华北地区地壳上地幔三维P波速度结构
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摘要
利用华北地震科学台阵和首都圈地震台网记录的4511次近震和625次远震的P波到时数据,采用纬度和经度方向分别为0.5°×0.5°的网格划分,反演得到了华北北部地区(111°E—120°E,37°N—42°N)深至400km的地壳上地幔三维P波速度结构.层析成像结果表明,研究区的速度存在明显的横向不均匀性,随着深度增加横向不均匀性总体呈现减弱趋势.燕山隆起带在60—120km深度内存在明显的高速异常,这与较大的岩石圈厚度有关;山西裂陷盆地、华北平原下方60km深度存在明显低速异常,与软流圈的出现有关.燕山隆起带岩石圈厚度在120km以上,明显比太行山隆起的岩石圈厚度大,与稳定大陆地区的岩石圈厚度一致.太行山山前断裂已切穿莫霍面,贯入岩石圈.研究区上地幔顶部大范围的低速异常反映了软流圈上隆的特点.在华北平原及燕山隆起下方200—300km存在高速异常可能与太古代大陆板块岩石圈的残留体有关.
3-D P wave velocity structure of the crust and upper mantle beneath North China (37°N—42°N,111°E—120°E) down to a depth of 400 km has been studied by tomographically inverting P arrival times from 4512 local events and 625 telesiesmic events recorded by the North China Seismic Array and the Capital Circle Seismic Network. With a resolution of grid spacing of 0.5°×0.5°,the latreral velocity heterogeneity is obviously seen though it attenuates with increasing depth. Prominent high velocity anomalies are imaged beneath Yanshan uplift in the depth range of 60—120 km,possibly inplying a thick lithosphere there. Remarkable low velocity anomalies beneath Shanxi orogenic belt and North China basin around the depth of 60 km may indicate the appearance of asthenosphere. The thickness of lithosphere may be beyond 120 km depth beneath Yanshan uplift,which is thicker than Taihangshan uplift. Taihangshan-frontal fault may reach the lower lithosphere. Low velocity anomalies in uppermost mantle may be related to the upwelling of hot materials from asthenosphere. High velocity anomalies beneath North China basin and Yanshan uplift in the depth range of 200—300 km may be an indication of the detached Archaean continental lithosphere.
3-D P wave velocity structure of the crust and upper mantle beneath North China (37°N—42°N,111°E—120°E) down to a depth of 400 km has been studied by tomographically inverting P arrival times from 4512 local events and 625 telesiesmic events recorded by the North China Seismic Array and the Capital Circle Seismic Network. With a resolution of grid spacing of 0.5°×0.5°,the latreral velocity heterogeneity is obviously seen though it attenuates with increasing depth. Prominent high velocity anomalies are imaged beneath Yanshan uplift in the depth range of 60—120 km,possibly inplying a thick lithosphere there. Remarkable low velocity anomalies beneath Shanxi orogenic belt and North China basin around the depth of 60 km may indicate the appearance of asthenosphere. The thickness of lithosphere may be beyond 120 km depth beneath Yanshan uplift,which is thicker than Taihangshan uplift. Taihangshan-frontal fault may reach the lower lithosphere. Low velocity anomalies in uppermost mantle may be related to the upwelling of hot materials from asthenosphere. High velocity anomalies beneath North China basin and Yanshan uplift in the depth range of 200—300 km may be an indication of the detached Archaean continental lithosphere.
引文
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黄金莉,赵大鹏.2005.首都圈地区地壳三维P波速度细结构与强震孕育的深部构造环境[J].科学通报,50(4):348-355.
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嘉世旭,张先康.2005.华北不同构造块体地壳结构及其对比研究[J].地球物理学报,48(3):611-620.
李志伟,胥颐,郝天珧,刘劲松,张玲.2006.环渤海地区的地震层析成像与地壳上地幔结构[J].地球物理学报,49(3):797-804.
刘福田,曲克信,吴华,李强,刘建华,胡戈.1986.中国大陆及其邻近地区的地震层析成像[J].地球物理学报,32(3):281-291.
刘建华,胥颐,郝天珧,刘劲松.2005.中国边缘海及邻区地壳和上地幔速度结构特征[J].地球物理进展,20(3):594-599.
齐诚,赵大鹏,陈颐,陈棋福,王宝善.2006.首都圈地区地壳P波和S波三维速度结构及其与大地震的关系[J].地球物理学报,49(3):805-815.
宋仲和,陈国英,安昌强,陈立华.1992.中国东部及其相邻海域S波三维速度结构[J].地球物理学报,35(3):316-329.
滕吉文,曾融生,闫雅芬,张慧.2002.东亚大陆及周边海域Moho界面深度分布和基本构造格局[J].中国科学:D辑,32(2):89-100.
田晓峰,张先康,嘉世旭,杨卓欣,段永红,徐朝繁,张成科,张健狮.2006.华北北部不同构造单元地壳速度模型:均匀分层介质反射波走势反演的结果[J].华北地震科学,24(3):1-5.
汪素云,许忠淮,裴顺平.2003.华北地壳上地幔顶部Pn波速度结构及其构造含义[J].中国科学:D辑,33(增刊):91-98.
胥颐,刘建华,郝天珧,刘劲松,李志伟.2006.中国东部海域及邻区岩石层地幔的P波速度结构与构造分析[J].地球物理学报,49(4):1053-1061.
张岭,刘劲松,郝天珧,刘建华,胥颐.2007.渤海湾盆地及其领域地区地壳与上地幔层析成像[J].中国科学:D辑,37(11):1444-1455.
