海南地区Pb震相的识别及康拉德面的确定
|
摘要
选取海南省地震台网2009年1月1日至2016年8月25日记录到的281次ML≥2.0地震,利用PTD方法重新定位其震源深度,采用折合走时分析海南Pb震相,并对Pb震相的速度拟合进行佐证,进而确定海南岛Pb震相的存在。结果显示,从其中的52次地震事件中可识别出57个Pb震相,其相速度为6.68 km/s,在此基础上以地震波走时方程反演得到的海南地区康拉德面的平均深度为21 km。
This paper selected 281 earthquakes with ML≥2.0 from 1 January 2009 to 25 August 2016 recorded by Hainnan seismic networks,and relocated the focal depths of the earthquakes by using PTD method. And then the Pb phase in Hainan area were analyzed by using the reduced travel time and the Pb phase velocity fitting are corroborated. As a result, the Pb phases are identified in Hainan island. The results show that,57 Pb phases were identified from52 of the 281 seismic events with phase velocities 6.68 km/s. Based on inversion of seismic wave travel time equation, the average depth of Conrad 's discontinuity in Hainan area is determined to be 21 km.
This paper selected 281 earthquakes with ML≥2.0 from 1 January 2009 to 25 August 2016 recorded by Hainnan seismic networks,and relocated the focal depths of the earthquakes by using PTD method. And then the Pb phase in Hainan area were analyzed by using the reduced travel time and the Pb phase velocity fitting are corroborated. As a result, the Pb phases are identified in Hainan island. The results show that,57 Pb phases were identified from52 of the 281 seismic events with phase velocities 6.68 km/s. Based on inversion of seismic wave travel time equation, the average depth of Conrad 's discontinuity in Hainan area is determined to be 21 km.
引文
崇加军.2013.基于震相特征的地震成像方法和应用[D].合肥:中国科学技术大学地空学院:1-2.Chong J J.2013.Seismic Phase Characteristics Based Imaging Methods and Their Applications[D].Hefei:University of Science and Technology of China:1-2(in Chinese).
范玉兰,林纪曾,胡瑞贺,罗振暖.1990.华南地区近震走时表的研制[J].华南地震,10(2):1–16.Fan Y L,Lin J Z,Hu R H,Luo Z N.1990.The development of travel timetable for near earthquake in South China[J].South China Journal of Seismology,10(2):1–16(in Chinese).
郭杰,郑杰,吴静.2013.濮阳台地方震不明震相分析探讨[J].河南科技,(1):28–29.Guo J,Zheng J,Wu J.2013.Analysis and discussion of unknown phase in Puyang station in local earthquake[J].Journal of Henan Science and Technology,(1):28–29(in Chinese).
胡德昭,恽玲舲,姜永基,王良书,徐鸣洁.1989.中国东南部的壳内低速层与康拉德面[J].石油实验地质,11(4):331-340.Hu D Z,Yun L L,Jiang Y J,Wang L S,Xu M J.1989.On the low velocity layer and Conrad surface within the crust of southern parts of China[J].Petroleum Geology&Experiment,11(4):331-340(in Chinese).
黄海波,丘学林,夏少红.2012.海南岛地壳厚度与泊松比结构[J].热带海洋学报,31(3):65-70.Huang H B,Qiu X L,Xia S H.2012.Crustal structure and Poisson’s ratio beneath Hainan Island[J].Journal of Tropical Oceanography,31(3):65-70(in Chinese).
焦煜媛,沈旭章,李秋生.2017.青藏高原东北缘康拉德界面存在的地震学证据及构造意义初探[J].地球学报,38(4):469-478.Jiao Y Y,Shen X Z,Li Q S.2017.Seismic evidence of the Conrad discontinuity on the northeast margin of the Tibetan Plateau and a tentative discussion on its tectonic implications[J].Acta Geoscientica Sinica,38(4):469-478(in Chinese).
