共查询到19条相似文献，搜索用时 640 毫秒
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中国的地震台阵建设与发展比国外晚了几十年.目前国内地震台阵正在不断地建设,而缺少的就是台阵技术,如能够把已有的台阵技术应用到我国的台阵中,就可以让台阵发挥它们应有的价值.作者根据国外的参考文献主要讨论了台阵地震学的主要技术方法并把这些方法应用到中国的IMS台阵,并给出了应用实例.结果表明,地震台阵使我们对地下结构的研究更加精细,使我们对微弱信号的识别更加轻松.如果我国现有台阵都能应用台阵地震学技术将对我国地震学和地球物理学的发展起到很大的推动作用. 相似文献
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自60年代初期将地震台阵的方法和技术用于检测微弱地震及侦查地下核试验的地震信号以来,利用地震台阵技术和方法所开展的地震学研究及地下核试验侦查等方面的工作都取得了较大的进展。多年来,台阵观测实践和结果也说明了地震学方法是侦查地下核试验的主要方法,地震台阵则是地震观测的主要手段之一。 相似文献
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地震台阵的历史起始于 50年代未 ,当时其目标主要是检测、区别核爆炸信号和地震信号 .地震台阵研究包括地震台阵技术研究和地球物理学中应用研究 .其中台阵技术研究可以分为台阵建设和数据处理方法研究两大部分 (Anne,1 990 ) ,地震台阵理论研究的发展可涉及到地球物理学领域的许多科学问题(Tormod,1 989;Mykkeltveit,Bungum,1 984) .台阵主要用于监测微弱事件 ,而台阵的响应特性是衡量台阵对微弱事件监测能力的一个很重要标志 ,因此 ,不论是考察一个台阵 ,还是要着手建立一个台阵 ,必做的内容之一就是计算台阵的响应特性(Harjes,1 990 ) … 相似文献
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地震台阵的历史起始于５０年代末,当时其目标主要是检测核爆炸产生的地振动信号与鉴别爆炸信号和地震信号,我国地震学家在７０年代也曾对台阵作初步研究,在台阵的寻展过程中,许多新技术被引起用于信号处理,数据分析和解释,本文主要介绍频率扫描聚束及视速度扫描聚束在台阵数据处理的应用,并使用该技术在上海地震台阵选址中的具体实现。 相似文献
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根据各大网站地震目录和前人研究成果,分析全球地震台网与地震台阵、我国区域台网与地震台阵的监测能力,阐述了地震台阵与密集台网/台阵的区别。研究表明,对同一地区所检测的地震数,地震台阵是地震台网的3-10倍,而震级下限可降低1.2-2级。一般情况下,以微弱信号检测为目的的地震台阵监测能力均优于以结构研究为目的的密集台网/台阵,2种台阵是目的、性质、孔径、形状、台间距、技术手段、研究方法均不同的监测系统。 相似文献
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地震台阵是为了监测核爆而发展起来的一种地震观测系统。近年来,地震台阵被推广到地球内部速度间断面的研究中并极大地推动了地震学的发展。本文主要介绍处理台阵资料的技术方法,如聚束、倾斜叠加、N次根叠加、频率波数法以及相位加权叠加等,并讨论各种方法的优缺点。在提取微弱但相关信号方面,重点讨论相位加权叠加方法及现有的研究成果。结果表明,这些方法都在不同程度上提高了记录的信噪比,高质量的台阵数据使得地球内部速度结构的成像研究更加精细。 相似文献
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根据汶川地震序列,选出距离合适、波形相关性较好的事件作为震源阵,联合永久台阵(那曲、和田台阵),进行震源阵与固定台阵组合研究,计算其台阵响应.结果表明,地震序列可以形成震源阵,按照地震台阵的特殊方法进行研究,可以提高信噪比,为揭示地下精细结构提供条件. 相似文献
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Improving Seismic Resolution Through Array Processing Techniques 总被引：4，自引：0，他引：4
Seismic arrays, first introduced in the late 1950s to detect underground nuclear explosions, have helped to improve our knowledge about the structure of the Earth for the last 40 years. During these years, numerous array processing methods have been developed that use the high signal coherence and accurate timing of array data to generate high-resolution images of Earth structure. Here, we present an overview of resolution issues related to seismic array studies of Earth structure by first introducing basic array processing techniques and then discussing more advanced techniques applied to array data recently. The increase of seismic stations deployed in experiments or permanently in many regions of the globe allows a much denser sampling of the seismic wavefield. This dense sampling enables the adaptation of controlled source analysis techniques for the study of Earth structure using earthquakes with higher resolution than previously possible. Here we will discuss different migration methods of teleseismic data that use the incidence angle information of scattered arrivals to obtain images of Earth structure. Finally, we show data examples how these methods can be used to increase our knowledge of the structure of the Earth’s deep interior. 相似文献
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国家数字地震台网中心应用地震波形数据格式及转换 总被引：2，自引：0，他引：2
SAC是广泛应用于地震学分析研究中的工具软件, SAC格式也成为地震波形数据的通用格式。国家数字地震台网中心向用户提供47个国家数字地震台站该格式的事件波形资料。文中详细介绍数据格式的结构、特点和内容,并给出格式转换的流程及程序实现。最后给出某些地震事件的波形及头段变量内容。 相似文献
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地震发生时的动态应变场,在研究地震触发、地震破裂、地面破坏、水文和岩浆变化等方面都具有重要应用意义.地震的应变张量观测和现有的惯性地震仪观测的物理量不同.前者可以直接记录到地震发生时震源辐射的应变(应力)波,而后者记录到的是位移、速度或加速度.地震频率的应变测量在地震学中的应用前景主要表现在:①测量震源机制解理论预言的辐射4象限分布;②测量库仑应力变化;③换算成动态应力以评估地震烈度;④测量地震波的能量密度;⑤测量地震断层形变加速和形变局部化过程.用惯性地震仪的记录虽然在理论上也可以解算出动态应变值,然而种种原因导致计算结果的误差很大,往往不可接受.应变张量地震仪若能与现有的惯性地震仪配套起来,形成大规模台阵,则有可能推动应变地震学的诞生,在地震观测和地震学科领域引起重大革新. 相似文献
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M. A. Nesterkina S. I. Sergeev I. A. Sanina N. L. Konstantinovskaya T. V. Danilova K. S. Sergeev 《Seismic Instruments》2018,54(4):408-416
