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本文对川滇地区1988年以来30次Ms≥5.0级地震前ML≥3.0级地震活动进行了分析。结果认为,中、强地震前ML≥3.0级地震活动的强度和频度曲线有一个非线性趋势增强的变化过程,曲线上升的非线性增强对整体区域一定时间段内有震、后续地震和无震的判断给出了震前地震活动的中、短期异常信息。 相似文献
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本文对川滇地区1988年以来MS>5.0级地震前后ML≥3.0级地震活动的强度和频度变化进行了分析。结果认为,主震前ML≥3.0级地震活动的强度和频度曲线有一个非线性趋势增强的变化过程,主震后ML≥3.0级地震活动的强度和频度曲线仍然保持上升的非线性增强,曲线上升的非线性增强对整个区域一定时间段内有后续地震的判断给出了短期异常信息。 相似文献
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用地震活动非均匀度CL值作参数,使用1971～2000年期间川滇地区M≥2.5级地震资料进行了GL值的空间扫描.结果表明,川滇地区72%的M≥6级地震前1～2 a,在未来震中周围均有GL值异常出现,用R值对其进行评分,可以通过检验.由典型震例图像给出了异常的主要特征. 相似文献
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通过对2010年10月24日太康ML5.0级地震前的资料进行回顾研究,认为在这次地震前,存在区域中等地震活动增强、ML≥2.0级弱震空区、弱震条带、地震平静及霍山地震后窗口高频次异常等异常图象.它又一次为该区对中等地震的监测预报积累了资料. 相似文献
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文章采用多种地震学参数的地震对应相关谱(ECRS)方法,分析研究阿拉善左旗及邻区ML≥5.0地震多种地震学参数的地震对应相关谱时空演化特征。结果表明,目标地震前多参数滑动极值平均概率时序曲线会出现高值异常;震前约1年左右,空间图像出现高值异常,接近临震异常区域会扩大增强,震后1~2年异常区域逐渐弱化消失。研究结果可为此地区中强地震危险性的判定提供科学依据。 相似文献
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川滇地区强震孕育过程中的中等地震动态演化特征 总被引：2，自引：0，他引：2
引用有关地震活动的频度面积S值方法^[1],对川滇地区1970年以来6．7级以上强震前后的中等地震活动进行研究,发现强震的S值在震前和震后的异常变化特征既有共性又有个性。共性主要表现为：在震前S值异常为高值或低值异常,震后下降或上升;对特定区域研究发现,滇西南地区强震的孕震区中等地震活动的S值震前异常主要为高值,而滇西地区强震孕震区中等地震活动的S值震前异常主要表现为低值。表明对川滇地区强震孕震区中等地震活动的频度面积S值方法的动态追踪,利用其变化规律可以为强震的预测预报提供一定的判定指标。 相似文献
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以累计频度定量计算方法，分区讨论了河南及邻区1970年以来地震活动非线性度ZL值的时间进程曲线，系统计算了M≥5．0级地震前的ZL值，结果表明：开始出现活跃(平静)异常的时间集中在地震前1—2年，结束异常的时间在地震前一年内，集中于0—4个月。同时提出了异常的定量指标以及发震类型。 相似文献
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CUI-YING ZHOU YUAN-QING ZHU HONG-WEI WANG KAI-LI LIANG PING LI AI-XIANG GUO 《地震学报(英文版)》1999,12(2):232-237
parameters integrated predictionIn current earthquake prediction, seismological method is considered the first choice. According to rough statistics, there are over 100 seismological parameters used in earthquake prediction in China. That a great number of parameters could be chosen is more convenient, but also causes a lot of troubles at the same time. It is more difficult to decide which one is better among them. In the practical key problem and the 'Eighth Five-Year Plan' key problem on short-period earthquake prediction sponsored by China Seismological Bureau, most of the parameters have been evaluated on efficiency, but it is still not easy to decide which one can be given the priority and which one should be discarded, because the adopted data, the sample numbers and the evaluation criteria were not always consistent in these researches. Therefore, the first problem which the earthquake predictors are facing is how to select the best one from so many seismological parameters. In the past, most of the parameters were used in the seismic cases, but never used in the zone where no strong earthquakes occurred, in this way it is impossible to cast away 'false abnormality'. Furthermore, as the process of seismogeny is nonlinear and complicate, the non-uniqueness and uncertainty of the development process make the seismic precursors different in time, place and earthquake, which often causes false prediction when a single parameter is used. In order to solve the problem better, this paper attempts a new method comparison screening, to select seismological single parameter and to collect a comprehensive seismological parameter on this basis. The basic procedure may be summarized as follows: on the basis of reasonable normalization of various parameters, quantitative comparison screening of some basic seismological parameters by using the two sorts of samples from 'large-magnitude seismic zone' and 'no large-magnitude seismic zone' in North China is conducted, to obtain 'seismic abnormality' and 'aseismic normality' indexes, and then to synthesize these indexes with weighting method according to the strength of the earthquake information to obtain a integrated prediction index which is universal to predict the earthquakes in North China, and meanwhile develop a new seismological prediction method which is abbreviated as SQIP (seismological quantitative integrated prediction method). 相似文献
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分析了地震活动图象和地震学预报指标研究中的“场兆”和“源兆”问题,指出：未来的震源仅仅是区域应力场中若干应力集中区之一;多数地震活动图象和地震预报指标反映的区域应力场的变化;现在已有可能从地震活动图象和地震学预报指标的综合研究,找出一个或几个应力集中区,但还没有什么指标和方法能判断哪一个应力集中区一定和何时会发生强震。由此建议,在确定若干应力集中区之后,将哪一个应力集中区将会发震的判别标志作为进一 相似文献
