关键词: 声发射, 波形分析, 谱, 震源机制, 雁列断层

Abstract: In this paper the difference in waves, frequences, and sources mechanism is analyzed by com-paring the characteristics of acoustic emissions in the rock bridge of tensile en echelon structurewith that in the rock bridge of compressive shear structure,or that on main fault so as to revealthe characteristics of acoustic emissions in en echelon structure,The result shows that acoustic e-missions in en echelon structure have several mechanisms. The acoustic emission in the rockbridge of tensile en echelon structure is of one single event,its amplitude of waveform is verysmall with short duration time and higher main frequency,and mechanism of acoustic emissionsbeing tensile. The acoustic emission in the rock bridge of compressive shear en echelon structureis also of single event with larger amplitude of waveform,short duration time and lower main fre-quency,and mechanism of acoustic emissions being compressive shear. But the acoustic emissionon main fault of en echelon structure is of multiple events with largest amplitude of waveform,longer duration time and lowest main frequency,and mechanism of acoustic emissions being com-pressive shear whose direction of fracture is opposite to that of that in the rock bridge of compres-sive shear.

Key words: Acoustic emission, Waveform analysis, Spectrum, Focal mechanism, en echelon fault