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| 1 | 大容量气枪震源及其波形特征显示文摘大容量低频组合气枪震源已成功应用于南海北部海陆联测实验及陆上水库实验,其信号传播最远距离可达255km.为了探讨气枪信号的波形特征,从广东省地震台网数据中选择了台基相同、震级与震中距相近的珠海台的地震记录,将气枪震源、天然地震和爆破三种震源的波形特征进行了对比分析,结果表明,气枪信号特征明显,信号主频4~8Hz,振幅±0.15μm·s^-1,波形一般具有3~5个峰值,并随时间有规律变化,易于准确识别.实验探测结果说明,这种能量强、重复性好、探测精度高、绿色环保的枪阵组合震源可广泛应用于海洋与陆地深部结构研究. | 赵明辉 丘学林 夏少红 王平 徐辉龙 叶春明 康英 | 2008 | 地球物理学报2008，51，2： | 53 |
| 2 | 人工震源地下介质变化动态监测显示文摘成像地球内部介质结构及其动态变化是地球物理学家的主要任务。相对于对地球介质静态结构的认识,对于地下介质性质随时间变化的了解明显不足。近年来随着观测资料的增加,已经开始利用重复地震和噪声等震源研究地下介质变化。受到源位置和时间等因素制约,基于地震和噪声等被动震源的观测结果的时间和空间分辨率有限。利用人工震源主动向地下发射地震波,进行地下介质监测自然成为一个重要的发展方向。系统地介绍了国内外利用人工震源进行不同尺度地下介质变化监测的研究,分析了不同震源的优缺点。根据分析和对比结果,认为在进行地下介质变化研究方面,气枪震源要优于其他震源。还介绍了相关的数据处理方法,包括互相关延时估计,尾波干涉和信号叠加等。目前用于大尺度地下动态监测的震源,接收和数据处理等主要技术已经基本发展成熟,利用人工震源进行地下介质大尺度监测成为可能,相关研究在减轻自然灾害和资源探查等领域具有广阔的应用前景。 | 王宝善 王伟涛 葛洪魁 徐平 王彬 | 2011 | 地球科学进展2011，26，3： | 48 |
| 3 | Magnetic recording of the Cenozoic oceanic crustal accretion and evolution of the South China Sea basin显示文摘我们考察并且讨论一些在华南海(SCS ) 在磁性的数据上做的最近的科学调查结果。磁性的异例在中生代和新生代上忍受极其富有的信息构造进化。从磁性的异例计算的分析信号振幅很精确揭示的 3D 二上的中生代沉积序列的寡妇分布结合大陆人边缘,和他们也在在 SCS 海洋的外壳以内描绘以后阶段的 magmatism 和构造转变和带状配列被发现很有效。通过综合分析磁性,严肃和思考地震数据,我们在华南海大陆人边缘附近定义大陆海洋边界(圆块) ,并且发现圆块与一个转变地区与一致很好从对否定免费空气的严肃异例主要积极。COB 的这精确构画出为更好跟踪海洋的外壳导致的磁性的异例是批评的。几何上复杂的圆块和内部磁性的带状配列要求一个阵发性的洞模型,以及一个变换差错的介绍(这里作为 Zhongnan 差错制造了)在东方和西南亚盆之间在东方和西南亚盆以内,磁性的异例旁边地是相当连续的,在这些亚盆以内显示大变换差错的不存在。我们提高浅玄武岩的层经由一个通带过滤器引起的磁性的异例,并且认识到北大陆人边缘附近的多半最旧的磁性的异例根据磁性的时间规模 CK95 是 C12。在南部的大陆人边缘附近,磁性的异例是不太可认识的,异例 C12 看起来失踪。这些差别证明关于散布中心的寡妇的一种不均匀的开始式样,和北部分看起来比到南方有稍微更快传播的率。磁性的异例 C8 (M1 和 M2, 26 妈) 在海洋的盆以内代表重要磁性的边界,并且可能与在散布率和 magmatic 紧张的变化有关。为一条以前建议的山脉的磁性的证据在异例 C7 不是清楚的以后,跳。西南亚盆的年龄还得进一步被检验,最有利地与深拖引磁性的调查并且海洋钻。我们的磁性光谱最浅的居里削尖的学习表演在西南的亚盆的东方部分附近被定位,而在东方亚盆居里以内深度对传播的寡妇的北方更小,比到南方集中。居里深度的这个模式对地区性的热流动大小和以后阶段的暴烈的海底山分布一致,并且我们因此推想居里深度变化仔细与以后阶段的 magmatism,而非与外壳的年龄被联系。尽管在北大陆海洋转变地区(简易窄床) 附近定位的磁性的异例是相对安静的,自从概念上它与一个海洋的磁性的安静地区显著地不同,这个区域不是一个典型磁性的安静地区。相对安静的磁性的异例看起来在居里等温线与 shallowing 被联系并且在磁性的层,而是我们的全面观察变瘦建议保存得很好的厚中生代沉积岩石是为有磁力地安静的地区的主要原因。各种各样的低通行证的过滤水兵和在空中的磁性的异例和卫星的高类似磁性的异例清楚地证实那更深磁性的来源(在更低的外壳中并且最高披风) 有贡献到长波长的表面在区域的磁性的异例,当已经推断了从有磁力地 inversed 居里深度。近海华南磁性的异例(SCMA ) 在低通行证的过滤水兵和在空中的磁性的异例和卫星上变得更突出磁性的异例,在它下面显示很深深地埋葬的磁性的来源。 | LI ChunFeng SONG TaoRan | 2012 | Chinese Science Bulletin2012，57，24： | 40 |
| 4 | 西南印度洋中脊三维地震探测中炮点与海底地震仪的位置校正显示文摘在海上实施三维地震探测过程中,人工震源枪阵中心与船上GPS的距离及地震探测作业中的船行方向造成炮点实际位置与预设位置有一定偏差;自由落体投放的OBS由于海流的影响会偏离原定设计位置(投放点),因此,炮点与海底地震仪(OBS)的位置校正是三维地震结构研究中的基本环节.本文利用艏向信息校正了炮点位置;采用蒙特卡洛和最小二乘法方法对海底地震仪的位置进行了校正,并探讨了直达水波曲线特征.结果表明OBS位置一般偏离设计点1km左右,其误差范围在20m以内,校正后的OBS记录剖面展示了真实的记录情况.该研究结果为下一步西南印度洋的三维层析成像研究提供了坚实数据基础,同时为今后南海的三维深部地壳结构探测提供经验与借鉴. | 敖威 赵明辉 丘学林 李家彪 陈永顺 阮爱国 李守军 张佳政 吴振利 牛雄伟 | 2010 | 地球物理学报2010，53，12： | 31 |
| 5 | 南海西北次海盆及其邻区地壳结构和构造意义显示文摘西北次海盆的深部地壳结构蕴含着南海北部陆缘拉张过程的重要信息.广角反射/折射测线(OBS2006-2)长386km,是目前唯一的一条沿NEE向穿过西沙地块、并平行于西北次海盆扩张脊的深地震测线.通过射线追踪与走时模拟方法(RAYINVR),获得了OBS2006-2测线下方的速度结构.结果表明:西沙地块的沉积层厚度约为1~2km,而西北次海盆的沉积层厚度大约为2~3km;Moho界面从西沙地块的27km逐步抬升到西北次海盆的12km,Moho界面下方的速度为7.8~8.0km/s;未发现壳内高速层和低速层.在西沙地块和西北次海盆的过渡区,有着较大量的岩浆活动信息,推测与西北次海盆的初始扩张有关.OBS2006-2测线中114.5°E以西的地区为减薄的陆壳,而114.5°E以东的地区为洋壳,莫霍面在陆壳与洋壳的结合处剧烈抬升,地壳厚度明显减薄.西北次海盆的扩张脊下方可能有残余岩浆的存在. | 敖威 赵明辉 丘学林 阮爱国 李家彪 | 2012 | 地球科学(中国地质大学学报)2012，37，4： | 28 |
