腾冲火山区微震类型与波谱分析
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摘要
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。
Spectrum analyses have been done to 24 microseisms occurred in Tengchong volcano areas and nearby by digital data recorded at mobile seismic stations. Using Brown mode to calculate focal parameters. Studies show that there are low drops of stresses in the place of Rehai Maanshan located around southern part of the volcano areas, averaging 0 1-4Pa. It is reflected that there are higher background stress fields in the areas, mainly releasing stresses by small swarms, micro fracture and gas eruption. Through analyses of microseisms in time and frequency domains, the events can be divided into four types, envelope type, gas eruption type, high frequency type and swarms.
Spectrum analyses have been done to 24 microseisms occurred in Tengchong volcano areas and nearby by digital data recorded at mobile seismic stations. Using Brown mode to calculate focal parameters. Studies show that there are low drops of stresses in the place of Rehai Maanshan located around southern part of the volcano areas, averaging 0 1-4Pa. It is reflected that there are higher background stress fields in the areas, mainly releasing stresses by small swarms, micro fracture and gas eruption. Through analyses of microseisms in time and frequency domains, the events can be divided into four types, envelope type, gas eruption type, high frequency type and swarms.
引文
刘祖荫等 腾冲火山区地震记录事件的识别与分析 (内部研究报告 )
[1]刘宝诚等 腾冲火山地热区的微震观测 地球物理学报 ,1986,( 6) :5 47～ 5 5 5
[2 ]叶建庆等 腾冲火山地区微震观测 (Ⅰ ) 地震研究 ,1998,2 19( 4 ) :3 4 3～ 3 4 8
[3 ]叶建庆等 腾冲火山地区微震观测 (Ⅱ ) 地震研究 ,2 0 0 0 ,2 3 ( 2 )
[4]S D Malone ,火山地震 :由圣海伦斯山得到的例子 地震 :观测理论和解释 地震出版社 ,1992 2 81～ 2 94
[5 ]秦嘉政等 腾冲火山区剪切波和尾波衰减初步研究 地震研究 ,2 0 0 0 ,2 3 ( 2 )
[1]刘宝诚等 腾冲火山地热区的微震观测 地球物理学报 ,1986,( 6) :5 47～ 5 5 5
[2 ]叶建庆等 腾冲火山地区微震观测 (Ⅰ ) 地震研究 ,1998,2 19( 4 ) :3 4 3～ 3 4 8
[3 ]叶建庆等 腾冲火山地区微震观测 (Ⅱ ) 地震研究 ,2 0 0 0 ,2 3 ( 2 )
[4]S D Malone ,火山地震 :由圣海伦斯山得到的例子 地震 :观测理论和解释 地震出版社 ,1992 2 81～ 2 94
[5 ]秦嘉政等 腾冲火山区剪切波和尾波衰减初步研究 地震研究 ,2 0 0 0 ,2 3 ( 2 )
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