根据构造环境剪应力值水平区分地震和核爆炸
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摘要
根据地震破裂的断裂力学模式 ,导出了震源参数与地震发生处的构造环境剪应力值 τ0之间的函数关系 .据此 ,可以大量计算震源处的构造环境剪应力值或背景应力值 .若把核爆炸当作地震来计算 ,发现核爆炸的 τ0 值平均在 2 0 MPa左右 ,明显地高于同震级地震的 τ0值 .其结果可以作为区分地震与核爆炸的依据
On the basis of fracture mechanics earthquake rupture model, Chen, et al. have derived relations between source parameters and τ 0 , the value of tectonic ambient shear stress in the place where the earthquake occurs. Thus, we can calculate a large number of values of tectonic ambient shear stress or values of background stress in the place where the earthquake occurs. If nuclear explosions are treated as earthquakes in the calculation, we find that τ 0 values of nuclear explosions have about 20 MPa, which is obviously higher than average τ 0 values of earthquakes with the same magnitude. This result can be used to discriminate nuclear explosions from earthquakes.
On the basis of fracture mechanics earthquake rupture model, Chen, et al. have derived relations between source parameters and τ 0 , the value of tectonic ambient shear stress in the place where the earthquake occurs. Thus, we can calculate a large number of values of tectonic ambient shear stress or values of background stress in the place where the earthquake occurs. If nuclear explosions are treated as earthquakes in the calculation, we find that τ 0 values of nuclear explosions have about 20 MPa, which is obviously higher than average τ 0 values of earthquakes with the same magnitude. This result can be used to discriminate nuclear explosions from earthquakes.
引文
1 USGS. 1 989～ 1 994 . Earthquake data report.
白彤霞 . 1 996.根据环境应力场方法确定地震危险区的 3年实践检验 [J].地震地磁观测与研究 ,1 7( 1 ) :3 9～ 4 8
陈培善 ,谷继成 ,李文香 . 1 977.从断裂力学观点研究地震的破裂过程和地震预报 [J].地球物理学报 ,2 0 ( 3 ) :1 85～ 2 0 2
陈培善 ,陈海通 . 1 992 .由环境应力值确定地震危险区的尝试 [J].地震地磁观测与研究 ,1 3 ( 6) :1～ 1 1
陈培善 ,Duda S J. 1 993 .地震辐射能对环境应力的依赖性 [J].地震学报 ,1 5( 2 ) :1 4 6～ 1 52
陈培善 ,肖磊 ,白彤霞 . 1 995.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 ,1 7( 3 ) :2 94～ 3 0 4
陈培善 ,肖磊 ,白彤霞 ,等 . 1 998.美国南加州的构造应力场和地震危险区 [J].地震学报 ,2 0 ( 2 )∶ 1 2 8～ 1 3 6
吴忠良 ,陈运泰 ,牟其铎 . 1 994 .核爆炸地震概要 [M].北京 ,地震出版社 ,1 4 4Chen Peishan,Duda S J. 1 996.Fracture mechanics rupture model of earthquakes and an estimate of ambientshear stress[J]. Phys Earth Planet Inter,93 ( 3 -4 ) :2 99～ 3 0 8
Peppin W A Z,Mc Evilly T V. 1 974 . Discrimination among small magnitude events on Navada Test Site[J]. Geophys Jastr Soc,3 7:2 2 7～ 2 4 3
Richards P G,Zarales J. 1 990 . Seismic discrimination of nuclear explosions[J]. Ann Rev Earth Planet Soc,1 8:2 57～2 86
白彤霞 . 1 996.根据环境应力场方法确定地震危险区的 3年实践检验 [J].地震地磁观测与研究 ,1 7( 1 ) :3 9～ 4 8
陈培善 ,谷继成 ,李文香 . 1 977.从断裂力学观点研究地震的破裂过程和地震预报 [J].地球物理学报 ,2 0 ( 3 ) :1 85～ 2 0 2
陈培善 ,陈海通 . 1 992 .由环境应力值确定地震危险区的尝试 [J].地震地磁观测与研究 ,1 3 ( 6) :1～ 1 1
陈培善 ,Duda S J. 1 993 .地震辐射能对环境应力的依赖性 [J].地震学报 ,1 5( 2 ) :1 4 6～ 1 52
陈培善 ,肖磊 ,白彤霞 . 1 995.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 ,1 7( 3 ) :2 94～ 3 0 4
陈培善 ,肖磊 ,白彤霞 ,等 . 1 998.美国南加州的构造应力场和地震危险区 [J].地震学报 ,2 0 ( 2 )∶ 1 2 8～ 1 3 6
吴忠良 ,陈运泰 ,牟其铎 . 1 994 .核爆炸地震概要 [M].北京 ,地震出版社 ,1 4 4Chen Peishan,Duda S J. 1 996.Fracture mechanics rupture model of earthquakes and an estimate of ambientshear stress[J]. Phys Earth Planet Inter,93 ( 3 -4 ) :2 99～ 3 0 8
Peppin W A Z,Mc Evilly T V. 1 974 . Discrimination among small magnitude events on Navada Test Site[J]. Geophys Jastr Soc,3 7:2 2 7～ 2 4 3
Richards P G,Zarales J. 1 990 . Seismic discrimination of nuclear explosions[J]. Ann Rev Earth Planet Soc,1 8:2 57～2 86
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