| 6 | 南海中央次海盆OBS位置校正及三维地震探测新进展显示文摘南海中央次海盆首次开展的三维海底地震仪(ocean bottom seismometer,OBS)探测试验,对于全面认识南海扩张脊处速度展布特征及海底扩张历史有着重要意义.海底地震仪的位置是研究三维地震结构的关键参数之一,高精度的三维OBS数据处理,决定着后期地震结构反演模型的分辨率与准确性.利用直达水波走时信息,综合最小二乘法反演原理,并采用蒙特卡罗法模拟OBS降落海底的过程,完成了南海中央次海盆试验区39台OBS数据格式转换与位置校正工作;同时探讨了蒙特卡罗法应用于位置校正的精度问题.处理后OBS综合记录剖面中展示了多组清晰可靠、来自珍贝-黄岩火山链下深部结构中的波震相,如、和震相。 | 张莉 赵明辉 王建 贺恩远 敖威 丘学林 徐辉龙 卫小冬 张佳政 | 2013 | 地球科学(中国地质大学学报)2013，38，1： | 27 |
| 7 | A new way to generate seismic waves for continental crustal exploration显示文摘An airgun experiment was conducted in a reservoir,with the total volume of the airgun array being 6000 cubic inch. The energy released by one excitation was estimated to be 6.68×106 J,which corresponded to a 3.4 kg TNT explosion. A 180 km long profile composed of 100 portable short period seismometers was deployed as a receiver system of the airgun signals. Two remarkable results can be drawn from the experiment: (1) the airgun explosion is harmless to the dam and the fish,and this kind of airguns can be regarded as a green and environmental protection seismic source on land; (2) seismic wave gener-ated by this airgun source can be recorded by permanent stations with offset larger than 200 km. And the wave amplitudes recorded by nearby and remote stations are equivalent to the wave generated by 800 kg dynamite explosion. The airguns can be used as a light to illuminate the continental crustal structure of an area of about 100000 km2. | CHEN Yong ZHANG XianKang QIU XueLin GE HongKui LIU BaoJin WANG BaoShan | 2007 | Chinese Science Bulletin2007，52，16： | 24 |
| 8 | Influencing factors of seismic signals generated by un-tuned large volume airgun array in a land reservoir显示文摘Un-tuned large volume airgun array in a water reservoir is recently proposed as a new way to generate seismic waves on land. It can be used to explore the earth velocity structure and its temporal variations as well.However, the characteristics of seismic signals(especially far-field signals) from an airgun array in a reservoir and its affecting factors(firing pressure, airgun towing depth,water level of the reservoir, etc.) has not been adequately studied. We analyzed the seismic data collected from field experiments at Binchuan Transmitting Seismic Station in2011 and 2013 and found that(1) The similarity of seismic signals decrease with distance, which is most likely induced by the decay of signal amplitude and signal to noise ratio(SNR);(2) The amplitudes of far-field airgun signals are almost linearly proportional to the firing pressure;(3) The towing depth of airgun has less effects on the far-field signals;(4) The amplitudes of far-field airgun signals are proportional to the water level of the reservoir. | Meng Chen Wei Yang Weitao Wang Baoshan Wang Hongkui Ge Li Chen Yansheng Ding Jiyan Qiao Yong Chen | 2014 | Earthquake Science2014，27，4： | 19 |
