浙江临安4.2级地震特征及烈度调查     

马志江  马起杨  侯林锋  石树中  杨福平 《震灾防御技术》2018,13(3):689-696

2017年4月12日,浙江省杭州市临安市发生4.2级地震,地震震中附近的潜川镇、河桥镇震感强烈,於潜镇、太阳镇、湍口镇等震感较为明显。在对震区地质构造、震源机制解资料分析的基础上,开展了烈度调查,并绘制了地震烈度图。本次地震震中烈度为Ⅴ度,面积22.6km2,烈度圈长轴方向北东向,与马金-乌镇断层走向一致。  相似文献   

Rupture process of the 2015 Pishan earthquake from joint inversion of InSAR,teleseismic data and GPS     

Xun Wang  Weimin Wang  Junmeng Zhao  Zhenxing Yao 《中国科学:地球科学(英文版)》2018,61(10):1467-1481

An earthquake of Mw6.4 occurred in Pishan County in Xinjiang Province, northwestern Tibetan Plateau, on July 3,2015. The epicenter was located on an active blind thrust system located at the northern margin of the Western Kunlun Mountain Orogenic Belt southwest of the Tarim Basin. We constructed a shovel-shaped fault model based on the layered-crust model with reference to the seismic reflection profile, and obtained the rupture process of the earthquake from the joint inversion of Interferometric Synthetic Aperture Radar(InSAR) measurements, far-field waveform data, and Global Positioning System(GPS) data. The results show that the seismic fault dips southward with a strike of 109°, and the rupture direction was essentially northward. The fault plane rupture distribution is concentrated, with a maximum recorded slip of 73 cm. The main features of the fault are as follows: low inclination angle(25°–10°), thrust slip at a depth of 9–13 km, rupture propagation time of about 12 s, no significant slip in soft or hard sedimentary layers at 0–4 km depth and propagation from the initial rupture point to the surrounding area with no obvious directionality. The InSAR time-series analysis method is used to determine the deformation rate in the source region within 2 years after the earthquake, and the maximum value is ~17 mm yr-1 in the radar line-of-sight direction. Obvious post-earthquake deformation is evident in the hanging wall, with a similar trend to the coseismic displacement field. These results suggest that the Pishan earthquake has not completely released the accumulated energy of the region, given that the multilayer fold structure above the blind fault is still in a process of slow uplift since the earthquake. Post-earthquake adjustment models and aftershock risk analysis require further study using more independent data.  相似文献   

Impact of anthropogenic drivers on subaqueous topographical change in the Datong to Xuliujing reach of the Yangtze River   总被引：3，自引：0，他引：3  

Shuwei Zheng  Heqin Cheng  Shengyu Shi  Wei Xu  Quanping Zhou  Yuehua Jiang  Fengnian Zhou  Minxiong Cao 《中国科学:地球科学(英文版)》2018,61(7):940-950

Changes of subaqueous topography in shallow offshore water pose safety risks for embankments,navigation,and ports.This study conducted measurements of subaqueous topography between Datong and Xuliujing in the Yangtze River using a Sea Bat 7125 multi-beam echo sounder,and the channel change from 1998 to 2013 was calculated using historical bathymetry data.The study revealed several important results:(1)the overall pattern of changes through the studied stretch of the river was erosion–deposition–erosion.Erosion with a volume 700×10~6m~3occurred in the upper reach,deposition of about 204×10~6m~3occurred in the middle reach,and erosion of about 602×10~6m~3occurred in the lower reach.(2)Dunes are the most common microtopographic feature,accounting for 64.3%of the Datong to Xuliujing reach,followed by erosional topography and flat river topography,accounting for 27.6%and 6.6%,respectively.(3)Human activities have a direct impact on the development of the microtopography.For instance,the mining of sand formed holes on the surface of dunes with lengths of 20–35 m and depths of 3–5 m.We concluded that the overall trend of erosion(net erosion volume of 468×10~6m~3)occurred in the study area mainly because of the decreased sediment discharge following the closure of the Three Gorges Dam.However,other human activities were also impact factors of topographic change.Use of embankments and channel management reduced channel width,restricted river meandering,and exacerbated the erosion phenomenon.  相似文献   