A large number of events with sources in the immediate vicinity of an array are usually detected during seismological observations with seismic arrays. These events should be detected and correctly interpreted during processing of seismic array records in order to avoid clogging up the event catalog. This problem can be solved by classifying records of local events by genetic features and creating a databank with the most representative samples. The present paper considers local events recorded using a unique scientific setup, the Mikhnevo small aperture seismic array. Epicenters of local seismic events are located less than 5 km from the center of the array. Seismic responses of acoustic shock waves are also examined. Seismic events caused by anthropogenic sources are identified and classified using cluster, cross-correlation, and wavelet analysis. Events accompanied only by the arrival of surface waves, as well as events represented by body, surface, and acoustic waves, are identified. Shock wave events are classified as a separate category. A small group of supposedly natural weak events is also found. As a result, a databank of waveforms of local seismic events for the Mikhnevo seismic array is established. In the future, this will make it possible to automate their identification when investigating the seismicity of the East European Platform. 相似文献
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I. A. Sanina S. G. Volosov O. A. Chernykh V. E. Asming A. M. Soldatenkov O. Yu. Riznichenko 《Seismic Instruments》2008,44(1):1-11
The design of a 2D small aperture seismic array (SASA) installed in the central part of the East European Platform (in the area of the village of Mikhnevo, Moscow Oblast’) is discussed. Brief information is provided on the geologic structure of the upper section. The SASA configuration is described along with parameters of the seismological instrumentation used, and the digital seismic data acquisition system. Results are described from a study of the spectral content and the spatial correlation properties of short period microseismic noise and seismic signal coherence. Examples are provided of records of natural and manmade seismic events occurring at different epicentral distances. Experimental data are analyzed to show that this small aperture seismic array can be an effective tool to study low magnitude seismicity in the East European Platform and for solving several other problems arising in contemporary experimental seismology. 相似文献
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Repeating airgun sources are eco-friendly sources for monitoring the changes in the physical properties of subsurface mediums, but their signals decay quickly and are buried in the noises soon after traveling short distances. Stacking waveforms from different airgun shots recorded by a single seismic station (shot stacking) is the most popular technique to detect weak signals from noisy backgrounds, and has been widely used to process the data of Fixed Airgun Signal Transmission Stations (FASTS) in China. However, shot stacking sacrifices the time resolution in monitoring to recover a qualified airgun signal by stacking many shots at distance stations, and also suffers from persistent local noises. In this paper, we carried out several small-aperture seismic array experiments around the Binchuan FAST Station (BCFASTS) in Yunnan Province,China, and applied the array technique to improve airgun signal detection. The results show that seismic array processing combining with shot stacking can suppress seismic noises more efficiently, and provide better signal-to-noise ratio (SNR) and coherent airgun signals with less airgun shots. This work suggests that the array technique is a feasible and promising tool in FAST to increase the time resolution and reduce noise interference on routine monitoring. 相似文献