| 9 | 南海西沙地块岛屿地震观测和海陆联测初步结果显示文摘为了研究南海西沙地块下方的地壳结构,我们在岛屿区架设了流动地震台站进行天然地震观测和海底地震仪的人工地震探测.本文利用远震接收函数方法和射线追踪方法对琛航台的远震数据和海陆联测数据进行了初步处理和分析,建立了琛航岛下方的一维横波速度模型以及横穿琛航岛的二维地壳结构模型.琛航岛顶部存在2 km厚的新生代低速沉积层,下地壳存在明显低速层,横波速度只有3.5 km/s,莫霍面埋深24~26 km,岛屿两侧地壳厚度向外逐渐变薄,其西北侧地壳结构表现为裂谷特征,可能为西沙海槽在该地区的延伸表现.地幔热活动和区域拉张应力作用引起的上地幔物质的韧性流变构造和各向异性排列可能是产生下地壳低速层的主要原因. | 黄海波 丘学林 徐辉龙 赵明辉 郝天姚 胥颐 李家彪 | 2011 | 地球物理学报2011，54，12： | 18 |
| 10 | 立体气枪阵列延迟激发震源特性及在浅海区OBS探测中的应用显示文摘利用中、小容量气枪组成的立体气枪阵列延迟激发震源和海底地震仪(OBS)在我国北部浅海海域开展了人工地震深部地球物理探测试验.基于水深条件和压制水体虚反射、提升低频能量的需要,使气枪震源有足够的输出能量和高品质子波特性,研究了立体气枪阵列延迟激发震源工作机理,经远场子波理论模拟优选了组合参数并进行了海上试验工作.结果表明,中、小容量气枪组成的立体气枪阵列延迟激发震源,适应了浅水海域的激发环境,降低了由虚反射造成的局部陷波和干扰作用,有效地改善了OBS信号的品质,获得了Ps,Pg,PmP,Pn等多种震相.创新了由中、小容量气枪组成的立体气枪阵列延迟激发震源在浅海区OBS探测中的应用,也填补了南黄海海域深地震探测数据的空白,为南黄海、渤海深部地壳结构研究及含油气盆地形成演化研究提供了重要的基础资料. | 吴志强 郝天珧 唐松华 张训华 郑彦鹏 肖国林 赵维娜 | 2016 | 地球物理学报2016，59，7： | 13 |
| 11 | Joint land-sea seismic survey and research on the deep structures of the Bohai Sea areas显示文摘This paper presents the survey and research work of two land-sea profiles in the Bohai Sea,China,carried out in 2010–2011,including the seismic sources on land and in the sea,the ocean bottom seismographs(OBS)and their recovery,the coupling of OBS and the environment noise in sea area,the data quality of OBSs,and the result of data analysis.We focused on the investigation of crustal structures revealed by the two NE\EW-trending joint land-sea profiles.In combination with the Pn-velocity distribution and gravitymagnetic inversion results in the North China Craton,we propose that the undulation of the Moho interface in the Bohai and surrounding areas is not strong,and the lithospheric thinning is mainly caused by the thinning of its mantle part.The research result indicates that obvious lateral variations of Moho depth and seismic velocity appear nearby all the large-scale faults in Bohai Sea,and there is evidence of underplating and reforming of the lower crust by mantle material in the Bohai area.However,geophysical evidence does not appear to support the'mantle plume'or'delamination'model for the North China Craton destruction.The crustal structure of the Bohai Sea revealed'a relatively normal crust and obviously thinned mantle lid',local velocity anomalies and instability phenomena in the crust.These features may represent a combined effect of North China-Yangtze collision at an early stage and the remote action of Pacific plate subduction at a late stage. | HAO Tianyao YOU Qingyu LIU Lihua LV Chuanchuan XU Ya LI Zhiwei ZHAO Chunlei ZHENG Yanpeng LIU Chenguang HAN Guozhong | 2013 | Acta Oceanologica Sinica2013，32，12： | 11 |
| 12 | Passive seismic experiment and ScS wave splitting in the southwestern subbasin of South China Sea显示文摘The seismic experiment of 3D array of OBS in the southwestern sub-basin of the South China Sea(SCS) is briefly introduced in this paper.The data analysis of broadband OBS shows that totally 93 earthquakes with magnitude of Ms 6.0-6.9 and 10 earthquakes with magnitude above Ms 7.0 were recorded in high quality during this experiment,especially the catastrophic earthquake