李志雄,雷建设,赵大鹏,武巴特尔,沈繁銮,丘学林.2008.海南岛及邻区地壳三维P波速度结构[J].地震学报,30(5):441-448.Li Z X,Lei J S,Zhao D P,Wu Bateer,Shen F L,Qiu X L.2008.3-D P-wave velocity structure of the crust beneath Hainan Island and adjacent regions[J].Acta Seismologica Sinica,30(5):441-448(in Chinese).
林建民,王宝善,葛洪魁,唐杰,张先康,陈颙.2008.大容量气枪震源特征及地震波传播的震相分析[J].地球物理学报,51(1):206-212.Lin J M,Wang B S,Ge H K,Tang J,Zhang X K,Chen Y.2008.Study on large volume airgun source characteristics and seismic phase analysis[J].Chinese Journal of Geophysics,51(1):206-212(in Chinese).
刘瑞丰,陈翔,沈道康,郑秀芬,杨辉,陈宏峰.2014.宽频带数字地震记录震相分析[M].北京:地震出版社:14-15.Liu R F,Chen X,Shen D K,Zheng X F,Yang H,Chen H F.2014.Seismic Phase Analysis of Broad-Band Digital Seismic Records[M].Beijing:Seismological Press:14-15(in Chinese).
刘赛君,曾钢平,丘学林,符干,吴世敏,叶三余,陈金海,Flueh E.2011.海南岛西南海域地壳剖面海陆联合探测研究[J].地球物理学进展,26(3):922-933.Liu S J,Zeng G P,Qiu X L,Fu G,Wu S M,Ye S Y,Chen J H,Flueh E.2011.The crustal profile and onshore-offshore seismic exploration in the marine area southwest to Hainan Island[J].Progress in Geophysics,26(3):922-933(in Chinese).
王莉婵,朱元清,李雪英,王铎,蔡玲玲,李冬圣,杨锐.2016.河北地区地壳一维速度模型的新近研究[J].华北地震科学,34(4):1-10.Wang L C,Zhu Y Q,Li X Y,Wang D,Cai L L,Li D S,Yang R.2016.Study on one-dimensional crustal velocity model in Hebei area[J].North China Earthquake Sciences,34(4):1-10(in Chinese).
杨配新,邓存华,刘希强,任勇,颜其中.2004.数字化地震记录震相自动识别的方法研究[J].地震研究,27(4):308-313.Yang P X,Deng C H,Liu X Q,Ren Y,Yan Q Z.2004.Studies on auto-distinguishing phase of digital seismic recordings[J].Journal of Seismological Research,27(4):308-313(in Chinese).
殷伟伟,李颖,赵永,李自红.2017.山西地区Pb震相识别及特征研究[J].地球物理学进展,32(1):95-100.Yin W W,Li Y,Zhao Y,Li Z H.2017.Study on identification and characteristics of the Pb phase in Shanxi area[J].Progress in Geophysics,32(1):95-100(in Chinese).
赵荣国.1999.震相分析是地震科学的心脏[J].地震地磁观测与研究,20(5):121-126.Zhao R G.1999.Phase analysis is the heart of seismology[J].Seismological and Geomagnetic Observation and Research,20(5):121-126(in Chinese).
朱元清,石耀霖,李平.1990.一种确定地震深度的新方法[J].地震地磁观测与研究,11(2):4-12.Zhu Y Q,Shi Y L,Li P.1990.A new method for determining the depth of earthquake[J].Seismological and Geomagnetic Observation and Research,11(2):4-12(in Chinese).
朱元清,夏从俊,李平.1997.确定震源深度的PTD方法及其应用[J].地震地磁观测与研究,18(3):21-29.Zhu Y Q,Xia C J,Li P.1997.A PTD method:A new method for determining focal depth and its application[J].Seismological and Geomagnetic Observation and Research,18(3):21-29(in Chinese).
朱元清,宋秀青,刘双庆.2017.中国地震测定参考速度结构研究[M].北京:地震出版社:345-434.Zhu Y Q,Song X Q,Liu S Q.2017.Research on Earthquake Reference Velocity Structure of China[M].Beijing:Seismological Press:345-434(in Chinese).
Berry M J,Fuchs K.1973.Crustal structure of the Superior and Grenville Provinces of the northeastern Canadian shield[J].Bull Seismol Soc Am,63(4):1393-1432(in Chinese).
