单板机在井斜测试中的应用

本文叙述了一种用小容量的单板微处理机实现对微弱声信号提高信噪比的办法。单板机是现场应用的。声信号是从井下几百米深处传至地表的脉冲声。现场测试表明,单板机稳定可靠,可以在实际生产中推广。     

中强震的前兆地声

本文报道了滦县五级震前卢龙台站和昌黎台站的震前地声记录。从地声源的强度出发,作者对地声传播的可能距离作了初步分析。分析表明,地声一般不是来自震源,而是来自观测站附近的地下。从而说明彼此相距较远的观测站,其接收信号序列是不相关的。但由于震源体与震级成正比的关系,对于较大地震,我们仍可能在较大范围内和较早的时候收到前兆信息。     

PRECURSORY GEOSOUND OF MODERATELY STRONG EARTHQUAKES

The geosound recorded at Lulong and Changli stations prior to the Luanxian earthquake M=5is reported in this paper.Based on the strength of the geosound source,a preliminary analysis of itspossible propagation distance has been made.The analysis indicates that geosounds generally comefrom the underground near the observation stations instead of coming from the earthquake sources,so the signal sequences received at observation stations located far from each other are irrelevant.The precursory information before larger earthquakes may still be received within a large area at theearly stage so far as the earthquake source body is proportional to its magnitude.