龙岗火山区尾波Q值的初步研究

doi:10.3969/j.issn.0253-4967.2011.01.011

地震地质 ›› 2011, Vol. 33 ›› Issue (1): 114-122.DOI: 10.3969/j.issn.0253-4967.2011.01.011

龙岗火山区尾波Q值的初步研究

梁国经¹, 李仲巍¹, 郑双凤¹, 刘俊清², 刘达峰¹, 綦伟¹

1. 吉林省龙岗火山监测站, 抚松 134528;
2. 吉林省地震局, 长春 130022

收稿日期:2010-04-09 修回日期:2011-01-27 出版日期:2011-04-29 发布日期:2011-12-18
作者简介:梁国经,男,1960年生,1990年毕业于吉林工业大学,现主要从事火山监测与研究工作,电话: 0439-6570555,E-mail: fslgj 0511@163.com。

PRIMARY STUDY ON CODA Q VALUE IN LONGGANG VOLCANO AREA

LIANG Guo-jing¹, LI Zhong-wei¹, ZHENG Shuang-feng¹, LIU Jun-qing², LIU Da-feng¹, QI Wei¹

1. Volcanic Observatory of Longgang, Jilin, Fusong 134528, China;
2. Earthquake Administration of Jilin Province, Changchun 130022, China

Received:2010-04-09 Revised:2011-01-27 Online:2011-04-29 Published:2011-12-18

摘要/Abstract

摘要：

基于Sato单次散射模型,利用2007年5月至2010年2月龙岗火山测震台网记录到的发生在火山区及邻近地区内的41次M_L≥1.6地震的波形资料,计算了龙岗火山区的尾波Q值,得出尾波Q值与频率的关系为Q(f)=(42.65±7.53)f^{(0.845 9±0.164 2)},具有以低Q值高η值为特征的火山构造活跃地区的尾波性质。火山区尾波Q值的空间分布显示,金龙顶子火山附近的金川台尾波Q₀值为31.98,明显低于其它台站。结合深地震探测和垂直形变资料成果,佐证了龙岗火山岩浆囊的位置可能在金龙顶子火山附近。

关键词: 尾波Q值, Sato模型, 龙岗火山

Abstract:

According to Sato(1977)single scattering model and using 41 earthquakes with M_L≥1.6 in the Longgang volcano and the nearby regions recorded by Longgang volcano digital seismic network from 2007 to February 2010,the coda Q value in the Longgang volcanic region was determined.All of events used in this paper occurred at depths from 6 to 10km,with the epicentral distances less than 75km.The results show that the coda Q has a dependence with frequency as Q(f)=(41.65±11.74)f^{(0.845 9±0.164 2)},which is characteristic of coda in active volcanic regions as low Q value and high η value.Compared to other volcanic areas in the world,the average Q_c of the Longgang volcanic area is obviously lower.Distribution of coda Q value on Longgang volcano shows that coda Q₀ value at Jinchuan seismic station near Jinlongdingzi volcano is 31.98,significantly lower than other stations’,which,in combination with the deep seismic sounding data and vertical deformation data,proves that the magma chambers probably locate in the vicinity of Jinlongdingzi volcano.For the lower coda Q₀ value,we interpret the strong attenuation of coda waves near the Longgang volcano is possibly related to high temperature medium caused by magma chambers.

Key words: coda Q value, Sato model, Longgang volcano

中图分类号:

P315.3⁺1

梁国经, 李仲巍, 郑双凤, 刘俊清, 刘达峰, 綦伟. 龙岗火山区尾波Q值的初步研究[J]. 地震地质, 2011, 33(1): 114-122.

LIANG Guo-jing, LI Zhong-wei, ZHENG Shuang-feng, LIU Jun-qing, LIU Da-feng, QI Wei. PRIMARY STUDY ON CODA Q VALUE IN LONGGANG VOLCANO AREA[J]. SEISMOLOGY AND GEOLOGY, 2011, 33(1): 114-122.

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龙岗火山区尾波Q值的初步研究

PRIMARY STUDY ON CODA Q VALUE IN LONGGANG VOLCANO AREA

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