Conrad V.1925.Laufzeitkurven des Tauernbebens vom 28.November 1923[M].Wien:Mitt.Erdb Komm,59:1-23(in Germany).
Kumar A,Roy P N S,Das L K.2016.Vertical density contrast and mapping of basement,Conrad and Moho morphologies through 2D spectral analysis of gravity data in and around Odisha,India[J].J Asian Earth Sci,124:181-190.
Litak R K,Brown L D.1989.A modern perspective on the Conrad discontinuity[J].EOS,70(29):713-725.
Pavlenkova N I.1993.The Kola superdeep drillhole and the nature of seismic boundaries[J].Terra Nova,4(1):117-123.
Richard A K.1989.Deep holes yielding geoscience surprises[J].Science,245(4917):468-470.
Wang Z.2014.Joint inversion of P-wave velocity and v P-v S ratio:Imaging the deep structure in NE Japan[J].Appl Geophys,11(2):119-127.
范玉兰,林纪曾,胡瑞贺,罗振暖.1990.华南地区近震走时表的研制[J].华南地震,10(2):1–16.Fan Y L,Lin J Z,Hu R H,Luo Z N.1990.The development of travel timetable for near earthquake in South China[J].South China Journal of Seismology,10(2):1–16(in Chinese).
郭杰,郑杰,吴静.2013.濮阳台地方震不明震相分析探讨[J].河南科技,(1):28–29.Guo J,Zheng J,Wu J.2013.Analysis and discussion of unknown phase in Puyang station in local earthquake[J].Journal of Henan Science and Technology,(1):28–29(in Chinese).
胡德昭,恽玲舲,姜永基,王良书,徐鸣洁.1989.中国东南部的壳内低速层与康拉德面[J].石油实验地质,11(4):331-340.Hu D Z,Yun L L,Jiang Y J,Wang L S,Xu M J.1989.On the low velocity layer and Conrad surface within the crust of southern parts of China[J].Petroleum Geology&Experiment,11(4):331-340(in Chinese).
黄海波,丘学林,夏少红.2012.海南岛地壳厚度与泊松比结构[J].热带海洋学报,31(3):65-70.Huang H B,Qiu X L,Xia S H.2012.Crustal structure and Poisson’s ratio beneath Hainan Island[J].Journal of Tropical Oceanography,31(3):65-70(in Chinese).
焦煜媛,沈旭章,李秋生.2017.青藏高原东北缘康拉德界面存在的地震学证据及构造意义初探[J].地球学报,38(4):469-478.Jiao Y Y,Shen X Z,Li Q S.2017.Seismic evidence of the Conrad discontinuity on the northeast margin of the Tibetan Plateau and a tentative discussion on its tectonic implications[J].Acta Geoscientica Sinica,38(4):469-478(in Chinese).
李志雄,雷建设,赵大鹏,武巴特尔,沈繁銮,丘学林.2008.海南岛及邻区地壳三维P波速度结构[J].地震学报,30(5):441-448.Li Z X,Lei J S,Zhao D P,Wu Bateer,Shen F L,Qiu X L.2008.3-D P-wave velocity structure of the crust beneath Hainan Island and adjacent regions[J].Acta Seismologica Sinica,30(5):441-448(in Chinese).
林建民,王宝善,葛洪魁,唐杰,张先康,陈颙.2008.大容量气枪震源特征及地震波传播的震相分析[J].地球物理学报,51(1):206-212.Lin J M,Wang B S,Ge H K,Tang J,Zhang X K,Chen Y.2008.Study on large volume airgun source characteristics and seismic phase analysis[J].Chinese Journal of Geophysics,51(1):206-212(in Chinese).
刘瑞丰,陈翔,沈道康,郑秀芬,杨辉,陈宏峰.2014.宽频带数字地震记录震相分析[M].北京:地震出版社:14-15.Liu R F,Chen X,Shen D K,Zheng X F,Yang H,Chen H F.2014.Seismic Phase Analysis of Broad-Band Digital Seismic Records[M].Beijing:Seismological Press:14-15(in Chinese).
