| 对流层大气甲烷浓度对地震活动的响应 |
| |
| 引用本文： | 王杰,李献瑞,贺赤诚,曾佐勋.对流层大气甲烷浓度对地震活动的响应[J].地球科学,2015,40(10):1677-1688. |
| |
| 作者姓名： | 王杰 李献瑞 贺赤诚 曾佐勋 |
| |
| 作者单位： | 1.中国地震局地震研究所地震大地测量重点实验室, 湖北武汉 430071 |
| |
| 基金项目： | 中国地震局"三结合"课题151701教育部三峡库区地质灾害研究中心开放基金TGRC201004 |
| |
| 摘 要： | 根据气候要素的特征周期, 利用小波分析方法, 从大气对流层甲烷体积混合比产品中分解、识别并去除气候和人为因素对应甲烷浓度变化分量, 从而提取出地质活动所引起的甲烷异常幅值变化信息.在此基础上, 以龙门山和玉树地区为例, 研究了甲烷异常幅值与地震活动间的关系.研究表明: 甲烷异常幅值与地震活动存在明显的对应关系; 龙门山地区3年间(2004—2006年)共出现甲烷异常峰值13次, 玉树地区2年间(2004—2005年)共出现14次; 其中21次(78%)甲烷异常峰值与地震峰值出现的时间间隔不超过2个月; 两个研究区的间隔天数随时间演化非常同步, 均呈现先降后升的规律; 龙门山地区异常增幅与地震能量峰值存在明显的正相关关系, 而玉树地区则不存在.最后, 初步探讨了甲烷异常产生和变化的原因, 认为地源甲烷来源于壳-幔流体的上涌; 其值的波动与韧性流变层中地质流体的存储状态及中上地壳"微破裂"、"破裂链"的发育过程有密切关系.
|
| 关 键 词： | 甲烷 地震 对流层 龙门山 |
| 收稿时间： | 2015-03-11 |
Methane Concentration Responses Associated with the Seismic Activity in Atmospheric Troposphere |
| |
| Abstract: | According to the characteristic periods of climate elements, component signals caused by climate and human factors are decomposed and recognized from the volume mixing ratio of methane in the troposphere, using wavelet analysis method. And then, extract the variation of methane concentration signal caused by geological activity (geological methane). On this basis, analyze the relationship between the variation of geological methane concentration and seismic activity, take Longmenshan and Yushu areas for examples. The result shows that there is an obviously corresponding relationship between the variation of geological methane concentration and seismic activity. In addition, 13 peak values of geological methane concentration occurrence in Longmenshan area in 2004—2006, and 14 peaks values occurrence in Yushu area in 2004—2005. In total, 21 cases (78%) of the time difference of geological methane and seismic activity peak are less than 2 months, and the time difference decrease firstly and then increase in February 2005, in these two areas. And, there is a positive correlation between geological methane concentration and seismic activity peak values in Longmenshan area. Finally, preliminary study on the source and variation of geological methane, the results indicate that geological methane comes from upwelling of mantle and crust fluids, and its concentration correlated closely with the temperature and pressure of ductile rheological layer and "microcracks" and "Rupture chain" in mid-upper crust. |
| |
| Keywords: | |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
| 点击此处可从《地球科学》浏览原始摘要信息 |
| 点击此处可从《地球科学》下载免费的PDF全文 |
|
