SEDIS IV型短周期自浮式海底地震仪数据校正方法
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摘要
利用15台SEDISIV型短周期自浮式海底地震仪在南海中、北部地壳深部结构调查中所获得的资料,探讨了海底地震仪数据校正的方法和校正后的效果,结果表明:使用该地震仪所获得的原始资料经过放炮时间、炮点坐标数据局部化、海底地震仪位置误差以及记录时间漂移4方面的校正后,数据更趋合理,误差显著降低。放炮时间的校正消除了时钟漂移和时间延迟的误差;炮点坐标数据局部化处理消除了炮点位置整体趋势性偏移的现象;试错法进行位置误差和记录时间的精细校正时,时间漂移的校正量值约为几个到十几个毫秒,位置校正的量值仅在几米到数百米之间,实测数据所绘曲线的形态和位置都与理论曲线十分吻合,可见校正后误差显著降低。
The Second Institute of Oceanography,SOA,has just carried out a marine seismic survey successfully for crustal and mantle structure in the middle-northern margin of the South China Sea,using 15 sets of ocean bottom seismometer(OBS) of short period auto-floating type imported from GeoPro GmbH,Germany.The seismic data correction methods are described in detail,including shot time,shot location,OBS coordinate and recording time.The result shows that several kinds of errors are reduced noticeably,establishing the base of accurate inversion:the shot time correction eliminates clock drift of the computer and delay time;developed least square regression,trend migration of shot location data is diminished;curve of primary arrival matches well with the theoretical curve as an application of trial-and-error procedure,at the same time,actual time and location approach to the truth better.
The Second Institute of Oceanography,SOA,has just carried out a marine seismic survey successfully for crustal and mantle structure in the middle-northern margin of the South China Sea,using 15 sets of ocean bottom seismometer(OBS) of short period auto-floating type imported from GeoPro GmbH,Germany.The seismic data correction methods are described in detail,including shot time,shot location,OBS coordinate and recording time.The result shows that several kinds of errors are reduced noticeably,establishing the base of accurate inversion:the shot time correction eliminates clock drift of the computer and delay time;developed least square regression,trend migration of shot location data is diminished;curve of primary arrival matches well with the theoretical curve as an application of trial-and-error procedure,at the same time,actual time and location approach to the truth better.
引文
[1]阮爱国,李家彪,冯占英,等.海底地震仪及其国内外发展现状[J].东海海洋,2004,22(2):19—27.
[2]CHEN A T,NAKAMURA Y,WU Li-wei.Ocean Bottom Seis-mograph:Instrumentation and Experimental Technique[J]Ter-restrial,Atmospheric and Oceanic Scienses,1994,5(1):109-119.
[3]游庆瑜,刘福田,冉崇荣,等.高频微功耗海底地震仪研制[J].地球物理学进展,2003,18(1):173—176.
[4]邵安民,张玉云,赵风文.海底地震数据记录器[J].地球物理学报,2003,46(2):224—228.
[5]DIGRANES P,MJELDE R,KODAIRA S,et al.A regional shear-wave velocity model in the central V!ring Basin,N.Norway,using three-component ocean bottom seismographs[J].Tectono-physics,1998,293:157—174.
[6]阎贫,刘昭蜀,姜绍仁.东沙群岛海域的折射地震探测[J].海洋地质与第四纪地质,1996,16(4):19—24.
[7]阎贫,刘昭蜀,姜绍仁.南海北部地壳的深地震地质结构探测[J].海洋地质与第四纪地质,1997,17(2):21—27.
[8]丘学林,周蒂,夏戡原,等.南海西沙海槽地壳结构的海底地震仪探测与研究[J].热带海洋,2000,19(2):9—18.
[9]丘学林,施小斌,阎贫,等.南海北部地壳结构的深地震探测和研究新进展[J].自然科学进展,2003,13(3):231—236.
[10]丘学林,赵明辉,叶春明,等.南海东北部海陆联测与海底地震仪探测[J].大地构造与成矿学,2003,27(4):295—300.
[11]赵明辉,丘学林,叶春明,等.南海东北部海陆联测与滨海断裂带两侧地壳结构分析[J].地球物理学报,2004,47(5):845—852.
[12]赵明辉,丘学林,夏戡原,等.南海东北部海陆联测地震数据处理及初步结果[J].热带海洋学报,2004,23(1):58—63.