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GIS as a Tool for Seismological Data Processing 总被引：2，自引：0，他引：2
G. Leonard Z. Somer Y. Bartal Y. Ben Horin M. Villagran M. Joswig 《Pure and Applied Geophysics》2002,159(5):945-967
—?A computerized application of an integrated seismological GIS model is presented. An object oriented approach of the GIS topology is introduced and the special functions and features of this system are described. A network topology was selected to simulate the network characteristics of seismological data management and analysis. Each seismological entity is considered as a graphical data object, which is associated to other objects by predefined relationships. The graphical user interface introduced by GIS enables to handle seismological software routines and data in a more intuitive way. Examples of interactive processing of seismic waveforms for detecting, locating and characterizing seismic events using GIS visualization capabilities are presented. The benefits of this system during a passive seismic survey in the framework of the CTBT are highlighted. 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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Introduction Study of seismicity indexes and prediction methods is an important aspect of earthquake pre-diction research. In recent years, with more and more seismicity indexes being presented and de-veloped, a question is naturally put forward that which ones among so many seismicity indexes are dependent and which ones are independent when they are used to describe seismicity changes. The author studied the correlativities among several non-linear prediction indexes, such as capacity dimens… 相似文献
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V. N. Chebrov D. V. Droznin Yu. A. Kugaenko V. I. Levina S. L. Senyukov V. A. Sergeev Yu. V. Shevchenko V. V. Yashchuk 《Journal of Volcanology and Seismology》2013,7(1):16-36
This paper presents the main results from the development of the detailed seismological observation system in Kamchatka and the information on the system as of 2011. We describe the networks of seismological stations, the systems for the acquisition, storage, and processing of seismological observations and their technical, methodological, and software support. We discuss the basic characteristics of the recording channels and the system as a whole. We present the information resources of the Kamchatka seismological data bank that provide for basic research in earth sciences. In 2011, the system of seismological observation in Kamchatka was a specialized network for acquisition (recording), storage, transmission, and processing of seismic and geophysical data that provides support for the effective monitoring of seismic and volcanic activities, as well as tsunami warning. 相似文献
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One of the main purposes of the International Seismological Centre (ISC) is to collect, integrate and reprocess seismic bulletins provided by agencies around the world in order to produce the ISC Bulletin. This is regarded as the most comprehensive bulletin of the Earth’s seismicity, and its production is based on a unique cooperation in the seismological community that allows the ISC to complement the work of seismological agencies operating at global and/or local-regional scale. In addition, by using the seismic wave measurements provided by reporting agencies, the ISC computes, where possible, its own event locations and magnitudes such as short-period body wave m b and surface wave M S . Therefore, the ISC Bulletin contains the results of the reporting agencies as well as the ISC own solutions. Among the most used seismic event parameters listed in seismological bulletins, the event magnitude is of particular importance for characterizing a seismic event. The selection of a magnitude value (or multiple ones) for various research purposes or practical applications is not always a straightforward task for users of the ISC Bulletin and related products since a multitude of magnitude types is currently computed by seismological agencies (sometimes using different standards for the same magnitude type). Here, we describe a scheme that we intend to implement in routine ISC operations to mark the preferred magnitudes in order to help ISC users in the selection of events with magnitudes of their interest. 相似文献