地震地质 ›› 2003, Vol. 25 ›› Issue (s1): 138-146.DOI: ISSN:0253-4967.0.2003-S1-015

• 科研简报 • 上一篇    

2002年腾冲火山区微震观测

  

  1. 云南省地震局|云南省地震局 昆明
  • 出版日期:2003-12-31 发布日期:2009-10-28
  • 基金资助:

    科技部社会公益研究专项资金 (2 0 0 1DIA10 0 0 3)资助

OBSERVATION OF MICROEARTHQUAKES IN TENCHONG VOLCANIC AREA IN 2002

  • Online:2003-12-31 Published:2009-10-28

摘要:

20 0 2年 6月 13日至 9月 13日腾冲火山区流动数字化地震台网记录了腾冲火山区及周边地区的 2 92次地震事件。对资料的初步分析表明 ,在本次观测期间 ,腾冲火山区南部地区火山地震活动仍然频繁 ,以微震为主。选用发生在火山区的 33个地震震源参数计算得出的拐角频率为 4 37~11 87Hz、应力降为 0 0 0 5~ 0 2 77MPa ,显示该区域尚属低应力分布区。S波湮灭图像的再次出现 ,充分表明在腾冲县城西南至热海的马鞍山火山、老龟坡火山一带有岩浆囊熔融体存在的可能 ,深度不超过 10km。文中还展示了台网记录到的S波湮灭、微破裂高频地震、波形特征类似火山颤动 (包络型事件 )的图像

关键词: 微震观测, S波湮灭, 岩浆囊, 腾冲火山区

Abstract:

This paper introduces the results of micro-earthquake observation by digital mobile seismic observation network disposed in Tengchong volcanic area during the period from June 6 to September 13, 2002. During the observation, 292 seismic events occurred in Tengchong and its peripheral areas had been recorded. The analysis of the obtained data shows that the volcanic earthquake activity in the southern part of Tencgchong volcanic area is still very frequent, appearing mainly as micro-earthquake. Based on th

Key words: mico-earthquake observation, S wave annihilation, magma pocket, Tengchong volcanic area