论文部分内容阅读
利用腾冲火山地区流动数字化地震台网的微震资料 ,对发生于火山区内及附近地区的 2 4个微小地震事件进行波谱分析。采用布龙模式计算震源参数。研究这些微震震源参数 ,显示位于火山区南部的热海和马鞍山一带应力降较高 ,平均达 41bar,其它地区应力降较低 ,平均在 0 1～ 4bar之间。反映了该地区应力场背景较高 ,主要以小震群、微破裂及汽爆等方式释放应力。通过对微地震记录事件的时域和频域分析 ,将腾冲火山地区微地震事件划分为四个类型 ,即包络型、汽爆型、高频型和震群型。
Based on the microseismic data of mobile digital seismic network in Tengchong volcano area, spectrum analysis was performed on 24 minor earthquakes occurred in and around the volcano area. Boolean mode is used to calculate source parameters. Studying these microseismic source parameters shows that the stress drop in the areas of Atami and Ma’anshan in the southern part of the volcano area is high with an average of 41 bar and the stress drop in other areas is low with an average of 0 1 ~ 4 bar. It reflects that the background of stress field in this area is relatively high, mainly releasing stress in small earthquake swarm, micro-fracture and steam explosion. By analyzing the time-frequency and frequency-domain analysis of microseismic events, the microseismic events in the Tengchong volcano area are divided into four types: envelope type, steam explosion type, high frequency type and swarm type.