地震研究

2007—2019年洱源台洞体应变及辅助硐室温度的长期观测数据中存在明显的分段特征,通过多测项数据对比、日志追踪、现场调查等方法分析查找导致数据分段的近场环境事件。结果表明:近场环境的某些细微变化能够引起形变观测数据振幅、频率、组分、稳定性的变化,导致前后数据的不一致,从而影响观测数据的稳定性。因此,必须尽可能保持近场环境恒久不变以确保观测数据的长期稳定性,从而避免前后数据可比性降低影响前兆数据在中短期地震预测中的应用价值。

In the long-term crustal deformation data and geothermal temperature data from 2007 to 2019 in the Eryuan seismic station,the segmentation characteristics are obvious.For finding the reasons which cause the segmentation,methods of multi-data comparing,daily record scanning,and field surveying are used to look for near field changes in surrounding environment.The result is given that some small changes in near field environment can lead to terrible changes of observation data in some aspects such as amplitude,frequency,composition,and stability.Then the long term data is inconsistency and instability.It is argued that the near-field environment should be kept to ensure the stability and consistency of observation data.Then the long-term data can be used in medium and short term earthquake prediction.

引言
1 观测台站及数据的基本情况
2 硐室温度与洞体应变数据的关系分析
3 结论

图1 洱源地震台各测项平面布局<br/>Fig.1 Plane layout of each observation items at the Eryuan seismic station

图1 洱源地震台各测项平面布局
Fig.1 Plane layout of each observation items at the Eryuan seismic station

图2 洱源台洞体应变NS向(a)与硐室温度(b)数据变化形态<br/>Fig.2 Data of long-term cave strain observation in NS(a)and temperature of observation tunnels(b) at the Eryuan seismic station

图2 洱源台洞体应变NS向(a)与硐室温度(b)数据变化形态
Fig.2 Data of long-term cave strain observation in NS(a)and temperature of observation tunnels(b) at the Eryuan seismic station

表1 洱源台洞体应变观测数据形态的分段特征<br/>Tab.1 Segmentation characteristics of the observation data of cave strain at the Eryuan station

表1 洱源台洞体应变观测数据形态的分段特征
Tab.1 Segmentation characteristics of the observation data of cave strain at the Eryuan station

图3 洱源台洞体应变NS向(a)与硐室温度(b)数据局部放大对比图<br/>Fig.3 Partial enlarged contrast charts between cave strain observation in NS(a)and temperature of observation tunnels(b)at the Eryuan seismic station

图3 洱源台洞体应变NS向(a)与硐室温度(b)数据局部放大对比图
Fig.3 Partial enlarged contrast charts between cave strain observation in NS(a)and temperature of observation tunnels(b)at the Eryuan seismic station

图4 洱源台洞体应变NS向与硐室温度数据的最小二乘线性拟合结果<br/>Fig.4 Results of least square fit between cave strain observation in NS(a)and temperature of observation tunnels(b)at the Eryuan seismic station

图4 洱源台洞体应变NS向与硐室温度数据的最小二乘线性拟合结果
Fig.4 Results of least square fit between cave strain observation in NS(a)and temperature of observation tunnels(b)at the Eryuan seismic station

图5 3个时段洱源硐室温度日变幅(a～c)及其对应的洞体应变数据(d～f)<br/>Fig.5 Three-stage's daily changes of temperature of observation tunnels(a～c)and their corresponding cave strain observation in NS(d～f)at the Eryuan seismic station

图5 3个时段洱源硐室温度日变幅(a～c)及其对应的洞体应变数据(d～f)
Fig.5 Three-stage's daily changes of temperature of observation tunnels(a～c)and their corresponding cave strain observation in NS(d～f)at the Eryuan seismic station

图6 洱源硐室温度数据的分段情况<br/>Fig.6 Segmentation characteristics of the temperature of observation tunnels at the Eryuan seismic station

图6 洱源硐室温度数据的分段情况
Fig.6 Segmentation characteristics of the temperature of observation tunnels at the Eryuan seismic station

图7 洞体应变NS向(a)与硐室温度(b)数据细节对比<br/>Fig.7 Data contrast between cave strain observation in NS(a)and temperature of observation tunnels (b)at the Eryuan seismic station

图7 洞体应变NS向(a)与硐室温度(b)数据细节对比
Fig.7 Data contrast between cave strain observation in NS(a)and temperature of observation tunnels (b)at the Eryuan seismic station

车用太,鱼金子.2013.井水温度观测中有待解决的若干基本问题[J].中国地震,29(3):306-315.
房艳国,李茂华,付调金,等.2015.云南大理州洱源盆地温泉分布特征及成因分析[J].资源环境与工程,29(5):701-705.
高昂.2013.山洞环境对地震观测的影响[J].地震地磁观测与研究,34(5):200-203.
哈辉.2004.20起地震监测设施和观测环境保护行政执法案例特征分析[J].高原地震,16(2):55-61.
李智蓉,付虹,高华宴.2018.云南地区定点形变观测异常特征与地震预测研究[J].地震研究,41(1):90-97.
刘耀炜,孙小龙,王世芹,等.2008.井孔水温异常与2007年宁洱6.4级地震关系分析[J].地震研究,31(4):347-353.
陆明勇,黄辅琼,周峥嵘,等.2004.地壳形变与地下水异常关系研究进展[J].大地测量与地球动力学,24(3):98-104.
孙伶俐,李明,龙涛.2014.大气环境变化对地壳形变观测的影响研究[J].地震研究,37(3):412-418.
王梅,李峰,孔向阳,等.2004.数字化形变观测干扰识别[J].大地测量与地球动力学,24(1):94-98.
张永仙,石耀霖,刘桂萍.2000.热物质上涌与震前重力异常关系初探[J].地震,20(增刊1):135-142.
周真恒,向才英,赵晋明.1995.滇西地热场特征[J].地震研究,18(1):41-48.
Flovenz O G.1986.地下温度测量在冰岛地热勘探中的应用[J].安振昌译.曾治权,欧阳珽校.地球物理学进展,(2):135-141.
DB/T8.1—2003,地震台站建设规范——地形变台站[S].

备注

引言

1 观测台站及数据的基本情况

2 硐室温度与洞体应变数据的关系分析

3 结论

期刊信息