地电前兆中期向短临过渡的综合判据   总被引：1，自引：0，他引：1  

赵玉林  李正南  钱复业  王玲  陈宝华  黄燕妮 《地震》1995,(4)

通过分析唐山、大同、海城等强震的地电前兆,提出判断地震前兆的主要标准:直接或间接反映应变积累的信息可定为地震前兆。论证唐山地震前2—3年区域电阻率下降是该区震前应变积累的反映,即唐山震前地电区域下降是地震的中期前兆。地电中期前兆具有震中区幅度较大,外围较小,前兆从震中向外围传播等规律。地电前兆中期向短临过渡的判据有:加速、回返、各向异性及触发等。  相似文献   

On local and convective accelerations in steep wave events     

Atle Jensen  Didier Clamond  Morten Huseby  John Grue 《Ocean Engineering》2007,34(3-4):426-435

The local and convective accelerations of steep irregular wave events have been investigated. These properties are measured by a two-camera PIV technique. Furthermore, the experiments are compared with two different theories including a fully nonlinear and a simplified analytical model. An important result is that the convective term is of the same order of magnitude and of opposite sign as the local acceleration. The convective acceleration term can therefore not be neglected in acceleration and force estimates.  相似文献