广东地区4级左右地震前环境剪应力场的变化
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摘要
根据1993年陈培善等导出的峰值加速度、峰值速度和峰值位移与构造环境剪应力场τ0的关系,利用广东省数字地震记录研究了广东地区4级左右地震前后环境剪应力场的变化。结果显示,地震前并未观察到中短期异常变化,以短临变化为主,震前3～15天应力等级显著上升,应力等级相对主震后余震以及较早前的小震都要高,且个别小震平均应力等级大于3这一异常现象。
The relations (P.S. Chen et al, 1993) between the peak acceleration, velocity, displacement and the tectonic environment shear stress field τ0 , can be used to estimate τ0 values for small earthquakes. The variation of tectonic environment shear stress field was studied with the data of Guangdong Digital Telemetry Seismograph Network. The result shows the mid-term and short-term anomalies could not be detected before the moderate and small earthquakes, but the short-term and impending anomalies appeared. The value of stress grade obviously raise before the earthquakes 3- 15 days, and the value of stress grade is higher than others which estimated by the aftershocks and the small earthquakes occurred early.
The relations (P.S. Chen et al, 1993) between the peak acceleration, velocity, displacement and the tectonic environment shear stress field τ0 , can be used to estimate τ0 values for small earthquakes. The variation of tectonic environment shear stress field was studied with the data of Guangdong Digital Telemetry Seismograph Network. The result shows the mid-term and short-term anomalies could not be detected before the moderate and small earthquakes, but the short-term and impending anomalies appeared. The value of stress grade obviously raise before the earthquakes 3- 15 days, and the value of stress grade is higher than others which estimated by the aftershocks and the small earthquakes occurred early.
引文
白彤霞,陈培善.1998． 利用北京数字化台网资料估计首都圈地区的构造环境剪应力场[J].华南地震,18(1) :9～13
白彤霞.1996． 根据环境应力场确定地震危险区的3年实践检验[J].地震地磁观测与研究,17(1) :39-48
白彤霞.1997． 京津唐地区近期发生大震的可能性[J].地震地磁观测与研究,18(1) :58-64
陈培善,S J Duda.1993． 峰值速度和加速度对环境剪应力的依赖性[J].地球物理学报,36(2) :185～194
陈培善,白彤霞,肖磊.1995． 根据环境应力场寻找中国大陆地区的潜在震源区[J].地震学报,17(3) :294-304
陈培善,陈海通.1992． 由环境应力值寻找地震危险区的尝试[J].地震地磁观测与研究,13(6) :1～11
陈培善,肖磊,白彤霞,王溪莉.1994． 唐山地震序列的环境应力场[J].地震学报,16(4) :440-447
陈培善,肖磊,白彤霞等.1998． 美国南加州的构造环境剪应力场和地震危险区[J].地震学报,20(2) :128-136
王绍晋,龙晓帆.1998． 丽江地震前后震区环境应力场时空变化[J].地震地磁观测与研究,19(4) :17-24
王绍晋,龙晓帆.1999． 云南三次强震前后环境剪应力场动态变化[J].地震学报,21(2) :150～158
王绍晋,秦嘉政,黄毓珍.2002． 环境剪应力场动态变化在施甸地震中短期预测中的应用[J].地震研究,25(3) :233-239
魏柏林,冯绚敏,陈定国等.2001． 东南沿海地震活动特征[M].北京:地震出版社
闻则刚,胡秀敏,何(?)琳等.2000． 应用数字地震台网资料求解广东地区的环境剪应力场[J].华南地震,20(4) :54-59
闻则刚.1998． ART算法的改进及其实际应用--面波Q值反演[J].华南地震,18(2) :37-41
Chen P S and Duda S J. 1993． Fracture mechanics rupture model of earthquakes and an estimate of ambient shear stress [J]. Physics of earth & planetary interiors, (3-4) , 299-308
白彤霞.1996． 根据环境应力场确定地震危险区的3年实践检验[J].地震地磁观测与研究,17(1) :39-48
白彤霞.1997． 京津唐地区近期发生大震的可能性[J].地震地磁观测与研究,18(1) :58-64
陈培善,S J Duda.1993． 峰值速度和加速度对环境剪应力的依赖性[J].地球物理学报,36(2) :185～194
陈培善,白彤霞,肖磊.1995． 根据环境应力场寻找中国大陆地区的潜在震源区[J].地震学报,17(3) :294-304
陈培善,陈海通.1992． 由环境应力值寻找地震危险区的尝试[J].地震地磁观测与研究,13(6) :1～11
陈培善,肖磊,白彤霞,王溪莉.1994． 唐山地震序列的环境应力场[J].地震学报,16(4) :440-447
陈培善,肖磊,白彤霞等.1998． 美国南加州的构造环境剪应力场和地震危险区[J].地震学报,20(2) :128-136
王绍晋,龙晓帆.1998． 丽江地震前后震区环境应力场时空变化[J].地震地磁观测与研究,19(4) :17-24
王绍晋,龙晓帆.1999． 云南三次强震前后环境剪应力场动态变化[J].地震学报,21(2) :150～158
王绍晋,秦嘉政,黄毓珍.2002． 环境剪应力场动态变化在施甸地震中短期预测中的应用[J].地震研究,25(3) :233-239
魏柏林,冯绚敏,陈定国等.2001． 东南沿海地震活动特征[M].北京:地震出版社
闻则刚,胡秀敏,何(?)琳等.2000． 应用数字地震台网资料求解广东地区的环境剪应力场[J].华南地震,20(4) :54-59
闻则刚.1998． ART算法的改进及其实际应用--面波Q值反演[J].华南地震,18(2) :37-41
Chen P S and Duda S J. 1993． Fracture mechanics rupture model of earthquakes and an estimate of ambient shear stress [J]. Physics of earth & planetary interiors, (3-4) , 299-308
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