台湾两次7级地震前后福建沿海地区地壳运动的变化
|
摘要
福建沿海地区GPS网从1995年建设至今已积累了6期观测资料,分析该网各GPS站位移变化与运动速度变化的时间序列,发现在1999年9月20日(UTC)台湾集集Ms7.7大地震与2001年12月18日(UTC)花莲东Ms7.6大地震前,各GPS站同步出现了向西与向北位移的大幅度偏移,即向东与向南运动的速度明显减小。在集集Ms7.7大地震发生后,各GPS站出现了同步的向东与向南位移的大幅度偏移,即向东与向南运动的速度大幅度增加。福建沿海地区在1997～2001年期间出现的地壳运动的变化不仅在时间上与集集、花莲东两次7级大地震的孕育发生相关,而且二者在形成机理上一致,都是由孕育这两次地震的应力场决定的。
The GPS network of Fujian has been surveyed 6 times from 1995 to now.After analysing the time sequences of the changes of displacement and movement velocity,we have discovered large westward and northward sync-displacement of GPS sites, i.e. eastward and southward movement velocity decrease obviously before Chi-Chi Ms7.7earthquake in Sept.20,1999 (UTC) and Ms7.6 in eastern of Hualian in Dec.18,2001 (UTC) and large eastward and southward sync-displacement of GPS sites, i.e. movement velocity increase much after Chi-Chi Ms7.7 earthquake. The crustal movement change in 1997~2001 in coastal areas of Fujian was closely related to preparation and occurrence of Chi-Chi and eastern of Hualian earthquakes not only in time, but also their preparation mechanism are consist with each other since they were caused by strain field growing along with the two earthquakes.
The GPS network of Fujian has been surveyed 6 times from 1995 to now.After analysing the time sequences of the changes of displacement and movement velocity,we have discovered large westward and northward sync-displacement of GPS sites, i.e. eastward and southward movement velocity decrease obviously before Chi-Chi Ms7.7earthquake in Sept.20,1999 (UTC) and Ms7.6 in eastern of Hualian in Dec.18,2001 (UTC) and large eastward and southward sync-displacement of GPS sites, i.e. movement velocity increase much after Chi-Chi Ms7.7 earthquake. The crustal movement change in 1997~2001 in coastal areas of Fujian was closely related to preparation and occurrence of Chi-Chi and eastern of Hualian earthquakes not only in time, but also their preparation mechanism are consist with each other since they were caused by strain field growing along with the two earthquakes.
引文
1张徽正.九二一地震地质调查报告[R].台北:经济部中央地质调查所,2000,1～10.Zhang Huizheng.Geological Investigation Report of9.21Earthquake[R].Taibei:Central Geological Institute of Eco-nomic Ministry,2000,1-10.(in Chinese)
2Chang C H,Wu Y M,Shin T C and Wang C Y.Relocated Chi-Chi,Taiwan earthquake and its characteristics[R].2000Western Pacific Geophysics Meeting,Tokyo,Japan,2000a,27June-1July2000.
3Yu S B,et al.Preseismic deformation and coseismic dis-placements associated with the1999Chi-Chi,Taiwan,earthquake[J].Bull Seismol.Soc.Am.,2001,91:995-1012.
4吴云.台湾集集921地震地壳形变的简介与讨论[J].地壳形变与地震,2001,21(2):59～63.Wu Yun.The crustal deformation of Chi-Chi921earthquake in Taiwan[J].Crustal Deformation and Earthquake,2001,21(2):59-63.(in Chinese)
5Yu S B,et al.GPS measurement of postseismic deformation following the1999Chi-Chi,Tai Wan,earthquake[J].J.Geophys.Res.,2003,108,B11,2520,doi:10.1029/2003JB002396.
