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任何事物都有生有灭,地震也不例外.如果说地震的发生是它灭亡的标志,那么搞清它产生的时机及其特征,将对地震预报有一定的意义.根据震源物理的研究,一个大地震要经历很长的应变积累过程.倘若追寻历史,在地震方面运用最早的近代测量技术,恐伯数水准测量了.如海域的水准测量成果是1937年得到的,邢台是1920年,河间1919年、日本新潟1898年就有水准测量了.这些成果表明,到当地发震为止,震中附近存在一长趋势垂直地壳形变.但最初测量成果并不处于拐点,即形成时期可能还要早,可惜再早没有资料,而只有历史地震了.我国地震记载已有四千五百年的历史.分析历史地震无非是运用地震能量(烈度、应变大同小异)和频度,但测定历史地震能量精度较差,提取地区信息量也不如频度.那么,地震频度和地壳应力变化是什么关系呢?美国兰吉利油田、落基山军工厂、日本松代几口油井压力、出油量与小震频度有着很好的对应关系;北京西郊有
Earthquakes are no exception.If the occurrence of an earthquake is a sign of its demise, figuring out the timing and characteristics of the earthquake will have certain significance for the earthquake prediction.According to the study of source physics, A large earthquake to go through a long process of accumulation of strain .If the pursuit of history, the use of earthquake in the earliest modern measurement techniques, the Hornet level measurement .As the sea level measurement results obtained in 1937, Xingtai in 1920, In Hejian, Japan, 1919, there was a leveling survey of Niigata, Japan in 1898. These results show that there is a long-term vertical crustal deformation near the epicenter by the onset of earthquakes, but the initial measurement is not at the inflection point, that is, the formative period may have to It is a pity that there is no information anymore but only historical earthquakes, and the records of earthquakes in China have been 4,500 years ago. Analysis of historical earthquakes is nothing more than the use of seismic energy (similar in intensity and strain) and frequency, but the historical seismic energy The accuracy is poor, the extraction of regional information is not as good as the frequency.Then, what is the relationship between the frequency of earthquakes and the change of crustal stress? The United States Langeli Oilfield, Rocky Mountain Military Factory, Matsushiro few mouthfuls of oil pressure, the oil and the frequency of small earthquakes has a good relationship; there are the west of Beijing