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《地震地磁观测与研究》2016,(4)
对北京国家地球观象台2008年1月—2014年12月地震前兆观测手段地磁、形变和重力干扰,从环境干扰、人为干扰和其他干扰,对观测产生干扰原因、干扰记录特征进行分析,并对各项干扰及时采取合理、有效的解决措施,提高地震前兆资料的使用价值。 相似文献
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前兆观测的方波型异常图像成因分析 总被引:1,自引:0,他引:1
《山西地震》2015,(4)
文章对前兆观测中记录到的方波型异常图像从仪器标定、环境干扰、高压直流干扰、人为干扰、震兆异常等方面进行成因分析,根据不同成因提出干扰方波资料的处理方法和相应的预防措施,对前兆观测数据预处理及异常判定有一定的参考意义。 相似文献
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山东形变固体潮数字化资料的干扰因素分析 总被引:2,自引:0,他引:2
利用山东省数字化形变观测记录到的固体潮资料,分析了气压、雷电、洞室装修、仪器故障及环境等干扰因素对数字化形变固体潮记录的影响,总结了1次地震前的异常特征,为利用数字化资料及时识别干扰、准确捕捉短临地震异常提供了可参考的实例。 相似文献
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新疆数字地震台站观测动态范围和台基噪声的分析 总被引:2,自引:0,他引:2
介绍了新疆数字地震台仪器的配置,对新疆23个数字地震台站台基噪声进行分析计算。台站的观测动态范围,反映了观测仪器本身的性能和台基环境干扰背景的水平,有效动态范围大小反映记录地震信号的最大能力。台站(台网)的监测能力不仅取决于仪器的性能,而且还与台基的噪声背景有关。得出了各地震台台基的脉动噪声的均方根值、观测动态范围、地噪声功率谱。有效观测动态范围的大小与数字地震仪的种类和配置有关。新疆23个数字地震台中的21个台的台基地动噪声在1~20 Hz内符合中国数字测震台网技术规程的要求,而另外2个台,即二宫和石河子数字地震台没有达到规定指标。 相似文献
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IntroductionThe present-day digital seismic observation technique provides us a large amount of accurate seismic records of high-precision, wide-band, and large dynamic range and conditions for higher-solution and higher-speed discrimination of earthquakes. But the problem we face is how to use the modern theory and method for digital signal processing in fast and precise extraction of the characteristic parameters from the large amount of digital seismic records. A basis or the important prob… 相似文献
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数字地震观测中的线性和最小相位滤波 总被引:4,自引:0,他引:4
线性相位滤波和最小相位滤波是数字地震观测中经常都要遇到的两类滤波器。现代地震数据采集器中就预置有这两种滤波系数供用户选用。本文以EDAS—C24地震数据采集器为例,通过比较两者滤波特性的差异后得出:为什么在以震相判读分析为主要用途的数字地震观测中必须选用最小相位滤波器,最好不要使用线性相位滤波器。同时还指出,最小相位滤波对优势频谱较高的地方微震波形影响较大,且振荡尾巴较长,分析研究时应注意其影响。 相似文献
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V. V. Gravirov 《Seismic Instruments》2010,46(1):13-20
The true or full ground motion information is frequently necessary in seismology to deal with a wide range of urgent scientific
and applied problems; this information includes knowledge not only of ground motion along three axes at the recording site,
but also the values of tilt or rotations of the surface at the site. This problem is usually attacked using a special type
of seismic instrument-tiltmeters. Gyrotiltmeter is one of the many types of tiltmeters in which the gyroscope is used as the
active sensor. The main obstacle in the way of developing effective long period seismic instruments, including gyrotiltmeters,
consists in various sorts of noise, frequently not of seismic origin, which influence on the instrument increases as its frequency
characteristic is extended toward longer periods. The present paper is concerned with problems arising in the use of optimal
filters to detect seismic signals in records of a gyrotiltmeter where also noise may be present, e.g., that due to air pressure
fluctuations. Examples are provided of tests of the algorithms, which clearly demonstrate that the application of the optimal
filters to records of long period gyrotiltmeter channels can significantly enhance the signal/noise ratio to detect seismic
signals disguised by induced noise. 相似文献
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数字地震观测报告是计算视应力等重要参数的基础性资料。JOPENS数据服务可提供地震目录,为使用ESSA软件计算视应力等参数提供了前提,但ESSA与JOPENS数据服务没有程序接口,需要从JOPENS数据服务网站手工下载地震目录并按需求人工筛选数据编制成数字地震观测报告。针对手工编制数字地震观测报告效率低且容易出错的问题,利用MATLAB开发出一套程序,对数字地震观测报告的编制实现了自动化处理,大大提高了工作效率,降低了出错率,能够更好地为地震分析预报工作提供数据服务。 相似文献
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The DIMAS program is designed for detailed processing and visual analysis of digital seismic signals from digital seismic
stations. It is specially designed for users whose task is to quickly determine the parameters of an earthquake from one or
a group of seismic stations in the system of seismic monitoring and tsunami warning services. The program allows for a variety
of operations with seismic signals in the temporal and spectral ranges. It has a simple and functional user interface. 相似文献