测震台网数据传输补数技术   总被引：1，自引：1，他引：0  

黄金刚  张仰辉  郭林旺 《地震地磁观测与研究》2017,38(3):209-213

针对测震台网波形数据传输中断导致丢数现象,开发测震台网自动补数系统SDARS,自动检测数据丢失现象,并从地震台数据采集器下载缺失数据;设计手动辅助补数工具软件SeisDataUtil,提供不同格式的地震数据文件的手动补数功能。通过此套补数系统,有效提高测震台网波形数据完整率,最小化减少波形数据丢失。  相似文献   

利用CWQL检测JOPENS5.2系统仪器参数正确性   总被引：1，自引：1，他引：0  

安全  张建中  苏日亚  褚福刚 《地震地磁观测与研究》2017,38(2):138-142

以锡林浩特地震台为例,利用CWQL软件调取JOPENS5.2系统台站实时数据与对应台站参数,计算台基噪声水平,检测该系统仪器参数正确性。分析认为,CWQL软件可用于日常地震观测系统数据质量检测,实现实时自动运用概率密度函数方法处理地震观测数据,得到各地震台站各分向PSD概率密度函数分布及RMS值,从而判断JOPESN5.2系统仪器参数正确性。  相似文献   

STA/LTA—AIC算法对地震P波震相拾取稳定性影响   总被引：1，自引：1，他引：0  

郭铁龙  张雪梅  邹立晔 《地震地磁观测与研究》2017,38(3):13-17

选取区域地震台网记录的地震波形数据,使用STA/LTA算法与STA/LTA—AIC算法,进行地震P波震相初至到时自动拾取,对地方震及震中距较大的震相进行P波震相拾取效果分析,发现:STA/LTA算法对于地方震P波震相识别精度较高,与STA/LTA—AIC算法拾取的P波震相初至到时相差不大;震中距变大后,STA/LTA算法对P波拾取位置相对于最佳位置向后延迟,STA/LTA—AIC算法有效矫正了STA/LTA算法拾取位置的延迟问题,与人工拾取位置差别可忽略不计。  相似文献   

宿迁地震台地震监测能力分析   总被引：1，自引：1，他引：0  

张荣杉  冯武  彭澎  贾少罡 《地震地磁观测与研究》2017,38(4):199-202

根据宿迁地震台地震计和数采参数、台站背景噪声等数据,结合历史地震观测数据,运用统计学计算方法,计算宿迁地震台地震监测能力。结果认为:宿迁地震台短周期台基背景噪声较大,微小地震监测能力较弱,但基本可以监测到M_L 2.0地方震,也可监测到150 km范围内周边城市M_L 2.5地震。  相似文献   

Multi-models for SPI drought forecasting in the north of Haihe River Basin,China     

Yuhu?Zhang  Weiwei?LiEmail author  Qiuhua?Chen  Xiao?Pu  Liu?Xiang 《Stochastic Environmental Research and Risk Assessment (SERRA)》2017,31(10):2471-2481

Drought is one of the most devastating climate disasters. Hence, drought forecasting plays an important role in mitigating some of the adverse effects of drought. Data-driven models are widely used for drought forecasting such as ARIMA model, artificial neural network (ANN) model, wavelet neural network (WANN) model, support vector regression model, grey model and so on. Three data-driven models (ARIMA model; ANN model; WANN model) are used in this study for drought forecasting based on standard precipitation index of two time scales (SPI; SPI-6 and SPI-12). The optimal data-driven model and time scale of SPI are then selected for effective drought forecasting in the North of Haihe River Basin. The effectiveness of the three data-models is compared by Kolmogorov–Smirnov (K–S) test, Kendall rank correlation, and the correlation coefficients (R²). The forecast results shows that the WANN model is more suitable and effective for forecasting SPI-6 and SPI-12 values in the north of Haihe River Basin.  相似文献   

Analysis of elastic anisotropy of tight sandstone and the influential factors     

Lian-Teng Song  Zhong-Hua Liu  Can-Can Zhou  Jun Yu  Li-Jun Xiu  Zhong-Chun Sun  Hai-Tao Zhang 《应用地球物理》2017,14(1):10-20

Tight sandstone has a certain anisotropy. Using ultrasonic measurements of samples in three different directions and related matched experiments, this study systematically analyzes the pore structure and anisotropy of tight sandstone samples obtained from oil fields and compares results with those of shale. Results firstly show that the anisotropy of tight sandstone is mainly related to the compositional layering and thin interbedding which occur in different sedimentary environments. Tight sandstone has typical transverse isotropic medium characteristics, Young’s modulus increases in different directions with increasing confining pressure, Poisson’s ratio change is not obvious, anisotropic coefficients decrease with increasing effective pressure, and a certain linear relationship exists between ε, γ, and δ. This article finally summarizes anisotropy in different areas, thereby providing a foundation for the use of suitable appraisal models in different regions. This research can be used as an experimental reference for logging evaluation, seismic data interpretation, and fracturing develop of tight sandstones.  相似文献   

Copula-based identification of the non-stationarity of the relation between runoff and sediment load     