Ms 9.0 occurred in the east sea area of Japan on March 11,2011.The anisotropy parameters inversion of ScS wave of four events above Ms 7.0 indicates that the fast direction of shear wave is N58°E parallel to the ceased spreading ridge of the southwestern sub-basin of SCS(the slow direction is S35°E perpendicular to the spreading ridge),which means the spreading ridge is under compressing stress at present and the cessation of seafloor spreading is related to such stress field as well. | RUAN AiGuo LI JiaBiao LEE ChaoShing QIU XueLin PAN ShaoJun | 2012 | Chinese Science Bulletin2012，57，25： | 9 |
| 13 | 大容量气枪震源在南黄海海相高速屏蔽层下VSP资料采集中的应用——以大陆架科学钻探CSDP-2井为例显示文摘CSDP-2井为南黄海盆地中部隆起第一口以探查南黄海海相地层属性的科学钻探井,为了建立地震层位与钻井地层界面两者准确的对应关系,实施了垂直地震剖面(VSP)测井.针对浅部存在速度突变界面对地震波能量屏蔽作用严重的难题,根据大容量气枪激发的地震信号主频低、穿透能力强的优势,采用了4支容量为1500 in3的Bolt气枪,组合设计形成总容量6000 in3的气枪阵列,作为VSP资料采集的地震激发震源.在较小的井源距条件下,解决了海相地层顶部高速屏蔽层对地震波的强烈阻滞问题,获得了井孔内高信噪比的纵波波场信号特征,并得到了高速屏蔽层之下的有效转换波信号,为地震层位与钻井地层的关系建立、地层弹性波速度提取提供了良好的数据基础,而且为推广VSP观测与大容量气枪联合应用提供了经验与借鉴. | 祁江豪 吴志强 郭兴伟 丘学林 贺恩远 | 2019 | 地球物理学进展2019，34，4： | 6 |
| 14 | 大陆架科学钻探CSDP-2井的垂直地震剖面测量显示文摘南黄海海相地层的地震波场特征和层位标定一直是困扰地震勘探的重要问题.为了近距离、高精度和高分辨率地观测井周围构造特征和岩石性质引起的波场变化,为地震资料的采集、处理与解释提供地震波衰减规律、速度与层位标定等信息,对大陆架科学钻探CSDP-2井实施了近零偏移距垂直地震剖面(VSP)观测.针对海相地层顶部强反射界面地震波穿透难的问题,采用了大容量气枪震源并设计了气枪阵列组合方式,提高了激发地震波的能量,获得了强反射界面之下清晰的PP、PS下行波和上行波信号.采用了三分量偏振合成、组合滤波和波场分离等处理方法,对VSP观测数据进行处理,获得了海相三叠系-志留系的精细的纵波、横波速度结构和地层吸收因子等物性数据,建立了钻井地层、测井、VSP上行波和多道地震剖面对应关系,实现了不同尺度的地质和地球物理属性资料的有效衔接,标定了钻井地质剖面上各深度地质体的地震反射特性,厘定了过井地震剖面上反射同相轴的地质属性.此次观测取得的纵波、横波速度信息,成为建立南黄海海相地层速度模型主要的资料来源,也是地震资料的岩性反演处理不可缺少的信息. | 吴志强 祁江豪 张训华 郭兴伟 丘学林 张雪飞 谭云龙 黄聿晓 李文强 庞玉茂 | 2019 | 地球物理学报2019，62，9： | 5 |
| 15 | Regional Scale Seismological Investigation on the Continent Crust Using Airgun Sources——A Perspective Review显示文摘The investigations on the structure and temporal variations of the continent crust have been the long-lasting topics of seismology. The artificial sources play the most important role in these studies for their well-known locations and occur times among all the sources producing elastic waves,so that precise results are obtained. In past decades,we have successfully excited the airgun sources in on-land water bodies such as reservoirs,expanding their applications in marine seismology. Large volume airguns have been used to produce low frequency signals which can travel hundreds of kilometers after stacking,providing a source connecting the exploration seismology and traditional seismology at regional scale. In this review,we introduce the changes through which we turn the airgun into scientific instruments by experiments. We also present the advances on imaging the continental crust structure and monitoring the velocity variations using the highly repeatable signals emitted by airgun sources. The potential applications such as imaging the subsurface of urban areas and high resolution illuminating of mines are proposed and the challenges for further investigations are also discussed. | Wang Weitao Wang Baoshan Jiang Shengmiao Hu Jiupeng Zhang Yuansheng | 2018 | Earthquake Research in China2018，32，3： | 5 |
