摘要
根据对包括汶川大地震等一些实测资料的分析,并借用断裂力学和断裂物理的概念,可以认为存在一种震前出现的"微破裂波"。即,震前地层中发生的"微破裂"过程可以产生"微破裂波"。由于破裂过程的微观复杂性,微破裂波中有电磁波、声波和重力波等不同成分,而且有频率覆盖范围宽、信号相对较弱等特点。微破裂波一般都产生于主破裂之前约1～10天之内。只要有合适的有着足够高灵敏度和足够宽的频率响应能力的仪器系统,就可能探测到微破裂波,也就获取了一种重要的有临震预警意义的信息。
With a recheck of the observing data of Wenchuan and some other earthquakes, also based on the concept of fracture mechanics, it is deemed that there exists a micro-fracture wave before earthquakes. According to this supposition, before an earthquake, the micro fracture occurred in the stratum will result in a micro-fracture wave. Due to the complexity of the fracture process, the wave may consist of electromagnetic, supersonic and gravitational fluctuations, which frequency range is quite wide and intensities are rather weak. The micro fracture wave presents commonly prior to the earthquake for 1 - 10 days, therefore, as long as it is detected with proper instrumental systems （ with enough high sensitivity and wide coverage of frequency）, it might serve as a useful precursory signal for earthquakes.
出处
《国际地震动态》
2009年第6期19-23,共5页
Recent Developments in World Seismology
关键词
地震
断裂力学
岩石破裂
微破裂
微破裂波
earthquake
fracture mechanics
rock fracture
micro-fracture
micro-fracturewave
