2004年、2007年印尼两次8级强震新疆地区同震效应的对比分析
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摘要
2004年12月26日印尼8.7级和2007年9月12日印尼8.5级地震不同程度引起新疆地下流体和形变的同震效应。震后,水位首先出现同震水震波,而后出现大幅度上升现象;水温出现震时脉冲突升,震后小幅度下降,然后逐步过渡到一个新的稳定状态。两次印尼8级地震,前者较后者水温和水位同震波到时短、波幅大、振荡持续时间长。重力仪记录到变化幅度极大、到时和结束时相当清晰的同震震波,且初始到时在其他形变记录仪器之前,持续时间较长;倾斜和应变记录到同震阶跃,但持续时间相对较短。垂直摆正常波动时有明显的固体潮,地震波到时后固体潮畸形变化或消失,地震波基本衰减完后,重新出现明显固体潮。
The coseismal effect of subsurface fluid and deformation in Xinjiang was caused to different extents by two MS8.0 strong earthquake in Indonesia,in 2004 and 2007.After the earthquakes,the seismic wave of water level came first,then the water level increased enormously;The water temperature showed impulse and increased abruptly,then decreased a little,and finally got to a new stable state.After two MS8.0 strong earthquake in Indonesia,in 2004 and 2007,the seismic wave of water level and water temperature of the former had short travel time,large amplitude and long oscillation.The enormous amplitude coseismal wave with clear arrival and finish time was recorded in gravity data,and the initial arrival time came earlier than that of other deformation instruments,so was the duration longer.The short coseismal step was recorded in tilt and strain data.The normal variation of vertical pendulum had obvious earth tide.Once the seismic wave came,the shape of earth tide became malformed or disappeared and when the seismic wave weakened gradually or ended,the obvious earth tide came again.
The coseismal effect of subsurface fluid and deformation in Xinjiang was caused to different extents by two MS8.0 strong earthquake in Indonesia,in 2004 and 2007.After the earthquakes,the seismic wave of water level came first,then the water level increased enormously;The water temperature showed impulse and increased abruptly,then decreased a little,and finally got to a new stable state.After two MS8.0 strong earthquake in Indonesia,in 2004 and 2007,the seismic wave of water level and water temperature of the former had short travel time,large amplitude and long oscillation.The enormous amplitude coseismal wave with clear arrival and finish time was recorded in gravity data,and the initial arrival time came earlier than that of other deformation instruments,so was the duration longer.The short coseismal step was recorded in tilt and strain data.The normal variation of vertical pendulum had obvious earth tide.Once the seismic wave came,the shape of earth tide became malformed or disappeared and when the seismic wave weakened gradually or ended,the obvious earth tide came again.
引文
[1]崔秋文,李建一,董军,等.印度洋大地震与海啸灾害综述[J].地震科技情报快讯,2004,(23,24):16-17.
[2]郑江蓉,徐桂明,李鸿宇,等.2004年12月26日印尼8.7级地震后江苏地区同震效应分析[J].防震减灾工程学报,2005,25(1):105-113.
[3]高小其,陈华静,杨又陵,等.2004年12月26日印尼8.7级强震新疆地区的同震效应[J].地震地磁观测与研究,2006,27(3):40-46.
[4]陆明勇,黄辅琼,周峥嵘,等.地壳形变与地下水异常关系研究进展[J].大地测量与地球动力学,2004,24(3):98-104.
[5]陆明勇,黄辅琼,刘华,等.地壳变形与地下水相互作用及其异常关系初探[J].地震,2005,25(1):67-73.
[2]郑江蓉,徐桂明,李鸿宇,等.2004年12月26日印尼8.7级地震后江苏地区同震效应分析[J].防震减灾工程学报,2005,25(1):105-113.
[3]高小其,陈华静,杨又陵,等.2004年12月26日印尼8.7级强震新疆地区的同震效应[J].地震地磁观测与研究,2006,27(3):40-46.
[4]陆明勇,黄辅琼,周峥嵘,等.地壳形变与地下水异常关系研究进展[J].大地测量与地球动力学,2004,24(3):98-104.
[5]陆明勇,黄辅琼,刘华,等.地壳变形与地下水相互作用及其异常关系初探[J].地震,2005,25(1):67-73.
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