介绍了丽江地震台新台址勘选过程。使用GL-PS2型一体化地震计进行测点勘选工作,计算分析了2021年12月28日13时至30日12时连续48 h内的地脉动速度均方根值(RMS)和噪声功率谱密度,并对该时段内记录到的天然地震事件进行分析。结果表明,记录到的4次天然地震事件震相清晰易识,拟选台址背景噪声达到Ⅰ类台基噪声水平。综合分析认为,该拟选台址观测环境较好,符合地震台建设要求。
This paper introduces the exploration and selection process of new station site of Lijiang Seismic Station. The GL-PS2 integrated seismometer was used to carry out the site selection survey. The Root Mean Square (RMS) of background noise and power spectrum density of 48 continuous hours from 13:00 on Dec 28 to 12:00 on Dec 30, 2021 were calculated, and the natural seismic events recorded in this period were analyzed. The results show that the seismic phases of the four recorded natural earthquake events are clear and easy to recognize, and the background noise level of the station base of the proposed site has arrived at "Ⅰ-class station base level". Comprehensive analysis shows that the observation environment of the proposed site is fine and meets the requirements of seismic array construction.
2022,43(4): 73-79 收稿日期:2022-01-28
DOI:10.3969/j.issn.1003-3246.2022.04.010
作者简介:匡泳庄(1994—),女,助理工程师,主要从事地震监测工作。E-mail:1157222305@qq.com
参考文献:
[1] 丁世念, 魏贵春, 商国利, 等. 英山数字地震台的勘选及建设[J]. 大地测量与地球动力学, 2011, 31(Z1): 68-71.
[2] 黄义忠. 丽江市地质环境脆弱性及其对策研究[D]. 昆明: 昆明理工大学, 2010.
[3] 杨跃文, 杨星, 任佳, 等. 丽江地震台中强地震前兆波特征分析[J]. 地震地磁观测与研究, 2010, 31(5): 132-137.
[4] 云南省地质调查院区域地质调查所. 1∶25万福贡县幅(G47C002002), 丽江市幅(G47C002003)地质图和区域地质调查报告[EB/OL]. 应急管理部国家自然灾害研究院, 2008.
[5] 中国地震局. GB/T 19531.1—2004地震台站观测环境技术要求 第1部分: 测震[S]. 北京: 中国标准出版社, 2004.