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近震

近震的相关文献在1989年到2022年内共计76篇,主要集中在地球物理学、灾害及其防治、财政、金融 等领域,其中期刊论文73篇、专利文献36332篇;相关期刊33种,包括地震、地震学报、震灾防御技术等; 近震的相关文献由202位作者贡献,包括柴剑勇、王雄健、严尊国等。

近震—发文量

期刊论文>

论文:73 占比:0.20%

专利文献>

论文:36332 占比:99.80%

总计:36405篇

近震—发文趋势图

近震

-研究学者

  • 柴剑勇
  • 王雄健
  • 严尊国
  • 刘希强
  • 刘芳
  • 吕俊强
  • 徐长银
  • 曾小苹
  • 朱晞
  • 李小萍
  • 期刊论文
  • 专利文献

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    • 陈闯; 危自根; 张璇; 高金哲
    • 摘要: 分析了相邻井下、地表地震计记录的背景噪声及近震、远震波形特征,以及相关的振幅谱及近震、远震接收函数波形特征。结果表明,井下地震计记录的背景噪声比地表地震计小1个数量级,其近震、远震波形记录较清晰、简洁;井下、地表地震计记录的远震振幅谱和径向接收函数具有较好的一致性,但背景噪声、近震振幅谱、近震接收函数、远震切向接收函数波形存在一定差异;由地表地震计得到的近震震级比井下地震计的大0.12,地表地震计到井下地震计之间的P波速度约为2 km/s。
    • 单晓琳; 徐长银; 张小飞; 邓明文; 刘青山
    • 摘要: 对于特定区域(79.70°—88.75°E,34.05°—36.25°N)内发生的近震,新疆且末国家数字地震台的数字波形记录显示的震相特征与其他区域不同。以该区发生的31个近震(震中距200—600 km)波形为研究对象,对比分析原始波形与短周期仿真波形的震相特征,并运用MATLAB软件,对波形记录进行短时傅里叶变换(STFT),分析时频变化特征。结果表明:特定区域的近震波形具有明显的远震面波特征;与P波相比,S波列的周期、振幅明显较大;S波发育不完整,能量衰减快;S波列及S波尾波以低频信号为主,频率分布范围在0.15—0.5 Hz。研究发现,该研究区近震波形出现的震相特征,与该区地质构造背景有关:地处青藏高原北缘,构造破碎;存在地表低速带,对高频信号具有吸收、过滤作用。
    • 宋晓燕; 郝美仙; 张晖; 褚福刚
    • 摘要: 对内蒙古测震台网2008年以来速报的346次地震(包括天然地震与爆破、塌陷)进行统计,以典型震例,分区域、分类别总结震相特征.在此基础上,讨论利用典型震例与波形互相关性在未来地震定位与震相精确识别方面应用的可能性,及利用非常规震相(sPn震相)准确测定震源深度的应用前景.通过以上分析,以期进一步提高内蒙古地震速报和编目工作质量.%By means of reanalyzing 346 native earthquakes (include natural earthquakes, blasting and collapse) within 30 km besides the border of Inner Mongolia from 2008, the phase characteristics and difficulty of identification are researched, the typical earthquake examples are picked out. The characteristics of earthquake phases are summarized and divided into regions and classifications. On that basis, the possibility of using typical earthquake cases and waveform intercorrelation in future seismic positioning and seismic phase recognition are discussed. And the application prospect of unconventional seismic phase, such as sPn, in the accurate measurement of source depth is also explored. The results of this study will further improve the quality of earthquake speed reporting and cataloguing, and provide effective learning materials for new people to learn the characteristics of seismic waveforms in the area.
    • 摘要: 近期猪价在15.5元附近震荡,市场整体供需两端短期难有起色.一方面猪价7.5元/500g猪价逼近部分养殖户养殖成本,压栏惜售压力仍在,另一方面,清明节过后,整体市场消费难有起色。中央收储1万t,虽然体量较小,更多的是对养殖心理影响,另外随着端午以及五一长假的来临,预计猪肉消费有望迎来阶段性好转,4月底猪价大概率震荡企稳。
    • 吕俊强; 李青梅; 赵卫东; 蔡新华; 陈春梅
    • 摘要: 宁夏十五数字地震观测台网自投入使用以来,积累了大量的地震数字波形.利用宁夏台网中震中距在 1 000 km范围内不同台站记录的 9次M≥3.0 地震的 sPn 与 Pn 震相进行分析、计算这些地震的震源深度.研究表明,利用 sPn与Pn震相的到时差计算地壳内近震深度的方法简捷、准确.%Focal depth,the vertical distance from an earthquake source to the ground (the epicen-ter),is one of the basic earthquake parameters and is one of the most difficult of the seismic pa-rameters to accurately determine.The accurate determination of the focal depth involves a series of important problems including a correct understanding of the earthquake preparation process, the earthquake mechanism,its geological structure,and the stress field.Since the fifteen stations of the Ningxia digital seismic observation network were officially established in 2009,a large vol-ume of digital seismic waveform data has accumulated,and much research work has been possi-ble.On the basis of previous studies,using the lag of the sPn and Pn phases,in this study,we calculated the focal depth