中强地震前朝阳地震台地倾斜异常特征分析
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摘要
辽宁省朝阳地震台地倾斜长期可靠的资料,在多次中强地震前出现明显的中短期异常,为预报地震提供了重要依据。本文研究讨论了距朝阳台600km范围内发生的10次地震(4.5≤M≤6.2)前兆异常特征,结果表明:朝阳台倾斜异常的时间、形态、方向与所处的构造位置有关。异常持续时间与震中距呈现明显的线性关系,异常形态与地震的空间位置有关,短期异常是判定地震发生时间的重要指标。在此基础上判断朝阳地倾斜目前所处的异常阶段,分析预测了未来地震发生的区域和强度。
The moderate-short term anomalies before the moderate-strong earthquakes were finded by a long-term and reliable data of the ground tilt at Chaoyang seismic station in Liaoning province,it was an impotant basis for the earthquake prediction.The precursory anomalous characteristics of 10 earthquakes(4.2≤M≤6.2)which were within 600 km of the Chaoyang station were analyzed in this paper.The results showed that the time,form,derection related to the structural position,the anomalous continuous time and epicentral distance appeared linear dependence,the anomalous form related to the spacil position of the earthquake,the sort term anomalies were an important target for judging the seismogenic time.On the basis of analyzing anomalous stage of Chaoyang station at presant,the area and magnitude of earthquake in the future was predicted.
The moderate-short term anomalies before the moderate-strong earthquakes were finded by a long-term and reliable data of the ground tilt at Chaoyang seismic station in Liaoning province,it was an impotant basis for the earthquake prediction.The precursory anomalous characteristics of 10 earthquakes(4.2≤M≤6.2)which were within 600 km of the Chaoyang station were analyzed in this paper.The results showed that the time,form,derection related to the structural position,the anomalous continuous time and epicentral distance appeared linear dependence,the anomalous form related to the spacil position of the earthquake,the sort term anomalies were an important target for judging the seismogenic time.On the basis of analyzing anomalous stage of Chaoyang station at presant,the area and magnitude of earthquake in the future was predicted.
引文
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[2]薛艳,刘浦雄,韩丹.辽宁-内蒙古地区北西向地震条带的特征及意义〔J〕.地震,2004,24(增):84-89.
[3]张国民,李丽,焦明若.张北6.2级地震与地震成组活动,〔J〕地震,1999.14(2):107-117.
[4]刘宝峰,张先康,张成科等.华北文安一蔚县一察哈尔右翼中旗剖面s波资料的地质解释,地震地质,2000,22(1):81-88.
[5]陈连旺、陆远忠、郭若眉等.华北地区断层运动与三维构造应力场的演化,地震学报,2004,Vol.23,No.4:349-361.
[6]王玉莹,白启光,张建一等.内蒙两次5.9级地震与前兆异常特征的关系研究,东北地震研究,2004,4:16-21.
[7]王玉莹,佟晓辉,孙威.1999年岫岩Ms5.4级地震前震、主震、余震应变异常特征的研究,地学前缘,2003,4(2).501-502.
[8]牛安福,张兴科,张晶等.吉林汪清7.2级深震前东北地区形变场分布特征,地震,2004,1,:76-81.
[9]李占录,昆仑山口西8.1级地震易县台潮汐形变图像浅析,大地测量与地球动力学,2004,11,Vol.24,No.4:82-84.
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