Active Source Seismic Identification and Automatic Picking of the P-wave First Arrival Using a Convolutional Neural Network   总被引：1，自引：1，他引：0  

XU Zhen  WANG Tao  XU Shanhui  WANG Baoshan  FENG Xuping  SHI Jing  YANG Minghan 《中国地震研究》2019,33(2):288-304

In seismic data processing, picking of the P-wave first arrivals takes up plenty of time and labor, and its accuracy plays a key role in imaging seismic structures. Based on the convolution neural network (CNN), we propose a new method to pick up the P-wave first arrivals automatically. Emitted from MINI28 vibroseis in the Jingdezhen seismic experiment, the vertical component of seismic waveforms recorded by EPS 32-bit portable seismometers are used for manually picking up the first arrivals (a total of 7242). Based on these arrivals, we establish the training and testing sets, including 25,290 event samples and 710,616 noise samples (length of each sample:2s). After 3,000 steps of training, we obtain a convergent CNN model, which can automatically classify seismic events and noise samples with high accuracy (> 99%). With the trained CNN model, we scan continuous seismic records and take the maximum output (probability of a seismic event) as the P-wave first arrival time. Compared with STA/LTA (short time average/long time average), our method shows higher precision and stronger anti-noise ability, especially with the low SNR seismic data. This CNN method is of great significance for promoting the intellectualization of seismic data processing, improving the resolution of seismic imaging, and promoting the joint inversion of active and passive sources.  相似文献   

Using InSAR to identify hydrological connectivity and barriers in a highly fragmented wetland     

Dan Liu  Xuan Wang  Saeid Aminjafari  Wei Yang  Baoshan Cui  Shengjun Yan  Yunlong Zhang  Jie Zhu  Fernando Jaramillo 《水文研究》2020,34(23):4417-4430

Hydrological connectivity is a critical determinant of wetland functions and health, especially in wetlands that have been heavily fragmented and regulated by human activities. However, investigating hydrological connectivity in these wetlands is challenging due to the costs of high-resolution and large-scale monitoring required in order to identify hydrological barriers within the wetlands. To overcome this challenge, we here propose an interferometric synthetic aperture radar (InSAR)-based methodology to map hydrologic connectivity and identify hydrological barriers in fragmented wetlands. This methodology was applied along 70 transects across the Baiyangdian, the largest freshwater wetland in northern China, using Sentinel 1A and 1B data, covering the period 2016–2019. We generated 58 interferograms providing information on relative water level changes across the transects that showed the high coherence needed for the assessment of hydrological connectivity. We mapped the permanent and conditional (temporary) barriers affecting connectivity. In total, 11% of all transects are permanently disconnected by hydrological barriers across all interferograms and 58% of the transects are conditionally disconnected. Areas covered by reed grasslands show the most undisturbed hydrological connectivity while some of these barriers are the result of ditches and channels within the wetland and low water levels during different periods of the year. This study highlights the potential of the application of Wetland InSAR to determine hydrological connectivity and location of hydrological barriers in highly fragmented wetlands, and facilitates the study of hydrological processes from large spatial scales and long-time scales using remote sensing technique.  相似文献   

黑龙江多宝山斑岩铜矿床多期成矿及叠加改造     

刘宝山 《地质论评》2020,66(S1):29-32

  相似文献   

我国自然大气环境分类的研究     

汪宝山  李跃清 《四川气象》1999,19(2):49-52

自然大气环境的形成与地理、气候条件的影响有关。本研究从气象角度出发。通过对大气污染的数值模拟试验,客观的把我国自然大气环境分为三类。Ⅰ、Ⅱ类环境,大气扩散条件较好、净化能力较强、污染较轻,主要分布在我国的东部沿海、平原、丘陵以及内蒙古、西藏等高原地区。Ⅲ类环境,大气扩散条件差、净化能力弱、污染严重,主要分布在我国中西部的盆地、山区以及东部的长白山、武夷山等山区。  相似文献   

我国自然大气环境分类的研究     

汪宝山  李跃清  廖崇明 《高原山地气象研究》1999,19(2)

自然大气环境的形成与地理、气候条件的影响有关.本研究从气象角度出发.通过对大气污染的数值模拟试验,客观的把我国自然大气环境分为三类.Ⅰ、Ⅱ类环境,大气扩散条件较好、净化能力较强、污染较轻,主要分布在我国的东部沿海、平原、丘陵以及内蒙古、西藏等高原地区.Ⅲ类环境,大气扩散条件差、净化能力弱、污染严重,主要分布在我国中西部的盆地、山区以及东部的长白山、武夷山等山区.  相似文献   

川东伏旱与日月食关系及其预测     

汪宝山  李跃清  廖崇明 《成都信息工程学院学报》1999,(1)

日月食等天文现象使日、月球对地球的引潮力迅速增长,从而影响天气气候的变化,经分析表明,日月食与当年川东盛夏旱涝气候的发生关系密切。利用日月食出现日期、运行轨迹在若干年前就可以计算出来,信息来源特别超前的这一特点,制作出２１世纪初气候预测。预计：２１世纪初的前１０年,川东有６年为伏旱年,４年为轻或无伏旱年。  相似文献   

辽西—冀北地区铀成矿遥感地质信息研究     

于宝山 《铀矿地质》1998,14(5):287-293,307

本文从辽西－冀北铀矿床成矿地质环境、时空分布及矿床特征出发,以遥感信息为主,综合地质、物化探、水文等资料进行全区联幅分析、复合成图与应用,建立了不同岩区环、弧形构造解译标志并阐述其地质内涵。解译了火山机构、小型封闭沉积盆地和与铀矿密切相关的岩浆岩体,控矿构造和矿化蚀变带的产状、类型,解译了卫片图像“热晕点”并讨论其地质意义及其铀矿的关系,最后建立了遥感地质找矿模式和综合预测模型。  相似文献   

Nitrogen in Chinese coals     

Finkelman R.B. 《中国地球化学学报》2011,30(2):248-254

Three hundred and six coal samples were taken from main coal mines of twenty-six provinces,autonomous regions,and municipalities in China,according to the resource distribution and coal-forming periods as well as the coal ranks and coal yields.Nitrogen was determined by using the Kjeldahl method at U.S.Geological Survey(USGS),which exhibit a normal frequency distribution.The nitrogen contents of over 90% Chinese coal vary from 0.52% to 1.41% and the average nitrogen content is recommended to be 0.98%.Nitrogen in coal exists primarily in organic form.There is a slight positive relationship between nitrogen content and coal ranking.  相似文献   

Bibliometric Review of Biodiversity Offsetting During 1992-2019     

YU Shuling  CUI Baoshan  XIE Chengjie  MAN Ying  FU Jing 《中国地理科学(英文版)》2022,(2):189-203

Biodiversity offsetting plays a crucial role in managing the impacts of development on natural habitats.Developers,conserva-tion groups,governments and financia...  相似文献   

黑龙江争光金矿床方铅矿黄铁矿Rb-Sr年龄及地质意义     

刘宝山  张春鹏  寇林林  韩仁萍  李成禄 《大地构造与成矿学》2022,46(1):102-111

争光金矿床位于兴安地块东缘黑龙江省多宝山铜钼-金矿集区南东端,矿体产于早奥陶世闪长岩与下奥陶统多宝山组地层接触带及多宝山组中,为大型金矿.因缺乏精确的成矿年代学研究,其成矿时代一直存在争议.本文在争光金矿床地质背景和岩石矿物学研究的基础上,对矿区内12件矿石样品中共生矿物方铅矿和黄铁矿进行Rb-Sr同位素年代学研究.结...  相似文献