Comparison Between Lurr And State Vector Analysis Before Strong Earthquakes In Southern California Since 1980

There are seven strong earthquakes with M >= 6.5 that occurred in southern California during the period from 1980 to 2005. In this paper, these earthquakes were studied by the LURR (Load/Unload Response Ratio) method and the State Vector method to detect if there are anomalies before them. The results show that LURR anomalies appeared before 6 earthquakes out of 7 and State Vector anomalies appeared before all 7 earthquakes. For the LURR method, the interval between maximum LURR value and the forthcoming earthquake is 1 to 19 months, and the dominant mean interval is about 10.7 months. For the State Vector method, the interval between the maximum modulus of increment State Vector and the forthcoming earthquake is from 3 to 27 months, but the dominant mean interval between the occurrence time of the maximum State Vector anomaly and the forthcoming earthquake is about 4.7 months. The results also show that the minimum valid space window scale for the LURR and the State Vector is a circle with a radius of 100 km and a square of 3 degrees 3 degrees, respectively. These results imply that the State Vector method is more effective for short-term earthquake prediction than the LURR method, however the LURR method is more effective for location prediction than the State Vector method.

强激光与物质的相互作用

<正> 激光自1960年问世后(Maiman,1960),立即引起世界各国的重视,发展极为迅速。对强激光研究的兴趣则是由于激光武器和激光引发核聚变的刺激而产生的。 强激光与物质的相互作用是包含多方面理论和实验研究的课题,它涉及物理学和力学的许多重要分支,如激光物理、原子分子物理、非线性光学、等离子体动力学、热力学、爆炸力学、断裂力学、物理力学等。在应用方面,强激光与物质的相互作用又是与多种重大的工程技术相联系的,这些重大技术关键的突破,有可能引起工业发展和能源利用方面的一系列