地震计阶跃标定自动处理算法研究   总被引：1，自引：0，他引：1  

朱小毅  林湛  陈阳  彭朝勇  杨桂存  李建飞  庄丹宁 《地震地磁观测与研究》2010,31(1):43-48

标定是监测运行中的地震计主要技术参数的有效手段,保证了观测数据的产出质量。本文介绍了一种新的地震计阶跃标定算法,旨在提高算法的稳定性和自动化程度,适合计算机自动的,成批的处理标定数据。  相似文献   

JCZ-1T超宽频带地震计LP垂直通道记录的固体潮特征     

曾宪军  孙宏博  张娟  陈俊 《地震地磁观测与研究》2010,31(4):108-114

JCZ-1T超宽频带地震计具有全频带覆盖特性,其低频端输出延伸到固体潮汐,利用地震计LP通道的垂直分向观测数据,经过处理获得有关的固体潮资料,通过对记录信号的频谱分析对其有了初步的认知。JCZ-1T超宽频地震计LP加速度垂直通道记录的观测信号以固体潮汐信息为主,用该仪器观测可以获取与地震相关的综合观测数据,分析JCZ-1T记录波形叠加的的固体潮信息有着重要的实际意义,通过对资料处理运用,可以与传统前兆仪器结合观测,拓展其研究应用领域,更好的服务于地震科学研究。  相似文献   

深埋隧洞极强岩爆段隧道掘进机半导洞掘进岩爆风险研究   总被引：3，自引：0，他引：3  

肖亚勋  冯夏庭  陈炳瑞  丰光亮  张照太  明华军 《岩土力学》2011,32(10):3111-3118

深埋隧洞TBM（隧道掘进机）全断面掘进时,在局部超高应力集中的完整硬脆性岩体洞段将直面极强岩爆的风险,设备和人员的安全将遭受极大的威胁。在锦屏II水电站3#引水隧洞极强岩爆段实施了“先半导洞+TBM联合掘进”实验,结合微震实时监测信息对TBM半导洞掘进的岩爆风险开展了研究。监测结果表明,（1）TBM半导洞掘进期间,日平均微震事件数、日平均辐射微震能、微震大事件数及实际岩爆发生次数和强度均远远低于TBM全断面掘进;（2）能量指数对数值和累积视体积的时域演化表明,TBM半导洞掘进强烈岩爆发生的风险远低于TBM全断面掘进,现场实际开挖也证明了这一点;（3）半导洞洞段微震事件的空间集结程度、总数、震级大小与能量辐射均远小于全断面洞段。因此,TBM半导洞掘进的岩爆风险远远低于TBM全断面掘进,在具有施工条件的情况下采用先半导洞预处理,然后TBM半断面掘进极强岩爆段,以期控制岩爆风险的方案是可行的。  相似文献   

VP宽频带倾斜仪现场自动校准装置设计          下载免费PDF全文

马武刚  张肖 《地震工程学报》2016,38(4):658-662

为了对VP宽频带倾斜仪进行现场校准,设计了一款基于单片机AT89C51的新型现场自动校准装置。经验证该装置在+8V激励电压情况下与高精度激光干涉仪结合使用,其校准相对误差为0.36%,满足小于1%的校准相对误差要求。  相似文献   

Validation of ground‐motion simulations for historical events using MDoF systems     

Carmine Galasso  Peng Zhong  Farzin Zareian  Iunio Iervolino  Robert W. Graves 《地震工程与结构动力学》2013,42(9):1395-1412

The study presented in this paper addresses the issue of engineering validation of Graves and Pitarka's (2010) hybrid broadband ground motion simulation methodology with respect to some well‐recorded historical events and considering the response of multiple degrees of freedom (MDoF) systems. Herein, validation encompasses detailed assessment of how similar is, for a given event, the seismic response due to comparable hybrid broadband simulated records and real records. In the first part of this study, in order to investigate the dynamic response of a wide range of buildings, MDoF structures are modeled as elastic continuum systems consisting of a combination of a flexural cantilever beam coupled with a shear cantilever beam. A number of such continuum systems are selected including the following: (1) 16 oscillation periods between 0.1 and 6 s; (2) three shear to flexural deformation ratios to represent respectively shear‐wall structures, dual systems, and moment‐resisting frames; and (3) two stiffness distributions along the height of the systems, that is, uniform and linear. Demand spectra in terms of generalized maximum interstory drift ratio (IDR) and peak floor acceleration (PFA) are derived using simulations and actual recordings for four historical earthquakes, namely, the 1979 M_w 6.5 Imperial Valley earthquake, 1989 M_w 6.8 Loma Prieta earthquake, 1992 M_w 7.2 Landers earthquake, and 1994 M_w 6.7 Northridge earthquake. In the second part, for two nonlinear case study structures, the IDR and PFA distributions over the height and their statistics, are obtained and compared for both recorded and simulated time histories. These structures are steel moment frames designed for high seismic hazard, 20‐story high‐rise and 6‐story low‐rise buildings. The results from this study highlight the similarities and differences between simulated and real records in terms of median and intra‐event standard deviation of logs of seismic demands for MDoF building systems. This general agreement, in a broad range of moderate and long periods, may provide confidence in the use of the simulation methodology for engineering applications, whereas the discrepancies, statistically significant only at short periods, may help in addressing improvements in generation of synthetic records. Copyright © 2013 John Wiley & Sons, Ltd.  相似文献   