6史粦华,等.福建省地壳形变观测台网建设简介[J].大地测量与地球动力学,2003,23(1):125～126.Shi Linhua,et al.Brief of construction of crustal deformation observatory network in Fujian province[J].Journal of Geod-esy and Geodynamics,2003,23(1):125-126.(in Chi-nese)
7史粦华.福建及邻区现今地壳运动与形变[J].大地测量与地球动力学,2005,25(3):69～74.Shi Linhua.Present-day crustal movement and deformation in Fujian provence and adjacent area[J].Journal of Geode-sy and Geodynamics,2005,25(3):69-74.(in Chinese)
8周硕愚,等.中国大陆东南边缘现时地壳运动与地震动力学综合研究[J].地壳形变与地震,2001,21(1):1～14.Zhou Shuoyu,et al.Integrated research on current crustal movement and earthquake dynamics in marginal seamsouth-easat of China continent[J].Crustal Deformation and Earth-quake,2001,21(1):1-14.(in Chinese)
9郭逢英,等.GPS测量揭示的福建沿海地区的现今地形变[J].大地测量与地球动力学,2003,23(3):87～92.Guo Fengying,et al.Crustal deformation along coast of Fujian revealed by GPS[J].Journal of Geodesy and Geodynamics,2003,23(3):87-92.(in Chinese)
10李延兴,等.台湾集集7.6级地震前后福建沿海地区的地壳运动[J].大地测量与地球动力学,2006,26(2):5～9.Li Yanxing,et al.Crustal movement in coastal area of Fu-jian before and afterM7.6earthquake[J].Journal of Ge-odesy and Geodynamics,2006,26(2):5-9.(in Chi-nese)
11李延兴,等.台海地区地壳运动变形[J].地震学报,2002,24(5):487～495.Li Yanxing,et al.Crustal movement and deformation in Taiwan and its coastal area[J].Acta Seismologica Sinica,2002,24(5):487-495.(in Chinese)
12王敏,等.现今中国大陆地壳运动与活动块体模型[J].中国科学(D辑),2003,46(Supp.)25～40.Wang Min,et al.Contemporary crustal deformation of the Chinese continent and tectonic block model[J].Science in China(Series D),2003,46(Supp.)25-40.(in Chinese)
13Chang C H,Wu Y M,Shin TC and Wang C Y.Relocation of the1999Chi-Chi earthquake in Taiwan[R].TAO,2000b,11:581-590.
14Kao H,Chen R Y and Chang C H.Exactly where does the1999Chi-Chi earthquake in Taiwan nucleate?Hypocenter relocation using the master station method[R].TAO,2000,11:567-580.
15Shin TC,Kuo KW,Lee W HK,Teng TLand Tsai Y B.A preliminary report on the1999Chi-Chi(Taiwan)earthquake[J].2000,Seism.Res.Lett.71:24-30.
16Xu L S,Chen Y T,Teng TL and Patau G.Temporal-spa-tial rupture process of the1999Chi-Chi earthquake from I-RIS and GEOSCOPE long-period waveform data using after-shocks as empirical green’s functions[J].Bulletin of the Seismological Society of America.,2002,92(8):3210-3228.
17Bruce J,Shyu H,Sieh K,Chen Y U.Neotectonic arChi-tecture Taiwan and its implications for future large earth-quakes[J].J.Geophysi.Res.,2005,110,B08402,10.1029/2004JB003251.
18Mesherikov J A.Recent crustal movements in seismic re-gion:geodetic and georphic data[J].Tectonophysics,1968,6:29-39.
19ДОБРОВОЛЬСКИЙИПТеорияΠобэомобкиЗемлесмря[M].Москва:ИФЭАНСССР,1991.
20宋治平,尹祥础,梅世蓉.地震孕育体源流变模型(二)——应变场及其应用[J].地震学报,2004,26(2)131～138.Song Zhiping,Yin Xingchu and Mei Shirong.3-D rheologic model of earthquake preparation(2)——strain field and its applications[J].Acta Seismologica Sinica,2004,26(2)131-138.(in Chinese)
2Chang C H,Wu Y M,Shin T C and Wang C Y.Relocated Chi-Chi,Taiwan earthquake and its characteristics[R].2000Western Pacific Geophysics Meeting,Tokyo,Japan,2000a,27June-1July2000.
3Yu S B,et al.Preseismic deformation and coseismic dis-placements associated with the1999Chi-Chi,Taiwan,earthquake[J].Bull Seismol.Soc.Am.,2001,91:995-1012.
4吴云.台湾集集921地震地壳形变的简介与讨论[J].地壳形变与地震,2001,21(2):59～63.Wu Yun.The crustal deformation of Chi-Chi921earthquake in Taiwan[J].Crustal Deformation and Earthquake,2001,21(2):59-63.(in Chinese)
5Yu S B,et al.GPS measurement of postseismic deformation following the1999Chi-Chi,Tai Wan,earthquake[J].J.Geophys.Res.,2003,108,B11,2520,doi:10.1029/2003JB002396.