[13]周龙泉,刘福田,刘劲松,等.利用I-P波场反演法确定东沙群岛的地壳速度模型[J].地球物理学进展,2005,20(2):503—506.
[14]YAN Pin,ZHOU Di,LIU Zhao-shu,et al.A crustal structure profile across the northern continental margin of the South China Sea[J].Tectonophysics,2001,338:1—21.
[15]QIUXue-lin,YE San-yu,WUShi-min,et al.Crustal structure across the Xisha Trough northwestern South China Sea[J].Tectonophysics,2001,341:179—193.
[16]夏戡原,周蒂,苏达全,等.莺歌海盆地速度结构及其对油气勘探的意义[J].科学通报,1998,43(4):361—367.
[17]WANG Tan K,CHEN Ming-kai,LEE Chao-Shing,et al.Seismic imaging of the transitional crust across the northeastern margin of the South China Sea[J].Tectonophysics,2006,142:237—254.
[18]阎贫.海底地震仪记录中的横波[J].海洋地质与第四纪地质,1998,18(1):115—118.
[19]李湘云,吴振利,薛彬,等.SEDIS IV型短周期自浮式海底地震仪及应用体会[J].热带海洋学报,2007,26(5):35—39.
[2]CHEN A T,NAKAMURA Y,WU Li-wei.Ocean Bottom Seis-mograph:Instrumentation and Experimental Technique[J]Ter-restrial,Atmospheric and Oceanic Scienses,1994,5(1):109-119.
[3]游庆瑜,刘福田,冉崇荣,等.高频微功耗海底地震仪研制[J].地球物理学进展,2003,18(1):173—176.
[4]邵安民,张玉云,赵风文.海底地震数据记录器[J].地球物理学报,2003,46(2):224—228.
[5]DIGRANES P,MJELDE R,KODAIRA S,et al.A regional shear-wave velocity model in the central V!ring Basin,N.Norway,using three-component ocean bottom seismographs[J].Tectono-physics,1998,293:157—174.
[6]阎贫,刘昭蜀,姜绍仁.东沙群岛海域的折射地震探测[J].海洋地质与第四纪地质,1996,16(4):19—24.
[7]阎贫,刘昭蜀,姜绍仁.南海北部地壳的深地震地质结构探测[J].海洋地质与第四纪地质,1997,17(2):21—27.
[8]丘学林,周蒂,夏戡原,等.南海西沙海槽地壳结构的海底地震仪探测与研究[J].热带海洋,2000,19(2):9—18.
[9]丘学林,施小斌,阎贫,等.南海北部地壳结构的深地震探测和研究新进展[J].自然科学进展,2003,13(3):231—236.
[10]丘学林,赵明辉,叶春明,等.南海东北部海陆联测与海底地震仪探测[J].大地构造与成矿学,2003,27(4):295—300.
[11]赵明辉,丘学林,叶春明,等.南海东北部海陆联测与滨海断裂带两侧地壳结构分析[J].地球物理学报,2004,47(5):845—852.
[12]赵明辉,丘学林,夏戡原,等.南海东北部海陆联测地震数据处理及初步结果[J].热带海洋学报,2004,23(1):58—63.
[13]周龙泉,刘福田,刘劲松,等.利用I-P波场反演法确定东沙群岛的地壳速度模型[J].地球物理学进展,2005,20(2):503—506.
[14]YAN Pin,ZHOU Di,LIU Zhao-shu,et al.A crustal structure profile across the northern continental margin of the South China Sea[J].Tectonophysics,2001,338:1—21.
[15]QIUXue-lin,YE San-yu,WUShi-min,et al.Crustal structure across the Xisha Trough northwestern South China Sea[J].Tectonophysics,2001,341:179—193.
[16]夏戡原,周蒂,苏达全,等.莺歌海盆地速度结构及其对油气勘探的意义[J].科学通报,1998,43(4):361—367.
[17]WANG Tan K,CHEN Ming-kai,LEE Chao-Shing,et al.Seismic imaging of the transitional crust across the northeastern margin of the South China Sea[J].Tectonophysics,2006,142:237—254.
[18]阎贫.海底地震仪记录中的横波[J].海洋地质与第四纪地质,1998,18(1):115—118.
[19]李湘云,吴振利,薛彬,等.SEDIS IV型短周期自浮式海底地震仪及应用体会[J].热带海洋学报,2007,26(5):35—39.
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