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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。 相似文献
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对临汾地震台钻孔体应变仪观测资料从数据完整率、年零漂、观测精度、噪声水平、典型干扰等方面进行系统分析,结果发现:仪器正常情况下,观测资料完整性、精度、稳定性均符合观测规范技术要求。最近几年,在每年6-9月出现的数据大幅度阶变及高频抖动畸变疑与雷雨季节、仪器老化、传感器故障有关。 相似文献
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杨绍富 《地震地磁观测与研究》2018,39(2):132-140
对库尔勒地震台的巴伦台、库米什、小泉沟子台3套四分量钻孔应变仪观测数据进行多角度可靠性分析,除按常规由4个元件的读数计算2个面应变数值及相关系数值(数据自检)外,做以下补充:对潮汐因子内精度进行计算;通过相对标定元件格值,视矫正幅度大小及对数据自检效果进行改进;与同一时段相邻区域陆态网络形变观测资料进行对比,进一步论证观测资料的可靠性。结果表明,3个子台的应变观测数据可靠,能够真实反映所处区域的构造活动和应变,可以用于区域地震预测和地震科学研究。 相似文献
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根据地震监测台站台址勘选的相关规范,结合工作经验、新疆实际情况以及各类在用测震台站的工作状况,从台址勘选4个阶段所包含的供电、通信、数据传输、台基背景噪声水平测试等不同角度,针对新疆地区不同的地理环境,经过综合分析,总结出新疆测震台站台址勘选需要满足的一些条件和需要注意的事项。 相似文献
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China is one of the earliest countries to start borehole strain observation aiming to predicting earthquake.YRY-4 and other borehole strain instruments developed by China have reached the world advanced level,with a resolution of 10-10 and can work stably.In order to capture the tectonic stress signals and analyze the relationship with seismicity,it is firstly necessary to identify and exclude the non-structure stress signals (caused e.g.by rainfall,pressure change,groundwater level fluctuation,river fluctuation etc).Annual strain change signals have been observed by YRY-4 borehole strain instrument at some stations (e.g.Guzan station in Dadu River valley).The signal is on the wave crest in spring and trough in autumn.Up to now,no relative papers have interpreted the physical mechanism causing such strain signals.In this paper,we manage to explain the physical mechanism by using numerical simulation.Considering the terrain factor of Dadu River valley,we set up a 3D finite-lement thermoelastic coupling model to compute the heat stress caused by annual change of surface temperature.The computing results are in good accordance with observation values,which illustrates that the annual change of strain signals is caused by annual change of surface temperature.We suggest that high-resolution borehole strain instrument (e.g.YRY-4 strain instrument) should avoid installing in a terribly undulate area,but choose a flat one.Although the strain signal with an annual change is a noise signal,to a certain extent,the signal illustrates that the current borehole strain instrument has a high resolution.This gives us more confidence to use this instrument to measure the structural strain. 相似文献
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针对湟源地震台钻孔应变观测数据的实际情况,并根据本台仪器所处环境,受干扰情况,运用连续小波变换、二进小波变换、离散小波变换,多分辨分析、Symlets分解与重构算法等方法,对湟源地震台钻孔应变数据进行分析研究,结果表明该方法能够有效地将数据变化、突跳和地震同震效应从原数据中突显出来,并且能够根据不同的需要突显出有用的信息,更好地为地震预报服务。 相似文献
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