We collected earthquakes with local magnitude above 1.0 and travel time data in Shandong area from the year 2009 to 2016,and calculated one-dimension seismic velocity model.The process mainly included three steps:1)Initial model.:to fit the travel time data and analyze the reduced travel time curve,eventually to get the initial model and its span;2) Best model:to relocate the selected events of all possible models based on Hyposat software,according to the RMS and geophysical background,to get the best model of P phase and the possible model of S phase through adding a reasonable variable to theoretical seismic velocity ratio,then to relocate events of all models according to the RMS,and finally to reveal the best model;3) Model test:to test the best model by using the test of natural earthquake event,blast event,horizontal epicenter comparison of three location methods,depth comparison of four location methods,HypoDD epicenter comparison of Rushan and Changdao earthquake clusters,and ultimately to get the best model.The one-dimension seismic velocity model in Shandongis:VP1=6.13 km/s,VP2=6.88 km/s,VP3=7.93 km/s,H1=22 km,H2=33 km,VS1=3.54 km/s,VS2 =3.95 km/s,VS3 =4.46 km/s.Besides,the location accuracy of nonlinear algorithm such as simplex generally is less dependent on the seismic velocity model;whereas the linear iterative positioning method based on the Geiger algorithm is more dependent on the seismic velocity model.

利用CAP方法(Cut and Paste Method),反演了2013年10月1日以来发生在山东乳山的地震序列中M≥3.0的9次地震震源机制解.结果显示,这9次地震的震源机制解基本一致,在震源深度分布和震中空间分布上略有差异;拟合的最佳震源深度在3.8～8.6 km的范围内,主要分布在近地表的上地壳;乳山震群的断层走向是NW向分布、倾角是NE向分布.因距已知主要断层有一定距离,故可以推断乳山地震序列区域有一条或者多条隐伏断裂.

Using the broad-band digital data,selected of L≥ 2 .0 waveform data recorded by Shan-dong digital seismic network since 2007 ,we calculated the stress values and moment magni-tude Wfor each earthquake and analyzed the correlation between them.Combinning Shan-dong geological structure and characteristics of seismic activity,wq analyzed stress field dis-tribution and its temporal and spatial variation in Jiaodong Peninsula and the northern wa-ters,the northern region of the South Yellow Sea,Yishu belt regions,Shandong and Henan border region.We also explored the regional characteristics of stress field and the relation-ship with seismic activity.

Using full waveforms recorded in regional stations(epicentral distance 1°~5°),this paper retrieved the moment tensors for 3 mid-strong earthquakes in U.S.,i.e.November 6,2011 Ms 5.6 Oklahoma earthquake,August 23,2011 Ms 5.5 Colorado earthquake,and August 23,2011 Ms 5.8 Virginia earthquake.We compared our solutions with those given by USGS from other different methods.The result showed that these solutions have good consistency with each other,and implied reliability and robustness of our method.We adopt particle swarm optimization algorithm in non-linear inversion process,therefore,we can get a fairly accurate solution in shorter time.The method discussed in this paper is adequate and can be used for earthquake countermeasures after midstrong shocks.

为了建立山东省数字地震台站场地响应数据库,选取山东区域数字地震台网自2009年4月至2012年1月记录的ML≥2.5地震事件,通过信噪比方法挑选出质量较高的86次地震,采用互相衔接的三段几何衰减模型,基于遗传算法,利用Moya等方法对山东省36个地震台站进行场地响应测算.其中35个台站未显示明显的放大作用,聊城台场地响应变化起伏较大,高频部分放大明显,烟台、招远、即墨、五连、菏泽台场地响应总体表现出一定衰减作用.

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.

地震信号检测是进行各种地震数据分析和处理的首要任务,STA/LTA方法具有算法简单、便于实时处理等特点,被广泛应用于地震信号检测.结合实际震例数据研究STA/LTA方法进行地震信号检测的各种影响因素,得到该方法进行检测时最合理的参数设置范围.

详细介绍单台地震实时监测与应用软件的设计与实现,以及各模块的功能特点.该软件系统采用了基于Morlet小波理论进行震相识别,并且将标准长短时平均能量比方法和MCWT-AIC方法相结合,实现了地震事件实时监测报警,在数据分析处理中将时频分析技术应用其中,该软件很适合在测震台站与流动台站的单台地震监测与研究工作中使用.

随着观测能力的提高和观测手段的改善,反映地球介质特性Q值的研究不断深化和发展.利用山东数字测震台网记录的数字地震波资料,采用时间域P波脉冲宽度法对2003年和2004年青岛震群进行Q值计算,对初动半周期的两种不同获取方法进行了比较,总结了P波脉冲宽度法的适用条件及计算效果,得到青岛地区和胶东地区的Q值.

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.

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.

The ground motion noise of 36 national substations of tenth five-year plan seismic network,Shandong are analyzed and computed,the velocity RMS value,availiable measure dynamic range and noise signal power spectrum of ground motion of background noise for every station are obtainned.The result shows,the Yishui station,Juxian station,Tancheng station,Xintai station,Yantai station,Rongcheng station,Cangshan station,Shanghe station,Laizhou station,Longkou station,Haiyang station,Wendeng station,Linqu station are first grade standard station,other stations accord with the request of choosing location of seismic station.

Using the data observed in seismic network of Shandong Province,a comparative study of the location parameters used in "the Tenth Five-Year Plan" system and "the Ninth Five-Year Plan" system is carried out.The result shows that the system location parameters used in"the Tenth Five-Year Plan" system and "the Ninth Five-Year Plan" system are coincident.The simplex method in "the Tenth Five-Year Plan" system is a best location method,available for all earthquakes wherever located interior,margin and exterior of network.