基于U形卷积神经网络的震相识别与到时拾取方法研究   总被引：8，自引：0，他引：8       下载免费PDF全文

赵明  陈石  房立华  David A Yuen 《地球物理学报》2019,62(8):3034-3042

精确获取震相到时是地震定位和地震走时成像等研究的重要基础.近年来,随着地震台站的不断加密,地震台网监测到的地震数量成倍增长,发展快速、准确、适用性强的震相到时自动拾取算法是地震行业的迫切需求.本文在前人工作基础上,发展了Pg、Sg震相自动识别与到时拾取的U网络算法（Unet_cea）,使用汶川余震和首都圈地震台网记录的89344个不同震级、不同信噪比的样本进行训练和测试.研究表明,U网络能够较好地识别Pg、Sg震相类型和拾取到时,Pg、Sg震相的正确识别率分别为81%和79.1%,与人工标注到时的均方根误差分别为0.41 s和0.54 s.U网络在命中率、均方根误差等性能指标上均明显优于STA/LTA和峰度分析自动拾取方法.研究获得的最优模型可以为区域地震台网的自动处理提供辅助.  相似文献   

海洋温差能发电技术的现状与前景   总被引：2，自引：0，他引：2  

李伟 赵镇南王迅  刘奕晴 《海洋工程》2004,22(2):105-108

对海洋温差能发电技术的基本原理、类型、系统与装置、发展历史和现状作了全面的综述。介绍了国内外海洋温差发电技术的特点、难点和近期的研究热点,指出海洋温差发电技术必须与附属产品的开发利用相结合才能有竞争力,海洋温差发电技术要达到规模产业化还有相当长的路要走。  相似文献   

应用C/S与B/S混合结构的矿产资源管理信息系统     

王迅  杨耀环 《地理空间信息》2010,8(5):82-84

为了利用GIS对矿产资源进行有效的管理,对C/S和B/S两种网络体系结构进行了比较分析,并简单介绍了两种模式开发平台ArcEngine和ArcGIS Server。在GIS技术和数据库技术的支持下,对系统进行设计开发,实现了基于C/S和B/S混合结构的平顶山矿产资源管理系统。  相似文献   

机载三线阵传感器航空摄影测量的坐标转换方法研究     

耿迅  杨天克  缪剑 《测绘科学》2010,35(4):65-67

由于机载GPS获取的数据是WGS84坐标系,定向测图时首先要进行坐标转换。本文讨论了7参数平面转换模型与GPS水准测量拟合高程异常的方法,研究了数字航空摄影测量的像控点布设问题,并对数字航空摄影测量只在测区四角布设控制点即可满足空三精度要求的观点进行了分析。实验结果表明,机载三线阵航空摄影测量中高精度的7参数转换与似大地水准面精化成果是获取高精度空三的前提。  相似文献   

Assessment and zonation of storm surge hazards in the coastal areas of China     

Xianwu  Shi  Ziqiang  Han  Jiayi  Fang  Jun  Tan  Zhixing  Guo  Zhilin  Sun 《Natural Hazards》2020,101(1):39-57

Natural Hazards - Coastal inundation due to storm tides is computed using ADvanced CIRCulation (ADCIRC) model along the east coast of India. Inland inundation due to storm tides is calculated every...  相似文献   

水平分支注浆孔卡埋钻事故处理实践          下载免费PDF全文

石逊  刘江  李红梅  伍晓龙  王雷浩 《探矿工程》2020,47(9):33-38

近年来煤矿奥灰治水注浆定向钻进技术发展迅速,多分支超深水平注浆孔数量激增。在水平注浆孔施工过程中,普遍存在地层漏失量大,泥浆突然失返,小径钻孔裸孔段长,水平段孔眼轨迹复杂,控制难度大,靶点技术误差要求严,定向仪器、工具等价格昂贵,施工风险相对较高,极易发生埋钻卡钻事故。一旦发生卡钻事故,就会面临着处理周期长、处理难度大等问题,传统的卡埋钻处理方法在水平注浆孔中应用效果不明显。通过采用空压机输送压缩空气,破坏水平孔着床的沉砂结构,将着床的沉砂吹出孔外或吹入地层裂隙,成功地实现了解卡。总结了水平注浆孔施工中卡埋钻事故的预防措施。  相似文献   

CMD180T型钻机在尚义地热井施工中的应用          下载免费PDF全文

王雷浩  李光宏  石逊  殷邈 《探矿工程》2020,47(1):58-61

经物探分析在河北省张家口尚义县大青沟镇南海子村东南1.0 km存在深部断裂构造,为了寻找开发坝上地区地热资源,决定在该位置施工一口2000 m深地热井,即穿过该断裂构造寻找导水通道,完成地热井施工任务。施工中采用了CMD180T型钻机,该钻机采用了先进的全液压传动系统,自动化程度高,性能优异,可大大降低操作人员的劳动强度且易于搬迁、易于操作。其优势在这次地热井工程施工过程中得到了充分的体现。  相似文献