甘肃及邻近地区中强地震前弱震空区的时空参数研究
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摘要
用R-T图方法研究了甘肃及邻近地区发生的19次中强地震前震源及附近地区出现空区的现象以及空区的时空参数。结果表明其中16次震前都出现了明显的空区。根据空区时空参数拟合出了空区的最大空间尺度和持续时间与主震震级的关系,为研究"区域-时间-长度"算法(RTL算法)对甘肃及邻近地区中强地震前的地震活动异常特征(平静和活跃)提供了依据。
The seismic gaps and their temporal-spatial parameters appearing around the source areas before 19 moderate-strong earthquakes in Gansu and its nearby region are studied using the R-T plots method.The result shows that 16 events among the 19 earthquakes formed seismic gaps before main shocks.The empirical formulas connecting the maximum spatial dimension and duration of the gaps with the magnitudes of the impending earthquakes are obtained from the temporal-spatial parameters of gaps of 16 earthquakes.It makes a basis to apply the "region-time-length"(RTL) algorithm to study anomalous seismic activities(activation and quiescence) before moderate and great earthquakes and its application in earthquake prediction in Gansu and its nearby region.
The seismic gaps and their temporal-spatial parameters appearing around the source areas before 19 moderate-strong earthquakes in Gansu and its nearby region are studied using the R-T plots method.The result shows that 16 events among the 19 earthquakes formed seismic gaps before main shocks.The empirical formulas connecting the maximum spatial dimension and duration of the gaps with the magnitudes of the impending earthquakes are obtained from the temporal-spatial parameters of gaps of 16 earthquakes.It makes a basis to apply the "region-time-length"(RTL) algorithm to study anomalous seismic activities(activation and quiescence) before moderate and great earthquakes and its application in earthquake prediction in Gansu and its nearby region.
引文
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[2]Sobolev G A,Tyupkin Y S,Low-seismicity precursors of largeearthquakes in Kamchatka[J].Volc.Seis.,1997,18:433-446.
[3]Chen Chienchih,Wu Yixuan.An improved region-time-lengthalgorithm applied to the 1999 Chi-chi,Taiwan earthquake[J].Geophys.J.Int.,2006,166:1144-1147.
[4]荣代潞,李亚荣.“区域—时间—长度”算法中特征参数的估计及应用[J].地震学报,2007,29(3):250-257.
[5]Hainzl S,Zoller G,Kurths J.Similar power laws for foreshock andaftershock sequences in a spring-block model for earthquakes[J].J.Geophys.Res.,1999,104:7243-7254.
[6]Hainzl S,Zoller G,Kurths J.Seismic quiescence as an indicatorfor large earthquakes in a system of self-organized criticality[J].Geophys.Res.Lett.,2000,27:597-600.
[7]韩渭宾,席敦礼.四川地区强震前弱震空区的变化特征[J].地震学报,1984,6(1):8-21.
[8]何秀琴,牛旺祥,王珍.永登5.8级地震前几项测震学指标的异常分析[J].西北地震学报,1996,18(3):79-83.
[9]毕秋菊.动态空区法在永登5.8级地震回顾性预报中的应用[J].西北地震学报,1996,18(3):30-36.
[10]刘小凤,肖丽珠,梅秀萍,等.祁连山地震带地震活动特征及序列类型[J].西北地震学报,2005,27(1):56-60.
[11]高立新,曹井泉.强震前震中区附近地震学参数中期震兆标志研究[J].西北地震学报,2004,26(4):347-352.
[12]李亚荣,荣代路,韩晓明.2003年岷县5.5级地震地震学前兆特征及预报意义[J].西北地震学报,2007,29(2):150-155.
[13]袁道阳,何文贵,刘小凤,等.10余年来甘肃省中强地震的发震构造特征[J].西北地震学报,2006,28(3):235-241.
[14]张伶,熊晓易,曹克信,等.甘肃省地震目录(1980—1987)[M].兰州:甘肃科学技术出版社,1988.
[15]国家地震局地球物理研究所.近震震级[M].北京:地震出版社,1978:252.
[16]中国科学院数学研究所,厦门大学,数学手册编写组.数学手册[M].北京:人民教育出版社,1979:837.
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