.It is expected that a new method for identifying earthquake auspice could be found through special studies in regions with frequent seismic activity by analyzing the change of ratio of the pixels with abnormal BT increasing from MODIS satellite remote sensing infrared information on which the effect of cloud has been removed to a certain extent.
In the study of application of MODIS satellite remote sensing data to earthquake prediction,the paper put forward for the first time a quantificational method for the ratio of the pixels with abnormal brightness temperature(BT)increasing and a preliminary scheme for cloud removal.The principle is that firstly,the cloudless data observed by the same satellite at the same period of time but in different days(usually 1 to 3 days)are mosaiched to get high cloudless rate data,and then the brightness temperature variation curve and mean variance of each pixel are calculated with the data from the covered area to determine daily whether the brightness temperature data of the day is normal or not at certain pixel by using twice of the mean variance as criterion.The ratio of the pixels with abnormal BT increasing can be calculated by dividing the total number of abnormal pixels with the total pixels of the whole area.Analysis on a series of recent earthquakes in Taiwan area shows that the ratio of pixels with abnormal BT increasing,which normally undulates around zero,had a sudden jump 1 to 20 days before the medium-strong earthquakes.It is expected that a new method for identifying earthquake auspice could be found through special studies in regions with frequent seismic activity by analyzing the change of ratio of the pixels with abnormal BT increasing from MODIS satellite remote sensing infrared information on which the effect of cloud has been removed to a certain extent.
引文
陈梅花,邓志辉,贾庆华.2003.地震前卫星红外异常与发震断裂的关系研究:以2001年昆仑山8.1级地震为例[J].地震地质,25(1):100—108.CHEN Mei-hua,DENG Zhi-hui,JIA Qing-hua.2003.The relationship between the satellite infrared anomalies beforeearthquake and the seismogenic fault:A case study on the2001Kunlun earthquake[J].Seismology and Geolo-gy,25(1):100—108(in Chinese).
刘放,程万正,张永久,等.2001.卫星遥感热红外辐射与川滇强震探讨[J].地震,21(2):65—69.LIU Fang,CHENG Wan-zheng,ZHANG Yong-jiu,et al.2001.Remote sensing observation of thermal infrared imagetaken by satellite and earthquakes(M≥6.0)[J].Earthquake,21(2):65—69(in Chinese).
马瑾,汪一鹏,陈顺云,等.2005.卫星热红外信息与断层活动关系讨论[J].自然科学进展,15(12):1467—1475.MA Jin,WANG Yi-peng,CHEN Shun-yun,et al.2005.Insight into correlation between satellite infrared informationand fault activities[J].Progress in Natural Science,16(4):394—402.
强祖基,徐秀登,赁常恭.1990.热红外异常:临震前兆[J].科学通报,35(17):1324—1327.QIANG Zu-ji,XU Xiu-deng,DIAN Chang-gong.1990.Satellite infrared thermo-anomaly:Earthquake imminent pre-cursor[J].Chinese Science Bulletin,35(17):1324—1327(in Chinese).
尹京苑,房宗绯,钱家栋,等.2000.红外遥感用于地震预测及其物理机理研究[J].中国地震,16(2):140—148.YIN Jing-yuan,FANG Zong-fei,QIAN Jia-dong,et al.2000.Research on the application of satellite infrared remotesensing in earthquake predication and its physical mechanism[J].Earthquake Research in China,16(2):140—148(in Chinese).
В.И.Горкий и др.1988.Ухоаящее инфракрасн ое изичение Зем ли-индикатор сейсмической активности[J].Док.АНСССР,301(1):67—69.
刘放,程万正,张永久,等.2001.卫星遥感热红外辐射与川滇强震探讨[J].地震,21(2):65—69.LIU Fang,CHENG Wan-zheng,ZHANG Yong-jiu,et al.2001.Remote sensing observation of thermal infrared imagetaken by satellite and earthquakes(M≥6.0)[J].Earthquake,21(2):65—69(in Chinese).
马瑾,汪一鹏,陈顺云,等.2005.卫星热红外信息与断层活动关系讨论[J].自然科学进展,15(12):1467—1475.MA Jin,WANG Yi-peng,CHEN Shun-yun,et al.2005.Insight into correlation between satellite infrared informationand fault activities[J].Progress in Natural Science,16(4):394—402.
强祖基,徐秀登,赁常恭.1990.热红外异常:临震前兆[J].科学通报,35(17):1324—1327.QIANG Zu-ji,XU Xiu-deng,DIAN Chang-gong.1990.Satellite infrared thermo-anomaly:Earthquake imminent pre-cursor[J].Chinese Science Bulletin,35(17):1324—1327(in Chinese).
尹京苑,房宗绯,钱家栋,等.2000.红外遥感用于地震预测及其物理机理研究[J].中国地震,16(2):140—148.YIN Jing-yuan,FANG Zong-fei,QIAN Jia-dong,et al.2000.Research on the application of satellite infrared remotesensing in earthquake predication and its physical mechanism[J].Earthquake Research in China,16(2):140—148(in Chinese).
В.И.Горкий и др.1988.Ухоаящее инфракрасн ое изичение Зем ли-индикатор сейсмической активности[J].Док.АНСССР,301(1):67—69.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心