尾波干涉技术在2017年重庆武隆MS 5.0地震后震源区地壳介质变化的应用

2017年11月23日,重庆武隆发生M_S 5.0地震,震后1个月内发生107次M_L≥1.0地震,双差定位结果显示,主震震源深度约10 km,破裂面呈近SW向单侧破裂。选取震中附近布设的3个流动台地震波形及观测资料记录,利用波形互相关技术,挑选武隆M_S 5.0地震后符合条件的重复地震事件,利用尾波干涉技术,分析震源区震后地壳介质变化。结果显示：①S波早期尾波部分呈明显的线性变化,可能由震源区附近地壳介质的波速变化所引起;②由震中距最小的重复地震计算的相对波速变化最大;③在P波尾波发现走时延迟和不相关系数均存在1个短周期“尖峰”变化,可能与震后地下介质中散射体的运移有关;④震后局部地区的地震波速度存在上升—下降的恢复过程。     

定量与定性分析在2017年精河MS6.6地震中的应用

为准确提取震前异常信息,以2017年新疆精河M_S6.6地震为例,基于乌鲁木齐台站W-N(k)测段数据,利用离差统计分析方法与原始曲线分析方法分别从定量与定性两个角度研究了地震前后的数据异常特征。结果显示,震前测段数据的变差系数成倍增大,离差分布曲线偏离正态分布,原始曲线出现大幅转折,断层活动形式出现明显变化,震后异常特征消失。通过效果图可知,结合两种方法分析数据异常具有一定的可行性,能为震前异常识别提供参考。     

威远MS 5.4地震序列活动特征与成因分析

通过对威远M_S 5.4地震背景与活动特征研究,表明自贡地震监测中心加强流动监测提高了威远M_S 5.4地震序列地震参数的精度和地震信息报送的准确性。威远M_S 5.4地震前经历了区域地震平静至活跃、再发震的过程,威远M_S 5.4地震为一般主—余型地震,其ρ、b值异常可能反映了其后将发生资中M_S 5.2地震。威远M_S 5.4地震序列及其附近的华蓥山断裂地震带和马边地震带震后时间扫描地震学参数均正常,威远M_S 5.4地震区近期再次发生更大地震的可能性较小;并认为威远M_S 5.4发震断裂为荣县—威远基底断裂,华蓥山断裂带及其附近荣县—威远—资中地区2018年开始的4—6级地震活跃与川西地区东昆仑断裂带2017年8月8日九寨沟M_S 7.0地震的发生存在呼应关系。     

中国大陆MS≥7.0地震与太阳黑子活动之间关系的统计检验

利用1900—2017年间中国大陆地区64次M_S≥7.0地震资料,根据太阳黑子11年周期变化计算了它们的相位角,分析了它们的相位角分布,利用统计检验方法对它们与太阳黑子11年周期变化之间的关系进行了检验。结果是:中国大陆地区M_S≥7.0地震中约66%发生在太阳黑子11年周期变化的谷值点前2年—后3年的时段内,在α=0.001显著性水平下通过显著性检验。2019年底太阳黑子11年周期变化将达谷值点,因此,2018—2022年为中国大陆地区M_S7.0地震易发时段。      

Identification of estrogen-like alkylphenols in produced water from offshore oil installations

Produced water released into the sea from oil installations contains a vast number of organic compounds. This work focuses on the analysis and identification of phenols in produced water, in particular long-chain para-substituted alkylphenols, which act as endocrine disruptors for marine biota. Some alkylphenol standards, unavailable commercially, have been synthesised and some compounds of interest identified. However, a complete identification is not possible since conventional GC techniques cannot achieve the desired degree of separation. An overview of the levels of the 52 known alkylphenols in produced water from nine oil installations in the North and Norwegian Seas has been made. The previously unidentified alkylphenols in produced water have been characterised by means of alkylphenol retention indices (APRI) and mass spectrometry, and their total amounts estimated for the same nine locations. Our results confirm the presence of naphthols and other as yet unidentified compounds in produced water, while thiophenols were not detected by the used technique.     

1∶10000地形图的数据编辑及入库

辽宁省1∶10 000地形图的数据更新及建库任务已由图面、入库两套数据发展成为图库一体化的数据资料,方便作业的同时提高了工作效率。本文主要基于Autodesk MAP6平台,结合工作实际,对1∶10 000地形图数据编辑、数据入库,以及数据转换等进行了简单论述。     

Seismic stratigraphy records the deglacial history of Jakobshavn Isbræ, West Greenland

Jakobshavn Isbræ is one of the largest ice streams in the Greenland Ice Sheet, presently draining c. 6.5% of the Inland Ice. Here we present high‐resolution Chirp and Sparker sub‐bottom profiles from a seismic survey conducted just outside of the Jakobshavn Isfjord, which provides detailed insight into the glacimarine sedimentary history of the Jakobshavn ice stream during the Holocene. We observe acoustically stratified and homogeneous sediments that drape an irregular substratum and were deposited between ～10 and c. 7.6k cal a BP. The stratified lower units are interpreted as the product of ice‐proximal glacimarine sedimentation deposited rapidly when the grounded ice margin was located close to depositional basins on topographic highs. The upper acoustically homogenous units reflect suspension settling of fine‐grained material and gravitational flows that were extruded from an increasingly unstable ice margin as the ice retreated into the fjord. Proximity to the ice margin and bedrock topography were the dominant controls on sediment accumulation during deglaciation although the 8.2‐ka cooling event probably influenced the position of the ice margin at the fjord mouth. The post‐glacial sedimentary record is characterized by glacimarine and hemipelagic rainout with an increased ice‐rafted detritus fraction that records sedimentation following ice stream retreat into Jakobshavn Isfjord sometime after c. 7.8k cal a BP. Copyright © 2011 John Wiley & Sons, Ltd.     

.NET框架下IPv6和IPv4双协议兼容的测试用例实现

在.NET框架下,利用VC＋＋编程语言开发在Windows平台上检测IPv6网络互联情况的测试用例程序,程序对IPv4同样兼容。主要介绍了适用于双协议的Socket API函数和Socket通信原理,给出在双协议下客户机/服务器通信的应用程序及实现思路,为双协议下的其它网络应用程序开发打基础。     

基于IPv6组播的聊天系统的实现

聊天系统实现了在IPv6环境中组播技术的一个具体实例,并根据项目需要搭建了一个小规模的IPv6实验网,经测试可以稳定地运行在IPv6网络环境中,基本实现了IPv6组播应用.     

估算天然气成熟度的新指标--金刚烷指标

采用天然气重烃富集及MID/GC/MS分析技术,从天然气中检测出单、双金刚烷类化合物。根据琼东南盆地生油岩中金刚烷指标 (Ⅱ )与镜煤反射率 (Ro)的实测值,结合应用塔里木盆地、鄂尔多斯盆地的上述实测数据点,建立了双金刚烷指标与镜煤反射率 (Ro)数值对应关系。根据这种关系成功地确定和研究了莺-琼盆地三个构造天然气的成熟度。研究成果不仅提供了检测天然气中金刚烷类化合物的方法,扩大了金刚烷类化合物的应用范围,而且表明金刚烷类化合物是研究天然气成熟度的一个有效指标