阿尔金断裂带地壳和上地幔结构的P波层析成像   总被引：16，自引：3，他引：13       下载免费PDF全文

史大年  姜枚  马开义  薛光琦  董英君  G.Wittlinger  G.Herquel 《地球物理学报》1999,42(3):341-350

阿尔金断裂是青藏高原西北边缘最主要的断裂．天然地震P波层析成像结果揭示了阿尔金断裂（严格地说这里指阿尔金断裂中部,下同）为一条宽约40km左右的低速带,并以比较直立的产状向下延伸至150km左右深度．结果同时显示塔里木岩石圈曾经挤入到柴达木盆地下面,并受到后来发育起来的阿尔金断裂的切割．本次研究结果支持青藏高原中北部上地幔热物质参与了支撑高原高海拔地形的重力均衡作用的假设。  相似文献   

具有稳健初值的选权迭代法   总被引：4，自引：0，他引：4  

邱卫宁 《武汉大学学报(信息科学版)》2003,28(4):452-454

提出先采用线性规划来确定残差的初值，然后再进行选权迭代这样一种方法，其估计结果既具有线性规划的稳健性，又具有最小二乘的最优性。试验表明，这种基于线性规划的稳健估计具有很强的稳健性和检测粗差的能力，其计算结果与没有粗差时的最小二乘估计结果一致，且方法简单、可靠、实用。  相似文献   

Arrival-time residuals and hypocentre mislocation     

Luděk Klimeš 《Pure and Applied Geophysics》1996,148(1-2):337-342

It is shown that the arrival-time residuals and hypocentre mislocation are two mutually independent consequences of the inaccurate seismic model and inaccurately measured arrival times. The minimum residuals resulting from the kinematic hypocentre determination contain no information on the accuracy in determining the hypocentre position.  相似文献   

卡尔曼滤波在阳山金矿控制测量中的应用     

叶培 《地质与勘探》2014,50(Z1):1446-1450

卡尔曼滤波在信号处理与系统控制领域应用广泛。本论文主要是利用卡尔曼滤波数学模型对控制测量中的GPS信号、星历和残差进行优化,从而在同一时间、同一地点、同一天气的情况下尽量提高GPS精度。  相似文献   

低成本GNSS模块RTK性能比较分析     

刘星  李安然  石俊炯  李春花 《测绘科学》2021,46(3):27-31,79

针对低成本GNSS模块及天线类型直接影响RTK性能的问题,该文选取了具有代表性的3种GNSS定位模块华大HD9310、UBLOX NEO-M8T、UBLOX ZED-F9P,以及测地型天线U35和螺旋天线BT-3070两种不同类型的天线。采集GNSS天线和模块不同组合的原始观测数据,深入分析了不同组合的原始GNSS数据的信噪比、模糊度解算初始化时间、伪距与载波相位的双差残差以及定位精度。结果表明:U35天线性能优于BT-3070天线;ZED-F9P模块性能优于NEO-M8T模块和HD9310模块。实验结果可为无人设备、工程测量等领域选取合适的RTK组合提供参考。  相似文献   

Reconstructing and understanding the impacts of storms and surges,southern North Sea          下载免费PDF全文

Sue M. Brooks  Tom Spencer  Anna McIvor  Iris Möller 《地球表面变化过程与地形》2016,41(6):855-864

Coastal barriers are ubiquitous globally and provide a vital protective role to valuable landforms, habitats and communities located to landward. They are, however, vulnerable to extreme water levels and storm wave impacts. A detailed record of sub‐annual to annual; decadal; and centennial rates of shoreline retreat in frontages characterized by both high (> 3 m) and low (< 1 m) dunes is established for a barrier island on the UK east coast. For four storms (2006–2013) we match still water levels and peak significant wave heights against shoreline change at high levels of spatial densification. The results suggest that, at least in the short‐term, shoreline retreat, of typically 5–8 m, is primarily driven by individual events, separated by varying periods of barrier stasis. Over decadal timescales, significant inter‐decadal changes can be seen in both barrier onshore retreat rates and in barrier extension rates alongshore. Whilst the alongshore variability in barrier migration seen in the short‐term remains at the decadal scale, shoreline change at the centennial stage shows little alongshore variability between a region of barrier retreat (at 1.15 m a^?1) and one of barrier extension. A data‐mining approach, synchronizing all the variables that drive shoreline change (still water level, timing of high spring tides and peak significant wave heights), is an essential requirement for validating models that predict future shoreline responses under changing sea level and storminess. © 2016 The Authors. Earth Surface Processes and Landforms published by John Wiley & Sons Ltd.  相似文献   

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陈西江  花向红  丁鸽  田茂 《大地测量与地球动力学》2013,33(5):91-96

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溧阳地震台体应变观测数据质量分析     

毛华锋  胡米东  王皓  张杰 《地震地磁观测与研究》2018,39(3):142-146

对溧阳地震台体应变观测资料变化形态、观测质量和观测精度、潮汐因子中误差、地震波记录能力等参数进行分析,采用固体潮汐残差矢量分析方法进行分析,对该台2010—2015年观测资料进行分析,发现体应变能记录到全球不同地区、不同震级的同震波,波形清晰,为分析预报人员进行地震研究提供依据。  相似文献