期刊文献+
共找到4篇文章
< 1 >
每页显示 20 50 100
Application of S-transform threshold filtering in Anhui experiment airgun sounding data de-noising 被引量:1
1
作者 Chenglong Zheng Xiaofeng Tian +2 位作者 Zhuoxin Yang Shuaijun Wang Zhenyu Fan 《Geodesy and Geodynamics》 2018年第4期320-327,共8页
As a relatively new method of processing non-stationary signal with high time-frequency resolution, S transform can be used to analyze the time-frequency characteristics of seismic signals. It has the following charac... As a relatively new method of processing non-stationary signal with high time-frequency resolution, S transform can be used to analyze the time-frequency characteristics of seismic signals. It has the following characteristics: its time-frequency resolution corresponding to the signal frequency, reversible inverse transform, basic wavelet that does not have to meet the permit conditions. We combined the threshold method, proposed the S-transform threshold filtering on the basis of S transform timefrequency filtering, and processed airgun seismic records from temporary stations in "Yangtze Program"(the Anhui experiment). Compared with the results of the bandpass filtering, the S transform threshold filtering can improve the signal to noise ratio(SNR) of seismic waves and provide effective help for first arrival pickup and accurate travel time. The first arrival wave seismic phase can be traced farther continuously, and the Pm seismic phase in the subsequent zone is also highlighted. 展开更多
关键词 S transform Time-frequency filtering airgun data Threshold filtering DE-NOISING
原文传递
Study on the Deconvolution Method and Processing Flow of Airgun Source Data 被引量:1
2
作者 Zhai Qiushi Yao Huajian Wang Baoshan 《Earthquake Research in China》 CSCD 2016年第3期394-404,共11页
With its high repeatability,the airgun source has been used to monitor the temporal variations of subsurface structures. However,under different working conditions,there will be subtle differences in the airgun source... With its high repeatability,the airgun source has been used to monitor the temporal variations of subsurface structures. However,under different working conditions,there will be subtle differences in the airgun source signals. To some extent,deconvolution can eliminate changes of the recorded signals due to source variations. Generally speaking,in order to remove the airgun source wavelet signal and obtain the Green's functions between the airgun source and stations,we need to select an appropriate method to perform the deconvolution process for seismic waveform data. Frequency domain water level deconvolution and time domain iterative deconvolution are two kinds of deconvolution methods widely used in the field of receiver functions,etc. We use the Binchuan( in Yunnan Province,China) airgun data as an example to compare the performance of these two deconvolution methods in airgun source data processing. The results indicate that frequency domain water level deconvolution is better in terms of computational efficiency;time domain iterative deconvolution is better in terms of the signal-to-noise ratio( SNR),and the initial motion of P-wave is also clearer. We further discuss the sequence issue of deconvolution and stack for multiple-shot airgun data processing. Finally,we propose a general processing flow for the airgun source data to extract the Green 's functions between the airgun source and stations. 展开更多
关键词 Artificial source airgun source DECONVOLUTION data processing flow
下载PDF
云南宾川地震信号发射台的流动观测数据服务系统及数据质量评估 被引量:9
3
作者 张云鹏 李孝宾 +4 位作者 王伟涛 王宝善 叶泵 杨军 王彬 《地震研究》 CSCD 北大核心 2017年第4期525-533,共9页
对2011年以来云南宾川地震信号发射台的实验数据进行规范化处理,整理原始Reftek数据库,构建为统一的G1数据库(Mini SEED格式),并提供SAC等数据格式的截取服务。对台站分布及数据连续性、各台站仪器类型及经纬度位置变更情况、气枪激发... 对2011年以来云南宾川地震信号发射台的实验数据进行规范化处理,整理原始Reftek数据库,构建为统一的G1数据库(Mini SEED格式),并提供SAC等数据格式的截取服务。对台站分布及数据连续性、各台站仪器类型及经纬度位置变更情况、气枪激发时刻与集中加密实验、台站背景噪声水平等进行数据质量评估,并对宾川附近天然地震分布进行了统计分析。结果表明:G1数据库是对历史数据的检验,格式与信息均可达到统一,也可作为新疆、甘肃等地主动源数据整理的模板。 展开更多
关键词 大容量气枪 地震信号 G1数据库 数据质量评估 云南宾川
下载PDF
气枪阵列延迟激发技术探讨 被引量:17
4
作者 全海燕 陈小宏 +3 位作者 韦秀波 郭毅 罗敏学 宋翔宇 《石油地球物理勘探》 EI CSCD 北大核心 2011年第4期513-516,667+491-492,共4页
在深海拖缆地震勘探中,广泛应用气枪阵列组合。组合激发方式可压制因震源产生的虚反射波。本文利用不同深度气枪子阵列组合并采用延迟激发方式,压制虚反射、改善气枪激发子波的特性及激发子波的信噪比。文中理论模拟和实际资料分析表明... 在深海拖缆地震勘探中,广泛应用气枪阵列组合。组合激发方式可压制因震源产生的虚反射波。本文利用不同深度气枪子阵列组合并采用延迟激发方式,压制虚反射、改善气枪激发子波的特性及激发子波的信噪比。文中理论模拟和实际资料分析表明,采用气枪阵列延时激发技术在一定程度上拓展了气枪子波频谱,对提高低频和高频成分能量均有一定效果。 展开更多
关键词 气枪阵列 延迟激发 海上地震数据采集 激发方式 近场子波 远场子波
下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部