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有一组希腊物理学家研制成了一种建立在利用压电效应基础上的新颖仪器。目前用它来预报小地震还是相当成功的。以雅典大学亚历克波洛斯(C.Alexopoul-os)教授为首的一组希腊学者研究的这种方法充分运用1981年2月袭击希腊的大地震及其后来的余震的经验为基础而发明的。这项研究的根据就是大家熟悉的压电效应,即晶体被拉伸或压缩时便会产生电流。如果岩石里包含有一小点表面带电的晶体结构,同时承受着不断增加的压力,则会给出短时间的电脉冲,即瞬息扰动,它的出现比岩石发生破裂早得多,希腊物理学家认为可以利用这种现象预报地震。在1981年发生地震之后的数周内,发现了许多不规则的叠加在岩石正常电活动性上的类似脉冲。它们与次生振动符合得很好,每次都
A group of Greek physicists developed a novel instrument based on the piezoelectric effect. The current use of it to predict small earthquakes is still quite successful. This method, which was studied by a group of Greek scholars headed by Professor A. Alexopoul-os of the University of Athens, was based on the experience gained from the February 1981 earthquake in Greece and its aftershocks . The research is based on the familiar piezoelectric effect that current is generated when crystals are stretched or compressed. If the rock contains a small surface charged crystal structure, while under increasing pressure, it will give a short period of electrical impulses, that is, transient disturbance, which appeared earlier than the rock rupture, the Greek physicist It is thought that this phenomenon can be used to predict earthquakes. Within weeks after the earthquake in 1981, many irregular pulses superimposed on normal electrical activity of rocks were found. They work well with secondary vibrations, each time