泰安地震台SSQ-2数字水平摆曲线畸变分析
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摘要
对山东泰安地震台数字化水平摆10年的观测资料中的典型畸变现象进行了分类,具体为:1)大幅度漂移,趋势性改变;2)单日固体潮畸变;3)多日固体潮畸变伴频繁掉格;4)频繁掉格,固体潮无明显畸变。NS分量畸变以趋势改变、固体潮升降变化为主,EW分量畸变以频繁掉格为主。映震能力:对震中距2 000~5 000 km大于7级以上的地震有反应,甚至远于5 000 km的极远震也有为数不少的震前畸变出现。
The observations of digital horizontal pendulum of Taian seismostation for 10 years was systematically summarized.After excluding disturbance the typical variation of recorded data is classified and analysed.Basically,there are four types of variation as follows: 1) wide shift,trend change;2)earth tide distortion of single day;3) multi-day earth tide distortion accompanied with frequent zero-drift;4) frequent zero-drift without obvious variation of earth tide.Trend change and earth tide alteration dominate the NS component distortion while frequent zero-drift reigns the EW component.The relation between distortion and earthquakes is that: The pre-earthquake distortions appear as earthquakes of magnitude lager than 7.0 with epicenter distance 2 000-5 000 km.The pre-earthquake distortions accompany with some earthquakes father than 5 000 km.
The observations of digital horizontal pendulum of Taian seismostation for 10 years was systematically summarized.After excluding disturbance the typical variation of recorded data is classified and analysed.Basically,there are four types of variation as follows: 1) wide shift,trend change;2)earth tide distortion of single day;3) multi-day earth tide distortion accompanied with frequent zero-drift;4) frequent zero-drift without obvious variation of earth tide.Trend change and earth tide alteration dominate the NS component distortion while frequent zero-drift reigns the EW component.The relation between distortion and earthquakes is that: The pre-earthquake distortions appear as earthquakes of magnitude lager than 7.0 with epicenter distance 2 000-5 000 km.The pre-earthquake distortions accompany with some earthquakes father than 5 000 km.
引文
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2黄晓华,陈智勇,林立峰.数字化形变观测典型曲线畸变分类与说明[J].华南地震,2008,28(4):142-148.
3李杰,等.濮阳ML4.6地震前泰安台形变异常特征分析[J].大地测量与地球动力学,2007,(4):100-104.
4张晶,牛安福,高福旺.数字化形变观测提取的地震短临异常特征[J].地震,2003,23(1):70-76.
5陈德福.潮汐形变短临异常现象及其时空特征[J].华南地震,2006,26(1):89-105.
6陈德福,罗荣祥,刘国培.地壳形变动力学观测与研究——倾斜异常图象分类及其特征浅析[M].北京:海洋出版社,1993.
7赵小贺,等.形变数字化观测干扰分析[J].地震地磁观测与研究,2009,30(4):55-62.
8胡小钢,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,(5):1 363-1 375.
9李杰,等.泰安重力观测高频波动信号分析[J].西北地震学报,2009,(3):265-271.
10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.
11高振强,等.山西临汾中心地震台石英摆倾斜仪前驱波特征分析[J].山西地震,2009,(2):1-6.
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