Shengzhi Huang  Pei Li  Qiang Huang  Guoyong Leng 《国际泥沙研究》2017,32(2)

It is important to identify the non-stationarity in the relation between runoff and sediment load under the backdrop of the changing environment. This relation helps to further understand the mechanisms of runoff and sediment yield. A copula-based method was used to detect possible change points in the relation between runoff and sediment load in the Wei River Basin (WRB), China, where soil erosion is a very severe issue. The modified Mann-Kendall trend test method was applied to obtain the trends of runoff and sediment load spanning 1960–2010 at monthly and annual timescales. Finally, the causes of the identified non-stationarity of the relation between runoff and sediment load were roughly analyzed from the perspective of climate change and human activities. Results indicated that:(1) the runoff and sediment load in the Jinghe and Wei rivers were generally characterized by noticeably decreasing trends at both monthly and annual timescales;(2) both the Jinghe and Wei rivers had a common change point (2002), implying that the stationarity of the relation between runoff and sediment load in the Jinghe and Wei River was invalid; (3) human activities including increasing water consumption and growing application of soil conservation practices are dominant factors resulting in non-stationarity in the rela-tion between runoff and sediment load in the WRB. This study provides a new idea for identifying the non-stationarity of multivariate relation in the hydro-meteorological field under the background of the changing environment.  相似文献   

数字地震台电源远程监控系统     

张秀萍  王曰风  郑毅  王志敏  张广莉  韩和平 《地震地磁观测与研究》2017,38(4):218-221

以STC89C52单片机为核心,开发基于"十五"网络的地震台站电源远程监控系统,实时的监控台站仪器设备的状态并收取状态参数,实现设备复位操作及故障报警,可以提高地震台网中心仪器运行效率。  相似文献   

Diffraction separation by plane-wave prediction filtering     

Xue Kong  De-Ying Wang  Zhen-Chun Li  Rui-Xiang Zhang  Qiu-Yuan Hu 《应用地球物理》2017,14(3):399-405

Seismic data processing typically deals with seismic wave reflections and neglects wave diffraction that affect the resolution. As a general rule, wave diffractions are treated as noise in seismic data processing. However, wave diffractions generally originate from geological structures, such as fractures, karst caves, and faults. The wave diffraction energy is much weaker than that of the reflections. Therefore, even if wave diffractions can be traced back to their origin, their energy is masked by that of the reflections. Separating and imaging diffractions and reflections can improve the imaging accuracy of diffractive targets. Based on the geometrical differences between reflections and diffractions on the plane-wave record; that is, reflections are quasi-linear and diffractions are quasi-hyperbolic, we use plane-wave prediction filtering to separate the wave diffractions. First, we estimate the local slope of the seismic event using planewave destruction filtering and, then, we predict and extract the wave reflections based on the local slope. Thus, we obtain the diffracted wavefield by directly subtracting the reflected wavefield from the entire wavefield. Finally, we image the diffracted wavefield and obtain high-resolution diffractive target results. 2D SEG salt model data suggest that the plane-wave prediction filtering eliminates the phase reversal in the plane-wave destruction filtering and maintains the original wavefield phase, improving the accuracy of imaging heterogeneous objects.  相似文献   

Retrieval of middle and upper atmospheric wind based on non-full circular fringe recorded by Fabry-Perot Inteferometer     

HouMao Wang  Chong Wang  YongMei Wang  XiaoXin Zhang  Cong Huang  ShaoLin Liang 《中国科学:地球科学(英文版)》2017,60(9):1732-1738

Fabry-Perot Interferometer(FPI) has been used widely for wind measurements of the middle and upper atmosphere.To date, most of FPIs have been based on full-closed circular fringe, which needs 15–25 min to obtain a group of wind velocity(zonal and meridional). However, it is hard to improve the temporal resolution because full-closed circular fringe in several directions cannot be easily imaged onto the same Charge-Coupled Device(CCD) with enough airglow intensity. In this paper, a data processing method is proposed for non-full circular fringe of FPI, which can support CCD with enough area of observations in several directions simultaneously. The method is focused on the center determination of non-full fringe. It includes radial cross-section, peak coordinate determination, and center calculation. Based on the calculated center, the fringe is annular summed. Then its radius is determined subsequently using Gaussian fitting. Finally, the wind is retrieved from the fringe radius. For validation, fringes from two ground-based FPIs were used, which are deployed in Kelan(38.71°N, 111.58°E) and Xinglong(40.40°N, 117.59°E) in China. The results retrieved from non-full fringes of FPIs were compared with that from full-closed circular fringe. The averaged wind deviation between them demonstrates reasonable difference with 5.38 ms~-(1) for 892.0 nm airglow emission, 5.81 ms~-(1) for 630.0 nm emission, and 3.03 ms~-(1) for 557.7 nm emission. Besides, wind results of Xinglong FPI are compared roughly with measurements of meteor radar which is deployed in Ming Tombs of Beijing(40.3°N,116.2°E). Good agreement demonstrates that this method is robust enough for FPI wind retrieval of mesosphere and thermosphere.  相似文献