Basic facts about Shandong Regional Seismic Precursor Network are introduced,including its technical system and operation monitoring of observation instruments as well as data quality monitoring.Based on the actual situation of the network,experiences on operation and maintenance of the technical system and equipments are summarized.Furthermore,some suggestions to solve the existing problems are proposed.

We studied seismic waves near the P wave phase to discuss the characteristic of near and distant earthquakes.Firstly,we selected main period of initial P wave as the input element of neural network and picked up 2 ~ 6 s of initial P wave arriving time as time window of seismic wave.Secondly,we chose the right network structure and parameters and collected a large number of earthquake training data to realize the nonlinear system identification between near and distant earthquake.The results show that the predictable result of test data whose confidence reaches 100% in sample training interval can converge to identifier 0 or 1 quickly in non-sample training interval.The maximum period of near earthquake sample is 0.25 s and its prediction interval whose confidence reaches more than 80% is almost close to 0.35 s.The minimum period of distant earthquake sample is 0.9 s and its prediction interval whose confidence reaches more than 80% is 0.5 s,which shows that the model we select is proper and has good generalization ability.

应用地磁加卸载响应比方法,研究山东省各地磁台2008-2011年数字记录地磁Z分量加卸载响应比的高值异常,与山东及邻近地区ML≥4.0地震的对应关系,并总结P(Z)值映震异常的定量指标.结果表明:2008-2011年出现符合判据标准的异常15次,其中对应地震12次,漏报4次,虚报2次,对应率为80％；由于研究资料和震例有限,在利用P(Z)值无法标识中强震的时、空、强具体参数,需要与其他观测手段结合,才会取得更好的预测效果.

Support Vector Machine method is a machine leaning method based on statistica1 learning theory.It shows obvious advantages in processing small-sample,high dimensional pattern recognition,and nonlinear problems.In this paper,its classification principle and application status in seismic exploration,the oil gas reservoir prediction,magnetotelluric and earthquake monitoring are briefly reviewed,indicating that it is effective in geophysical research.Support vector machine method will be more extensive applied in geophysics as it continuously refines and improves.

根据VMware公司的虚拟机组件ESX 3.5及管理组件Virtual Center 2.5,结合现有硬件技术平台,在山东省地震局实现虚拟化技术的实际部署和应用.结果发现,将虚拟化技术应用到地震行业信息网络业务,可以提高工作效率,具有重要的实际意义.

Automatic judgment for seismic event is a vital part of the automatic location system.In this paper,combined with the actual model of digital waveform characteristics,a new method in line with the computerized operating mode is proposed.Waveform is preprocessed using the traditional STA/LTA method combined with waveform continuity and concentration of stations.It effectively ruled out the interference stations and ensure the accuracy of automatic judgment of seismic events.It is well validated in the actual operation process.

From constructing to test running,the entire process of the digital strong motion network of Shandong Province is introduced.The distribution,the index of instrumental performance and the trial operation in debugging of the fixed station installation are described in detail.Observation data during the trial operation is analyzed with typical seismic waveforms during the trial run presented.Rationalization proposals for expansion of digital strong motion network of Shandong Province are also presented.

By analyzing the geologic structure,scanning time,space of parameters,and the situation of earthquake background of Shandong Peninsula and the waters nearby Shandong Peninsula,it may be concluded Shandong Peninsula and the nearby waters have the abnormal background under which would earthquake take place around 5 magnitude.It has been forecasted that Jiaodong and the sea area of the northern(the earthquake belt of 3-4 magnitude) about 4.5 magnitude earthquake will be likely to take place.The seismic energy of Bohai Sea area release downward trend since 1969 the 7.4 magnitude earthquake happened.seismic activity is around 4 magnitude level in the nearly 20 years.The possibility that Bohai Sea more than 5 magnitude earthquake take place recently is smaller.In recent years the level of seismic activity of North Yellow Sea is more than Bohai Sea obviously.About 5 magnitude earthquake May take place possible in the next one or two years or slightly longer period of time in North Yellow Sea,the seismic activity trend of Shandong Peninsula and the northern sea area should be noted.

