共查询到20条相似文献，搜索用时 110 毫秒
1.
2.
3.
4.
5.
分析了地震观测环境对地震台地震记录的影响,论述了地震观测环境对地震台地震记录的重要性.为确保地震台记录的安全可靠,提出了相应的对策. 相似文献
6.
7.
保护地震监测环境与经济建设快速发展的思考 总被引：1，自引：0，他引：1
随着经济的发展,地震观测环境受到的干扰越来越严重。本文阐述了山东地区地震监测环境的现状,引述了山东省在经济建设中地震监测环境受到影响和破坏的实例,分析了产生的原因,结合山东省地震监测环境保护的实例探讨依法保护的意义,通过郯城地震台等监测环境保护实践活动,认识到法律、法规是地震监测环境得到保护的重要保障;阐述了依靠当地政府及其管理部门共同做好地震监测环境保护工作的必要性,并认为,应从加强县级地震机构建设及合理规划地震监测台网等方面入手,加强对地震监测环境的保护。进而提出了实现经济建设发展和保护地震监测环境矛盾统一的构想。地震台站工作人员要加强法律、法规的学习和运用,担负起地震台站监测环境保护的任务。同时,针对遇到的问题,提出了一些工作对策和建议。 相似文献
8.
9.
王海云 《地震地磁观测与研究》2005,(Z1)
结合实际工作和第3次全国地震台长培训班,谈一些在新时期建设好基准台的几点思考。随着地震观测从模拟技术到数字化技术的重大变革,新的观测技术要求台站观测人员具有复合型的知识结构。同时我们必须对基准地震台监测、预测、科研三结合的内容有新的认识和把握。因此,要重视人员的培训和人才的培养。对于台站的基础建设应该与观测技术、社会经济的发展相适应。 相似文献
10.
德国地震监测系统简介 总被引：1，自引：1，他引：0
1 德国地震监测系统德国的地震监测工作由德国联邦地学与自然资源研究院(BGR)负责,具体工作由格拉芬堡地震台阵(GRF)、德国区域地震台网(GRSN)、格拉芬堡地震观测中心(SZGRF)和试验地震观测台阵(GERESS)完成。图1 格拉芬堡地震台阵和德国区域地震台网台站分布格拉芬堡地... 相似文献
11.
A trend increase in apparent resistivity has been observed in the N30°E monitoring direction at Garze Seismic Station since July 2011. This increase trend in geo-electric resistivity has been observed in the N60°W direction since 2012. During the period of the increase, the national highway No.317 was expanded in the monitoring area, so the potential electrodes in the N30°E direction had to be moved 10m towards the current electrodes. We interpreted the electric sounding data of Garz6 Seismic Station with a horizontally layered model. Analysis based on this model showed that the shift of potential electrodes can cause a 4 l-l.m rise to the measurements in the N30°E direction. Therefore, apparent resistivity of the two directions increased in the same time in 2012 after offsetting the effects from electrodes shift. Sensitivity coefficients of the two observation directions were also obtained using the model. Sensitivity coefficients of both directions were negative for the shallow layers, which can well explain the unexpected annual variations of Garze Seismic Station. In order to quantitatively analyze the effects from the expansion of the national highway on the observation, we constructed a finite element model based on the electrical structure. Analysis results also suggested that the expansion of the national highway could only cause a 0. 15 Ω·m decrease in the N60°W monitoring direction and 0. 1 Ω· m increase in the N30°E direction. Additionally, the valley values of annual variation of 2013 were distinctively higher than that of other years since 2008, meaning that there was an abnormal rise in apparent resistivity in the two observation directions at Garz~ Seismic Station before the Lushan earthquake. However, the rise was contrary to the decline variation before the Wenchuan earthquake. Therefore, it is still unsure whether or not the rise variation is related to the Lushan earthquake. 相似文献
12.