刘赛君,曾钢平,丘学林,符干,吴世敏,叶三余,陈金海,Flueh E.2011.海南岛西南海域地壳剖面海陆联合探测研究[J].地球物理学进展,26(3):922-933.Liu S J,Zeng G P,Qiu X L,Fu G,Wu S M,Ye S Y,Chen J H,Flueh E.2011.The crustal profile and onshore-offshore seismic exploration in the marine area southwest to Hainan Island[J].Progress in Geophysics,26(3):922-933(in Chinese).
王莉婵,朱元清,李雪英,王铎,蔡玲玲,李冬圣,杨锐.2016.河北地区地壳一维速度模型的新近研究[J].华北地震科学,34(4):1-10.Wang L C,Zhu Y Q,Li X Y,Wang D,Cai L L,Li D S,Yang R.2016.Study on one-dimensional crustal velocity model in Hebei area[J].North China Earthquake Sciences,34(4):1-10(in Chinese).
杨配新,邓存华,刘希强,任勇,颜其中.2004.数字化地震记录震相自动识别的方法研究[J].地震研究,27(4):308-313.Yang P X,Deng C H,Liu X Q,Ren Y,Yan Q Z.2004.Studies on auto-distinguishing phase of digital seismic recordings[J].Journal of Seismological Research,27(4):308-313(in Chinese).
殷伟伟,李颖,赵永,李自红.2017.山西地区Pb震相识别及特征研究[J].地球物理学进展,32(1):95-100.Yin W W,Li Y,Zhao Y,Li Z H.2017.Study on identification and characteristics of the Pb phase in Shanxi area[J].Progress in Geophysics,32(1):95-100(in Chinese).
赵荣国.1999.震相分析是地震科学的心脏[J].地震地磁观测与研究,20(5):121-126.Zhao R G.1999.Phase analysis is the heart of seismology[J].Seismological and Geomagnetic Observation and Research,20(5):121-126(in Chinese).
朱元清,石耀霖,李平.1990.一种确定地震深度的新方法[J].地震地磁观测与研究,11(2):4-12.Zhu Y Q,Shi Y L,Li P.1990.A new method for determining the depth of earthquake[J].Seismological and Geomagnetic Observation and Research,11(2):4-12(in Chinese).
朱元清,夏从俊,李平.1997.确定震源深度的PTD方法及其应用[J].地震地磁观测与研究,18(3):21-29.Zhu Y Q,Xia C J,Li P.1997.A PTD method:A new method for determining focal depth and its application[J].Seismological and Geomagnetic Observation and Research,18(3):21-29(in Chinese).
朱元清,宋秀青,刘双庆.2017.中国地震测定参考速度结构研究[M].北京:地震出版社:345-434.Zhu Y Q,Song X Q,Liu S Q.2017.Research on Earthquake Reference Velocity Structure of China[M].Beijing:Seismological Press:345-434(in Chinese).
Berry M J,Fuchs K.1973.Crustal structure of the Superior and Grenville Provinces of the northeastern Canadian shield[J].Bull Seismol Soc Am,63(4):1393-1432(in Chinese).
Conrad V.1925.Laufzeitkurven des Tauernbebens vom 28.November 1923[M].Wien:Mitt.Erdb Komm,59:1-23(in Germany).
Kumar A,Roy P N S,Das L K.2016.Vertical density contrast and mapping of basement,Conrad and Moho morphologies through 2D spectral analysis of gravity data in and around Odisha,India[J].J Asian Earth Sci,124:181-190.
Litak R K,Brown L D.1989.A modern perspective on the Conrad discontinuity[J].EOS,70(29):713-725.
Pavlenkova N I.1993.The Kola superdeep drillhole and the nature of seismic boundaries[J].Terra Nova,4(1):117-123.
Richard A K.1989.Deep holes yielding geoscience surprises[J].Science,245(4917):468-470.
Wang Z.2014.Joint inversion of P-wave velocity and v P-v S ratio:Imaging the deep structure in NE Japan[J].Appl Geophys,11(2):119-127.