| 16 | Using Airgun Source Signals to Study Regional Wave Velocity Changes before and after the Yunlong M_S5.0 and Yangbi M_S5.1 Earthquakes显示文摘On the basis of the airgun source signals recorded by the stations from January,2016 to June,2017,we use cross-correlation detection technology to obtain the characteristics of the stable phase travel time change of each station.We used the Yunlong MS5.0 and Yangbi MS5.1 earthquakes as samples.According to regional characteristics,13 stations with high signal-to-noise ratios and complete data were selected(including 3 fixed stations and 10 active source stations).They are divided into four regions,and on the basis of the GNSS baseline data,the characteristics of regional wave velocity changes before and after the earthquake are analyzed.The results show that the station phase travel time change and the regional stress characteristics represented by the GNSS baseline data have good correlation in the short-term.Due to different degrees of regional stress,there are differences in the travel time changes of different stations in the four regions.Before the Yunlong MS5.0 and Yangbi MS5.1 earthquakes,with regional stress adjustment,there is an upward trend in the travel time changes of related stations in the adjacent areas of up to 0.02 s.The difference is that there are differences in the time nodes and duration of the travel time anomalies,and there is a reverse descent process after the Yangbi MS5.1 earthquake.There are different degrees of travel time fluctuations in the relevant stations before and after the two earthquakes,but the fluctuation range before and after the earthquake was small.Compared with the water level change of the reservoir,the adjustment of the regional stress is more likely to have a substantial impact on the travel time changes of the relevant stations. | YANG Jianwen LI Lei ZHANG Pengying YE Beng HE Yingwen CHEN Jia CHA Wenjian | 2019 | Earthquake Research in China2019，33，2： | 4 |
| 17 | Preface to the Special Issue on Advances in Seismic Exploration and Monitoring with Active Sources in China显示文摘Analyzing the information carriede by seismic waves is a major means for human beings to have an insight into the structure of the earth’s interior,and by using artificial seismic sources to excite seismic waves,we can obtain high-resolution images for the crustal and smaller scale medium.Artificial seismic exploration methods have been widely applied to fields such as | Chen Yong Wang Baoshan | 2016 | Earthquake Research in China2016，30，3： | 3 |