Research on EPS application to very wide highway embankments in permafrost regions     

YaHu Tian  JianHong Fang  YuPeng Shen 《寒旱区科学》2013,5(4):0503-0508

In order to maintain the thermal stability of very wide highway embankments in permafrost regions, the thermal isolation material EPS is often utilized. To examine the effects of this insulation on the China National Highway (G214), two-dimensional finite element analysis of temperature fields was conducted for varying widths of highway embankments with and without EPS insulation. The numerical results show that in permafrost regions the effect of thermal aggregation on asphalt pavement is more obvious when highway embankments are wider, and, specifically for the G214 highway, the insulation should be more than 25 cm thick for 24-m-wide embankments. However, considering other factors such as the structural rationality of the embankments and high engineering costs, it might not be feasible to install EPS insulation in 24-m-wide embankments of the G214 highway when the height of the embankments is less than 3.65 m.  相似文献   

地震台JCZ-1与JCZ-1T甚宽频带地震仪对比观测分析     

田文德  叶建庆  胡俊明 《地震研究》2013,36(3)

采用成都基准地震台JCZ-1型和JCZ-1T甚宽频带数字地震仪同一时间段记录的地方震、近震和远震的地脉动噪声做功率谱分析.结果表明,JCZ-1和JCZ-1T型甚宽频带地震仪在主要频带内对地噪声的响应程度是一致的.在高频端和低频端JCZ-1T型地震计分辨率更高,且信噪比更高,高出10 ～ 20 dB.JCZ-1型地震计由于长期使用导致材料老化以及受环境温度或气流微量变化的影响,地震计的噪声较高,可能对地震波记录的幅值产生5％左右的影响.JCZ-1T型地震计在安装过程中所采取的保温、防气流扰动等各种防护措施是可靠的.  相似文献   

渤海海底地震仪探测试验及初步成果   总被引：4，自引：0，他引：4  

支鹏遥  刘保华  华清峰  刘晨光  裴彦良  郑彦鹏  郝天珧 《地球科学进展》2012,27(7):769-777

利用大容量气枪枪阵震源和海底地震仪在渤海首次开展人工地震深部地球物理探测试验。本次试验布设一条NWW-SEE向垂直构造走向的勘测线,共投放海底地震仪51台,回收成功50台。试验结果和数据分析表明,所使用的枪阵有足够的能量输出,海底地震仪记录震相丰富,可识别到Ps,Pg,PmP,Pn等多种震相。初至波层析成像结果表明,9 km以上地层速度结构存在明显的横向不均匀性,渤中地区新生代沉积基底埋深5～6 km,结晶基底埋深约9 km,郯庐断裂带内存在"U"型下凹的相对低速体并有向下切割的趋势。此次试验是我国在渤海深部探测中的成功示范,有效填补了渤海海域深地震测深数据的空白,为渤海深部地壳结构研究及含油气盆地形成演化研究提供了重要的基础资料。  相似文献   

平武地震台数字地震仪记录近震震级及定位偏差   总被引：2，自引：0，他引：2  

刘学华 《四川地震》2011,(2):32-35

以《四川省地震台网地震目录》作为地震定位参考标准,对平武地震台数字地震仪记录的近震,尤其是汶川＂5·12＂地震序列定位参数进行了对比。结果表明,平武单台数字地震仪记录得到的测定结果与《四川省地震台网地震目录》间存在一定程度的差异。这里给出了台站可以简单应用的偏差评估值和处理方法。  相似文献   

泉州地震台数字地震仪台址的地脉动噪声分析     

林建生  张有明  谢文杰  吴淑美  王建新 《华南地震》2011,31(1):18-28

利用2008年泉州台甚宽频带数字地震仪连续48 h和全年每月连续48 h内白天与夜间各连续4 h的地脉动记录,计算5 Hz、5 s和100s的静态地脉动噪声功率谱密度、1/3倍频程1-20Hz带宽各段的平均静态地脉动噪声有效值、1/3倍频程100-30 s带宽各段的平均静态地脉动加速度噪声有效值,以及上述3个频点和2个...  相似文献