台湾花莲海域强震的同震响应特征
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摘要
从面波延迟时间、最大变形幅度、同震持续时间3个方面研究厦门地震台数字化观测仪器对2009年台湾花莲海域2次强震的同震响应特征,结果表明:对同一地点的地震,同震响应面波的延迟时间相同,持续时间与观测仪的分辨率有关;同震响应幅度与地震的震级正相关,与地震发生的方位有关:同震响应的形态以高频脉冲为主,有时伴有阶跃。为今后解释形变短临前兆现象、提取短临前兆信息及依据短临前兆信号对潜在地震的定位等提供基础。
In this paper,three aspects of coseismic response to two strong earthquakes in Taiwan's Hualien area in 2009 are studied: delay time of surface wave, maximum deformation amplitude and lasting time of coseismic response.The result shows that the time delay of surface wave is the same to earthquakes at the same place;the lasting time of the coseismic response is relate to the resolution ratio of the observation instrument;the amplitude of the coseismic response is positive correlated with the magnitude of the earthquake.The coseismic responses are mostly high-frequency impulse and sometimes accompanied with phase step.The result may helps us get a better understanding of the performance of digital observation instruments,provides us a way to study short-impending anomaly prior to earthquakes.
In this paper,three aspects of coseismic response to two strong earthquakes in Taiwan's Hualien area in 2009 are studied: delay time of surface wave, maximum deformation amplitude and lasting time of coseismic response.The result shows that the time delay of surface wave is the same to earthquakes at the same place;the lasting time of the coseismic response is relate to the resolution ratio of the observation instrument;the amplitude of the coseismic response is positive correlated with the magnitude of the earthquake.The coseismic responses are mostly high-frequency impulse and sometimes accompanied with phase step.The result may helps us get a better understanding of the performance of digital observation instruments,provides us a way to study short-impending anomaly prior to earthquakes.
引文
[1]牛安福,张晶,吉平.强地震引起的同震形变响应[J].内陆地震,2005,19(1):1-7.
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[4]方宏芳,张凯,张翊宁.福建省钻孔应变仪同震响应分析[J].内陆地震,2010,24(3):275-280.
[5]杨跃文,夏丽红,褚金学,等.云南丽江井水位与水温对印尼8.5级地震和汶川8.0级地震的同震响应特征分析[J].防灾减灾学报,2010,26(2):36-39.
[6]刘水莲,刘礼诚,黄跃进,等.小波分析在永安地震台前兆观测资料处理中的应用[J].华北地震科学,2010,28(3):53-57.
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[9]吴绍祖,陈光,李祖宁,等.汶川8.0级地震前后福建地区形变及应力场演化[J].华北地震科学,2009,(4):31-35.
[10]杨婕.厦门地震台数字化仪器零点台阶产生原因探讨[J].地震地磁观测与研究,2009,30(1):98-102.
[11]杨婕,占惠,凌学才.强降水对厦门地震台伸缩仪的影响[J].大地测量与地球动力学,2009,29(B08):76-78,102.
[12]熊先保,黄晓华,杨婕,等.厦门台地倾斜观测资料中海潮干扰的综合特征[J].大地测量与地球动力学,2009,29(2):43-47.
[13]熊先保,黄晓华,杨婕,等.海潮对厦门台地倾斜干扰的可能机制[J].大地测量与地球动力学,2007,27(6):45-50.
[14]孙毅,程万正.特大远震引起的形变观测变化图像[J].内陆地震.2005,19(3):264-270.
[2]牛安福,吉平,高福旺,等.印尼强地震引起的同震形变波[J].地震,2006,26(1):131-137.
[3]张晶,牛安福,高福旺,等.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.
[4]方宏芳,张凯,张翊宁.福建省钻孔应变仪同震响应分析[J].内陆地震,2010,24(3):275-280.
[5]杨跃文,夏丽红,褚金学,等.云南丽江井水位与水温对印尼8.5级地震和汶川8.0级地震的同震响应特征分析[J].防灾减灾学报,2010,26(2):36-39.
[6]刘水莲,刘礼诚,黄跃进,等.小波分析在永安地震台前兆观测资料处理中的应用[J].华北地震科学,2010,28(3):53-57.
[7]邱永平.宁波地震台动水位与垂直摆对汶川8.0级地震的同震变化[J].华北地震科学,2009,(1):30-33.
[8]苏树朋,李津津,张勤,等.易县地震台形变资料对汶川8.0级大地震的反应[J].华北地震科学,2009,(2):54-58.
[9]吴绍祖,陈光,李祖宁,等.汶川8.0级地震前后福建地区形变及应力场演化[J].华北地震科学,2009,(4):31-35.
[10]杨婕.厦门地震台数字化仪器零点台阶产生原因探讨[J].地震地磁观测与研究,2009,30(1):98-102.
[11]杨婕,占惠,凌学才.强降水对厦门地震台伸缩仪的影响[J].大地测量与地球动力学,2009,29(B08):76-78,102.
[12]熊先保,黄晓华,杨婕,等.厦门台地倾斜观测资料中海潮干扰的综合特征[J].大地测量与地球动力学,2009,29(2):43-47.
[13]熊先保,黄晓华,杨婕,等.海潮对厦门台地倾斜干扰的可能机制[J].大地测量与地球动力学,2007,27(6):45-50.
[14]孙毅,程万正.特大远震引起的形变观测变化图像[J].内陆地震.2005,19(3):264-270.
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