| 18 | Preliminary Results of Tomography from Permanent Stations in the Anhui Airgun Experiment显示文摘In order to explore the ability of airgun sources in imaging the crustal structure,we conducted an experiment along the Yangzte River at the section from Ma 'anshan to Anqing using an offshore airgun source( referred as the Anhui Airgun Experiment).During the experiment,the airgun source was fired 2973 times at 20 multiple shot points,while 109 permanent stations and 700 temporary stations( 11 profiles) were used to record the signal. For 20 multiple shot points,we picked up 335 P-wave arrivals at 52 permanent stations. Then we obtained the P-wave velocity structure of the crust beneath the southern tip of the Tancheng-Lujiang( Tan-Lu) fault. The preliminary result of P-wave velocity structure confirms the possibility of 3D body wave imaging using large volume airgun sources. The imaged velocity heterogeneity at a depth of 15 km is correlated to the geological settings. High velocity anomaly beneath the Qinling-Dabie orogenic belt could be explained by the ultrahigh-pressure metamorphic rocks in the deep region,while the low velocity anomaly at the Yangtze River region may correspond to the special background of mineralization. | Zhang Yunpeng Wang Baoshan Wang Weitao Xu Yihe | 2016 | Earthquake Research in China2016，30，3： | 3 |
| 19 | Study on the Influence of Airgun Excitation Conditions on Airgun Signals and Travel Time Variation Measurements显示文摘Because of the different excitation conditions of the airgun source,there will be subtle differences in airgun signals.Travel time variation of airgun signals often mix into source information which can’t fully reflect the evolution of the medium.This article uses the airgun signals from the Binchuan Transmitting Seismic Station to analyze the airgun signal′s characteristics of phase and correlation.We conducted a comparative analysis of the effects of the pair difference method and the deconvolution method on eliminating the influence of the excitation conditions in travel time variation.The results show that:(1)The pressure pulse and its subsequent wave of airgun source wavelet are less affected by excitation conditions that we can use it to obtain high-precision excitation moments.(2)Deconvolution can improve the correlation of the airgun signal.(3)The pair difference method can’t eliminate the influence of excitation conditions in travel time variation.Deconvolution can reduce excitation condition interference and the influence of the excitation condition in the travel time variation after deconvolution of the vertical signal is significantly reduced. | XIANG Ya YANG Runhai WANG Bin ZHOU Yunyao LU Yongqing WU Huan QI Junwei PENG Jing | 2019 | Earthquake Research in China2019，33，2： | 3 |
| 20 | 大容量气枪震源广角地震数据的高频成分分析显示文摘大容量气枪震源由于能量集中在低频段、子波一致性好、绿色环保等优点,广泛应用于广角地震探测中,极大地推进了人们对地壳结构和地球动力学过程的认识.气枪信号的有效频带是地震数据质量评价和精细处理一个重要基础参数,以往研究由于数据源和研究方法的局限,认为最高有效频率在10 Hz以下.本文基于福建省地震局采集的大容量气枪源广角地震数据,根据地震道褶积模型分析了有效频带及其影响因素,对不同类型、不同台基条件的地震接收仪器记录的大容量气枪信号数据进行了分频扫描,结果显示台基条件较好的台站数据,在10~20 Hz频段仍有较高的信噪比,说明大容量气枪激发的地震波在经过深部地层衰减后,仍存在相当可观的高于10 Hz的成分.这些高频成分可以显著提升地震信号的倍频程,减少频带过窄带来的旁瓣效应等不利影响,是准确提取走时的必要条件.值得注意的是大容量气枪源数据中PmP震相的主频可达10~12 Hz,显著高于震源子波的主频,据此推断Moho面的广角反射系数有显著的蓝谱特征,因此10 Hz以上成分对准确提取走时、获取更为精细的地壳结构非常重要.本研究对大容量气枪源广角地震探测的野外采集和数据处理提供了关键质量指标,同时提出从构造反演向岩性反演推进是广角地震探测一个重要的研究方向. | 王笋 丘学林 郭晓然 赵明辉 李普春 | 2019 | 地球物理学进展2019，34，1： | 3 |
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