In view of the correlation between tectonic activity and seismicity, the strong earthquake risk in the North-South Seismic Belt aroused wide concern after the 2014 Yutian Ms7. 3 earthquake. Using the seismic catalog of the China Earthquake Networks Center, the Benioff strain ratio in the North-South Seismic Belt is calculated in 30 days before and after the March 21, 2008 and February 12, 2014 Yutian Ms7. 3 earthquakes. Results show that in a year after the 2008 Yutian Ms7. 3 earthquake, M 〉 5. 0 earthquakes all occurred near the high strain ratio area or the junction between the low and high strain ratio areas, the activity of strong earthquakes obviously coincides with the high strain ratio area, which indicates that these areas have a higher stress level. The Yutian earthquakes promoted the release of small earthquakes in the high stress areas. This research is of certain indicating significance to the study of subsequent strong earthquakes of this region. 相似文献
13.
The paper begins with a brief review of the research history of earthquake size measurement. On this basis, the author pointed out the following points： ① In recent decades, ML, mb （mH ）, Ms magnitude scales are widely used as measures of earthquake size. However, these magnitude scales have a deficiency of ＂overgeneralization＂ and ＂magnitude saturation＂. Moreover, since they do not fully take into account the regional difference of seismic attenuation, especially the difference of site effects on the amplification of ground motion, these magnitude scales are but inaccurate measures of earthquake size. ② Seismic moment M0 not only has clear physical meaning, but also overcomes the deficiencies existing in ML, mb （mB ） and Ms magnitude scales, so it is the most suitable physical quantity for measuring earthquake size scientifically. In order to continue to use the term ＂magnitude＂, Kanamori defined the moment magnitude scale Act. Although its prerequisite assumptions remain to be studied, it is still a reasonable scale used as a measure of the relative size of an earthquake. ③ For measuring the earthquake size more scientifically, we must make full use of a large amount of waveform data from modern regional digital seismograph networks, strengthen the research on seismic wave attenuation characteristics, site effect, calculation of source parameters and the related scaling relations. In improving the measurement methods for ML, mb （mB ） and Ms magnitude, we should focus on the improvement of Mw scale and carry forward the work as gradually taking Mw magnitude scale as the uniform physical quantity to measure the relative size of earthquakes, so as to lay a more solid foundation for research in earthquake science and earthquake prediction. 相似文献
14.
An Ms7. 3 earthquake occurred on February 12, 2014 in Yutian County, Xinjiang Uygur Autonomous Region, which was followed by a series of aftershocks. This paper calculates the depth of the Ms7. 3 earthquake sequence by using the deterministic approach with the seismic phase data from the catalog database of the China Earthquake Networks Center, combined with original seismic wave records from the Digital Seismic Network Center of the Earthquake Administration of Xinjiang Uygur Autonomous Region. 相似文献
15.
0 引言
我国的地震专业队伍是从1966年的河北邢台地震以后,在敬爱的周恩来总理的亲自关怀下建立起来的。40多年来,地震专业队伍从小到大,从群测群防到规范化、现代化,走过了一条漫长的道路。只是迄今地震预报难关尚未攻克,我们还不能从大量的观测资料中区分出哪些是地震前兆,哪些是干扰因素,只好留待以后科学进步了,再来分析利用这些观测数据。这就需要我们进一步做好地震档案工作,好好保存这些宝贵的地震档案。 相似文献
16.
17.
In 1997 - 2003, 27 earthquakes with M≥ 5.0 occurred in the Jiashi-Bachu area of Xinjiang. It was a rare strong earthquake swarm activity. The earthquake swarm has three time segments of activity with different magnitudes in the years 1997, 1998 and 2003. In different time segments, the seismic activity showed strengthenin-qguiet changes in various degrees before earthquakes with M ≥ 5.0. In order to delimitate effectively the precursory meaning of the clustering （strengthening） quiet change in sequence and to seek the time criterion for impending prediction, the nonlinear characteristics of seismic activity have been used to analyze the time structure characteristics of the earthquake swarm sequence, and further to forecast the development tendency of earthquake sequences in the future. Using the sequence catalogue recorded by the Kashi Station, and taking the earthquakes with Ms≥ 5.0 in the sequence as the starting point and the next earthquake with Ms = 5.0 as the end, statistical analysis has been performed on the time structure relations of the earthquake sequence in different stages. The main results are as follows： （1） Before the major earthquakes with M ≥ 5.0 in the swarm sequence, the time variation coefficient （δ-value） has abnormal demonstrations to different degrees. （2） Within 10 days after δ= 1, occurrence of earthquakes with M ≥ 5.0 in the swarm is very possible. （3） The time variation coefficient has three types of change. （4） The change process before earthquakes with M5.0 is similar to that before earthquakes with M6.0, with little difference in the threshold value. In the earthquake swarm sequence, it is difficult to delimitate accurately the attribute of the current sequences （foreshock or aftershock sequence） and to judge the magnitude of the follow-up earthquake by δ-value. We can only make the judgment that earthquakes with M5.0 are likely to occur in the sequence. （5） The critical clustering characteristics of the sequence are hierarchical. Onl 相似文献
18.
