濮阳M_L4.6地震前泰安台形变异常特征分析
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摘要
濮阳ML4.6地震前泰安台水平摆、垂直摆倾斜仪观测资料出现了显著的短、临前兆异常,地震发生在异常达最大值前后,且震中背向异常初期地壳的倾斜方向。根据泰安台与濮阳震中之间纵横交错的多条断层分析,泰安台倾斜仪出现的短、临前兆异常很可能反映了大区域应力场及相关的多条断层活动的综合效应,是"场兆"异常。
Some distinct short-term precursory anomalies were found in the level pendulum and vertical pendulum tiltmeter observations at Taian seismostation before the ML4.6 Puyang earthquake.The earthquake took place when the anomalies reached the peak and their trend is in the opposite directions of the epicenter.Because of the existence of many crossing faults between Taian station and Puyang epicentral region,the short-impending anomaly from the tiltmeter at Taian station may be the synthetic effect from the dange of large regional stress field and related faults' movement,it is a"field" anomaly.
Some distinct short-term precursory anomalies were found in the level pendulum and vertical pendulum tiltmeter observations at Taian seismostation before the ML4.6 Puyang earthquake.The earthquake took place when the anomalies reached the peak and their trend is in the opposite directions of the epicenter.Because of the existence of many crossing faults between Taian station and Puyang epicentral region,the short-impending anomaly from the tiltmeter at Taian station may be the synthetic effect from the dange of large regional stress field and related faults' movement,it is a"field" anomaly.
引文
[1]张玲,周翠英.山东地区近期地震应力场分析及2006年地震趋势预测,山东省2006年度地震趋势研究报告,2005年12月.
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1李杰,等.山东省地形变数字化与模拟观测资料的对比分析[J].大地测量与地球动力学,2003,23(1):85～92.1Li Jie,et al.Contrast and analysis of digital deformation dataat stations in Shandong province[J].Journal of Geodesy andGeodynamics,2003,23(1):85-92.(in Chinese)
2李杰,等.TJ-Ⅱ型钻孔体应变仪数字化观测资料分析[J].大地测量与地球动力学,2002,22(3):69～74.2Li Jie,et al.Analysis of digitized observations of TJ-Ⅱbore-hole strain meters[J].Journal of Geodesy and Geodynamics,2002,22(3):69-74.(in Chinese)
3陈德福.地壳形变动力学观测与研究[M].北京:海洋出版社,1993.3Chen Defu.The dyna,ical observation and research of crustaldeformation[M].Beijing:oceanic Press,1993.(in Chinese)
4蒋骏,等.地震前兆信息处理与软件系统(EIS2000)[M].北京:地震出版社,2000.4Jiang Jun,et al.Information processing and software systemof earthquake precursor(EIS2000)[M].Beijing:Seismologi-cal Press,2000.(in Chinese)
5牛安福,等.地壳持续加速变形与地震关系研究[J].大地测量与地球动力学,2002,22(1):29～33.5Niu Anfu,et al.Study on the continuously accelerated de-formation and the relationship with earthquakes[J].Journalof Geodesy and Geodynamics,2002,22(1):29-33.(inChinese)
6张晶,张立.中强震前形变固体潮汐资料短期信息的提取[J].地震,2003,23(3):71～78.6Zhang Jing and Zhang Li.Short-term anomaly extracted fromtidal deformation data before moderately strong earthquake[J].Earthquake,2003,23(3):29-33.(in Chinese)
7张晶,等.强震前形变潮汐异常判别与机理研究[J].地震学报,2006,28(2):150～157.7Zhang Jing,et al.Research on distinguishing method andmechanism of tidal deformation anomalies before large earth-quake[J].Acta Seismologica Sinica,2006,28(2):150-157.(in Chinese)
8张超,陈连旺.我国大陆断层现代形变与地震活动关系的研究[A].地震短临预报的理论与方法——“八五”攻关三级课题论文集[C].北京:地震出版社,1997.8Zhang Chao and Chen Lianwang.Study on the relation ofcontinental faultage deformation and seismic activity aboutChina[A].The method and theory of earthquake short peri-od prediction of China——the third problem memoir in“85”period[C].Beijing:Seismological Press,1997.(inChinese)
9李杰,等.岫岩Ms5.4地震前烟台形变异常特征及机理分析[J].地震,2006,26(3):71～78.9Li Jie,et al.Study on the characteristics and mechanism ofdeformation anomaly in Yantai region before Xiuyan earth-quake withMs5.4[J].Earthquake,2006,26(3):71-78.(in Chinese)
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