of nine earthquakes with M≥3.0,which occurred in the area surround-ing Ningxia in recent years.The results of the sPn method are mainly dependent on the velocity model selection and precision of the seismic phase.We selected the approved and widely used Ningxia local velocity model.The Pn and sPn phases and reading accuracy are particularly impor-tant,because the initial amplitude of this type of wave phase is generally weak.As such,if there is an arrival time difference of 0.5~1 s,it may result in a calculation error of 1.5~3 km in the fo-cal depth.With the availability of multiple records of the sPn phase,using the averages of each calculation depth,it is possible reduce the error caused by the reading.Research shows that it is a relatively simple matter to accurately calculate the near-earthquake depth within the crust using the lag of the sPn and Pn phases.Determining the exact value of the focal depth can provide an important criterion in earthquake research with respect to the causal factors of the formation and structure of deep crustal activities.
    • 张莹莹; 安艳茹
    • 摘要: 利用四川台网近震波形资料,精确拾取初至震相,采用网格搜索法,通过调整震源深度来控制近台定位残差,给出芦山7.0级地震的震源深度.同时利用全球台网远震波形资料,给定震源位置利用Taup计算理论走时,通过拟合sP到时,验证近震给出的震源深度.通过和其他研究结果对比,结果表明:利用近震和远震相结合的方法分析给出的芦山地震的震源深度14 km的结果是合理的.在限定的较短时间内,利用近震结合远震判定地震深度的办法简单高效,可以很好的应用于速报工作中.
    • 刘哲; 孟晓春
    • 摘要: 关于震源深度误差问题有许多讨论,但一直也没有很好的统一的解决办法.结合目前的实际,对于区域台网记录到的浅源近震,多数是采用JOPENS-MSDP人机交互处理软件中的单纯型定位方法进行定位,直达波是参与定位的主体.本文通过对甘肃台网记录到的71个浅源近震进行分析,得到甘肃地区震中距与震源深度的比值和定位误差之间的统计关系.
    • 吕睿; 张正霞; 张蕙
    • 摘要: 利用山西数字测震台网波形记录资料,根据sPn震相,计算2010年1月24日山西河津4.8级地震、2013年2月22日山西大同4.0级地震的震源深度。测得结果与山西省地震局编目结果、中国地震局编目结果对比基本一致,认为sPn震相分析准确,所测结果较为可靠,在实际工作中可为监测预报提供更为精确的地震参数指标。%By using the waveform records of Shanxi digital seismic network ,focal depths of Hejin 4 .8 earthquake on January 24 , 2010 and Datong 4 .0 earthquake on February 22 ,2013 are calculated by sPn phase .The results are consistent with the catalogue re‐sults of Earthquake Administration and China Earthquake Administration .Therefore ,it is considered that the sPn phase analysis is accurate and the results are reliable .In practice ,it can provide more accurate seismic parameters for monitoring and prediction .
    • 汤倩
    • 摘要: 震源深度是地震学中最难准确测定的参数之一,各种方法对于震源深度的估计都具相当程度的不确定性,地震速报要求又快又准的测定震源深度,加深了测定的难度.从近震地震波的震相结构特征、地震波的散射对近震地震波的影响和震源深度对P波和S波到时差的影响提出一些快速简便易行的判断中源近震的方法.
    • 蔡一川; 王宇航
    • 摘要: 通过对2008年1月至2013年10月四川省长宁地区ML≥3.5的20个近震重新进行分析后发现,在ML≥4.0时,该地区近震面波发育,ML 震级略大于MS 震级;100~160 km以内的部分台站即可清晰记录到上地壳绕射波Pb,也可清晰记录到下地壳反射波PmP;在研究时间段内,该地区仅发生1次ML≥5.0地震,用波形记录测定出有两个不同的破裂点。%According to the seismic phase observation data of 20 near earthquakes of ML≥3. 5 occurred in Changn-ing area, Sichuan Province, between January 2008 and October 2013, we summarize the law of seismic wave pha-ses. In Changning area the seismic surface wave of near earthquakes are rich and the seismic magnitude determined from the body wave is slightly larger than the magnitude determined from surface wave. The seismic waves PmP re-fracted from the upper crust and lower crust interfaces are observed clearly by stations located within radius range from 100 to 180 km. During the study period,only one ML≥5. 0 earthquake occurred in the area,two epicenters were determined by the seismic wave form recording.
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