地震孕育过程中的前兆地声

PRECURSORY EARTH SOUNDS IN THE SEISMOGENIC PROCESS

本文介绍了有关地声观测技术和前兆地声机制的综合研究结果,为了获得连续可靠的地声信息,研制了四路慢速磁带仪等地声极微震记录仪。经过四年连续野外观测记录证明了它的稳定性和实用性;为了解决地声源定位问题,在山东莒县及云南洱源建立了标准地声台网,进行了连续四年记录,取得了可靠的资料;为了解决地声信号处理问题,建立了全国地声数据处理中心,及相应的时间序列和地声资料处理程序库。在上述工作基础上进行了长期连续观测和全面的基础研究。通过观测,获得了可靠的前兆地声信息,特别是第一次用仪器记录到了可听前兆地声,提前时间为3—15分钟。观测研究表明前兆地声确实存在,地声可以作为地震预报的一种重要方法。

This paper introduces the result of comprehensive studies concerning the techniques for earth sound observation and the mechanism of the precursory earth sounds.In order io get continuous and reliable earth sound data, the 4-channel, low-speed tape recorder and other instruments were developed for registering the extremely-small earthquakes.4 years of continuous field observational recording has proved that the instruments are both stable and practical. In order to locate the earth sound sources, standard earth sound observation network were respectively set up in Juxian County of Shandong Province and Er-yuan County of Yunnan Province. By successively carrying out 4-years of observational recording, reliable earth sound data were cumulated. In order to process the earth sound data, the National Earth Sound Data Processing Center as well as data banks of relevant time series and earth sound processing programs were established.On the basis of the above-mentioned work, a long term of continuous observation and extensive basic studies have been conducted.Through the observation, reliable precursory earth sound data were registered. It: should bo particularly mentioned that it was the first time that audible precursory earth sound signals appearing 8-15 minutes prior to the earthquake occurrences were instrumentally recorded. Our observational study shows that precursory earth sounds do exist, and that such earth sounds might be used as an important means in earthquake prediction.