In this paper, using the 1999 ~ 2007 GPS velocity field data, and by choosing the optimal block model, we obtained the deformation models applicable to the boundary zones of major blocks and the slip rates of block boundary faults on the mid-southern segment of the North-South Seismic Belt. The results show that： on the Longmenshan fault zone, the tensional and compressive slip rate is small on the Baoxing-Wenchuan segment, about 0. 5 ~ 1.8mm·a^-1, and the rate is relatively significant on the segment of the Wenchuan--Maoxian, as 1.8 ~3.8mm·a^-1; on the Xianshuihe fault belt, there is a certain difference in spatial distribution between the tensional slip rag.e and strike-slip rate： the tensional slip rate （ 8. lmm~a-1） is bigger than the sinistral strike-slip rate （ 4.8mm·a^-1） at the north of the Luhuo region; the tension and compression slip rate is basically the same as the strike-slip rate at Luhuo-Dawu; the Dawu-Kangding section presents a trend of decreased strike-slip rate and increased tensional slip rate; the Kangding-ghimian segment shows a strike-slip nature; the strike-slip rate is significantly greater than the tension/compression rate on the Xiaojiang fault zone; the slip rate on the Red River fault zone shows obvious spatial segmentation, the slip rate is smaller in its northwest part, but with a certain amount of tensional/compression component, 4. 7mm·a^-1 on the Jingdong segment. The segment east of Jingdong （ western Gejiu） is mainly of strike-slip, with a slip rate of 4. 5mm·a^-1. 相似文献
19.
A statistical analysis on earthquake activity in the Kashi-Wuqia intersection area triggered by earth tide is done by Schuster＇s test and the Permutation test on daily and monthly scales. The north-south, east-west component of the tidal force and tidal body stress are chosen as the tidal curve in the daily scale. The results show that most of the earthquakes occurred near the maximum 0° of the three kinds of tidal curves, the predominant tidal phases of the earthquake are - 5. 86°, 6. 60° and - 15. 52°, and the frequency of the earthquakes increases with the increase of the tide; with three kinds of tidal curves （the north-south, east-west component of the tidal force and tidal body stress ）, the Ps of Schuster＇s test for all the earthquakes is 10. 52 %, 2. 40 % and 2. 06 %, and the pp of the Permutation test is 10. 90%, 2. 40% and 2. 06%, and the results ofps andpp based on the east-west component of the tidal force and tidal body stress are below the threshold of 0. 05 that tidal triggering of earthquakes. In the monthly scale, both the Ps and pp are very low （ close to 0 ）, far below the threshold of 0. 05 of tidal triggering of earthquakes, and the predominant tidal phase for earthquake triggering is - 18. 95°, close to the maximum 0° （ new moon and full moon） of the earth tide in monthly scale. Regarding the statistical test result of tidal triggering of earthquakes, a preliminary explanation is given as to why the trigger effect in the east-west direction is greater than that in north-south direction. 相似文献
20.
On the basis of elastic rebound theory, using the horizontal velocity field of the Chinese mainland calculated from GPS data during three observation periods from 1999 to 2007, the velocity components that are parallel and plumb to the fault zone are calculated respectively for different periods, and then relative ground movements of two sides of the fault zone are analyzed with power function fitting and graphics. The results show that the relative ground movement shows right-lateral shear deformation before the Wenchuan Ms8. 0 earthquake, and at the same time the movement was hindered by the Longmenshan fault zone. Thus, this result has positive significance for distinguishing the elastic strain energy accumulation and deformation anomaly in an earthquake preparation process, and for conducting further research on earthquake prediction. 相似文献