山东数字地震台网自主研制了一套地震自动定位软件系统,2008年5月在山东地震台网中心试运行,运行稳定.本文对该系统运行期间自动定位结果进行了统计与分析,结果表明,山东数字地震台网自动定位系统对于网内天然地震定位结果可靠,震中平均偏差4.09 km,震级偏差±0.08,平均速报用时63 s.

This article describes the structure of the SEED format and the content of each sub-block of the SEED document,provides software written in C++ language to convert SEED data to ASCII format using object-oriented programming method.

Based Atkinson(1992) method,the nonelastic attenuation in Central and Western Shandong and its adjacent areas was inversed with the digital seismic wave data recorded by 10 stations in Shandong digital seismic network from June 2004 to August 2007,and the relation of Q value with frequency we got is Q(f)=382.2·f0.443.Site response of 10 stations was inversed with Moya(2000) method,and the focal parameters of 26 earthquakes were got.The results were simply discussed.

Using the observational data of the Shandong regional digital seismographic network,the seismic waveform spectra are calculated by use of the data records of 44 earthquakes with magnitude equal to or greater than 3 in Shandong region in the period from 2004 to 2007.The seismic moment,corner frequency,stress drop,source radius of each earthquake are roughly estimated.The relations between the source parameters are discussed and the characters of the corner frequency distribution with time are analyzed.The results show the marked dependence of the seismic moment on the magnitude,the seismic moment on the corner frequency and the seismic moment on the source radius.

The research results on the determined magnitude between the Tenth fivesystem and Ninth fivesystem in Shandong digital seismic network were introduced in detail in this paper.

Based on the real-time wave data of Shandong Digital Seismic Network,the displacements of background noise of each station are calculated by using integral in frequency domain.The spatial distribution and time variation characteristic of displacements of background noise of Shandong province are obtained by a statistic analysis.The result shows that range of background noise of stations is closely related to geology environment of regions.For stations located on thick Quaternary loess deposits,such as Liaocheng and Heze,west of Shandong province, and Dezhou,northwest of Shandong province,and Dongying as well as Binzhou,east of Shandong province,whose displacements of background noise are larger than that of stations located on bedrock in the areas of center,south mountain region and Jiaozhou peninsula of Shandong province.In addition,noises in daytime is larger than that in night.The background noise,however,of stations in deep wells are relatively stable.This research provides basic data for network monitoring abilities evaluating,for field response calculating of each station and for earthquake magnitudes modifying as well as for other seismological research, helpful for improvement and development of network.

The earthquake-monitoring of Shandong digital seismic network undertakes task of large earthquake quick report and the small earthquake monitoring in Shandong and adjoin areas.With the development of national economy and the improvement of digital technology,A Jinan wireless telemetry seismic network was built during"the eighth five-year plan".During "the ninth five-year plan",the network had been rebuilt to a digital teleseismic network.During"the tenth five-year plan",after Shandong digital seismic network has been finished,station layout,monitoring capacity and reporting-earthquake-speed performance has been strengthened,and it provides a reliable technology platform for seismic studies,seismic quick-report and the earthquake emergency.

In this article,the page column design and the contents of the website of Earthquake Network Center of Shandong Province are introduced.The website's concrete function,as well as the website manufacture's technology and the method are also introduced.Visiting the website we can find a lot of information about Earthquake Network Center of Shandong Province,and are able to query all the earthquakes of magnitude larger than 2.0 and occurred in Shandong science 2002.

Based on seismic waveform data of digital seismic networks of Shandong and Qingdao,the Q-values of coda wave of the area around 4 seismic stations of Qingdao are calculated by using analysis method of wavelet package on single scattering model.The variation relationship Q-values with frequency of coda wave(Q) in Qingdao and its adjacent see area is obtained by fitting,being.Also,the Q-value for Wanggezhuang M4.0 earthquake swarm sequence in 2003 June in Qingdao city is also calculated and analyzed,indicating that the Q-values did not change much during the earthquake swarm.

In this paper,a variety of earthquake location methods are described.The principle of various methods is summarized.Our description focus on the Geiger's classical method,as well as a variety of linear methods based on that method:the earthquake location methods for single seismic event and a number of seismic events and their application,especially the domestic applications.The characteristics of the various methods are also pointed out with corresponding comparisons.