6史粦华,等.福建省地壳形变观测台网建设简介[J].大地测量与地球动力学,2003,23(1):125～126.Shi Linhua,et al.Brief of construction of crustal deformation observatory network in Fujian province[J].Journal of Geod-esy and Geodynamics,2003,23(1):125-126.(in Chi-nese)
7史粦华.福建及邻区现今地壳运动与形变[J].大地测量与地球动力学,2005,25(3):69～74.Shi Linhua.Present-day crustal movement and deformation in Fujian provence and adjacent area[J].Journal of Geode-sy and Geodynamics,2005,25(3):69-74.(in Chinese)
8周硕愚,等.中国大陆东南边缘现时地壳运动与地震动力学综合研究[J].地壳形变与地震,2001,21(1):1～14.Zhou Shuoyu,et al.Integrated research on current crustal movement and earthquake dynamics in marginal seamsouth-easat of China continent[J].Crustal Deformation and Earth-quake,2001,21(1):1-14.(in Chinese)
9郭逢英,等.GPS测量揭示的福建沿海地区的现今地形变[J].大地测量与地球动力学,2003,23(3):87～92.Guo Fengying,et al.Crustal deformation along coast of Fujian revealed by GPS[J].Journal of Geodesy and Geodynamics,2003,23(3):87-92.(in Chinese)
10李延兴,等.台湾集集7.6级地震前后福建沿海地区的地壳运动[J].大地测量与地球动力学,2006,26(2):5～9.Li Yanxing,et al.Crustal movement in coastal area of Fu-jian before and afterM7.6earthquake[J].Journal of Ge-odesy and Geodynamics,2006,26(2):5-9.(in Chi-nese)
11李延兴,等.台海地区地壳运动变形[J].地震学报,2002,24(5):487～495.Li Yanxing,et al.Crustal movement and deformation in Taiwan and its coastal area[J].Acta Seismologica Sinica,2002,24(5):487-495.(in Chinese)
12王敏,等.现今中国大陆地壳运动与活动块体模型[J].中国科学(D辑),2003,46(Supp.)25～40.Wang Min,et al.Contemporary crustal deformation of the Chinese continent and tectonic block model[J].Science in China(Series D),2003,46(Supp.)25-40.(in Chinese)
13Chang C H,Wu Y M,Shin TC and Wang C Y.Relocation of the1999Chi-Chi earthquake in Taiwan[R].TAO,2000b,11:581-590.
14Kao H,Chen R Y and Chang C H.Exactly where does the1999Chi-Chi earthquake in Taiwan nucleate?Hypocenter relocation using the master station method[R].TAO,2000,11:567-580.
15Shin TC,Kuo KW,Lee W HK,Teng TLand Tsai Y B.A preliminary report on the1999Chi-Chi(Taiwan)earthquake[J].2000,Seism.Res.Lett.71:24-30.
16Xu L S,Chen Y T,Teng TL and Patau G.Temporal-spa-tial rupture process of the1999Chi-Chi earthquake from I-RIS and GEOSCOPE long-period waveform data using after-shocks as empirical green’s functions[J].Bulletin of the Seismological Society of America.,2002,92(8):3210-3228.
17Bruce J,Shyu H,Sieh K,Chen Y U.Neotectonic arChi-tecture Taiwan and its implications for future large earth-quakes[J].J.Geophysi.Res.,2005,110,B08402,10.1029/2004JB003251.
18Mesherikov J A.Recent crustal movements in seismic re-gion:geodetic and georphic data[J].Tectonophysics,1968,6:29-39.
19ДОБРОВОЛЬСКИЙИПТеорияΠобэомобкиЗемлесмря[M].Москва:ИФЭАНСССР,1991.
20宋治平,尹祥础,梅世蓉.地震孕育体源流变模型(二)——应变场及其应用[J].地震学报,2004,26(2)131～138.Song Zhiping,Yin Xingchu and Mei Shirong.3-D rheologic model of earthquake preparation(2)——strain field and its applications[J].Acta Seismologica Sinica,2004,26(2)131-138.(in Chinese)
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心