朱介寿,曹家敏,李显贵,周兵.1997.中国及其邻区地球三维结构初始模型的建立[J].地球物理学报,40(5):627-648.
朱露培,曾融生,刘福田.1990.京津唐张地区地壳上地幔三维P波速度结构[J].地球物理学报,33(3):267-27.
朱日祥.2007.地球内部结构探测研究:以华北克拉通为例[J].地球物理学进展,22(4):1090-1100.
Lei Jianshe,Xie Furen,Lan Congxin,Xing Chengqi,Ma Shizhen.2008.Seismic i mages under the Beijing region in-ferred from P and PmP data[J].Phys Earth Planet Interi,168(3-4):134-146.
Tian You,Zhao Dapeng,Sun Ruomei,Teng Ji wen.2009.Seismic i maging of the crust and upper mantle beneath theNorth China Craton[J].Phys Earth Planet Interi,172(3-4):169-182.
Zhao Dapeng,Akira Hasegawa,Shigeki Horiuchi.1992.Tomographic i maging of P and S wave velocity structure be-neath northeastern Japan[J].J Geophys Res,97(B13):19909-19928.
Zhao Dapeng,Akira Hasegawa.1994.Deep structure of Japan subduction zone as derived fromlocal,regional,andteleseismic events[J].J Geophys Res,99(B11):22313-22329.
邓晋福,莫宣学,赵海玲,罗照华,杜杨松.1994.中国东部岩石圈根/去根作用与大陆“活化”[J].现在地质,8(3):349-356.
丁志峰.1999.近震层析成像的理论及应用[D].北京:中国地震局地球物理研究所:154.
马杏垣.1989.中国岩石圈动力学地图集[M].北京:中国地图出版社:59-61.
何正勤,丁志峰,叶太兰,孙为国,张乃铃.2002.中国大陆及其领域的瑞利波群速度分布图象与地壳上地幔速度结构[J].地震学报,24(3):252-259.
洪学海,朱介寿,曹家敏,许卓群.2003.中国大陆地壳上地幔S波品质因子三维层析成像[J].地球物理学报,46(5):642-651.
黄金莉,赵大鹏.2005.首都圈地区地壳三维P波速度细结构与强震孕育的深部构造环境[J].科学通报,50(4):348-355.
嘉世旭,齐诚,王夫运,陈棋福,张先康,陈颙.2005.首都圈地壳网格化三维结构[J].地球物理学报,48(6):1316-1324.
嘉世旭,张先康.2005.华北不同构造块体地壳结构及其对比研究[J].地球物理学报,48(3):611-620.
李志伟,胥颐,郝天珧,刘劲松,张玲.2006.环渤海地区的地震层析成像与地壳上地幔结构[J].地球物理学报,49(3):797-804.
刘福田,曲克信,吴华,李强,刘建华,胡戈.1986.中国大陆及其邻近地区的地震层析成像[J].地球物理学报,32(3):281-291.
刘建华,胥颐,郝天珧,刘劲松.2005.中国边缘海及邻区地壳和上地幔速度结构特征[J].地球物理进展,20(3):594-599.
齐诚,赵大鹏,陈颐,陈棋福,王宝善.2006.首都圈地区地壳P波和S波三维速度结构及其与大地震的关系[J].地球物理学报,49(3):805-815.
宋仲和,陈国英,安昌强,陈立华.1992.中国东部及其相邻海域S波三维速度结构[J].地球物理学报,35(3):316-329.
滕吉文,曾融生,闫雅芬,张慧.2002.东亚大陆及周边海域Moho界面深度分布和基本构造格局[J].中国科学:D辑,32(2):89-100.
田晓峰,张先康,嘉世旭,杨卓欣,段永红,徐朝繁,张成科,张健狮.2006.华北北部不同构造单元地壳速度模型:均匀分层介质反射波走势反演的结果[J].华北地震科学,24(3):1-5.
汪素云,许忠淮,裴顺平.2003.华北地壳上地幔顶部Pn波速度结构及其构造含义[J].中国科学:D辑,33(增刊):91-98.
胥颐,刘建华,郝天珧,刘劲松,李志伟.2006.中国东部海域及邻区岩石层地幔的P波速度结构与构造分析[J].地球物理学报,49(4):1053-1061.
张岭,刘劲松,郝天珧,刘建华,胥颐.2007.渤海湾盆地及其领域地区地壳与上地幔层析成像[J].中国科学:D辑,37(11):1444-1455.
朱介寿,曹家敏,李显贵,周兵.1997.中国及其邻区地球三维结构初始模型的建立[J].地球物理学报,40(5):627-648.
朱露培,曾融生,刘福田.1990.京津唐张地区地壳上地幔三维P波速度结构[J].地球物理学报,33(3):267-27.
朱日祥.2007.地球内部结构探测研究:以华北克拉通为例[J].地球物理学进展,22(4):1090-1100.
Lei Jianshe,Xie Furen,Lan Congxin,Xing Chengqi,Ma Shizhen.2008.Seismic i mages under the Beijing region in-ferred from P and PmP data[J].Phys Earth Planet Interi,168(3-4):134-146.
Tian You,Zhao Dapeng,Sun Ruomei,Teng Ji wen.2009.Seismic i maging of the crust and upper mantle beneath theNorth China Craton[J].Phys Earth Planet Interi,172(3-4):169-182.
Zhao Dapeng,Akira Hasegawa,Shigeki Horiuchi.1992.Tomographic i maging of P and S wave velocity structure be-neath northeastern Japan[J].J Geophys Res,97(B13):19909-19928.
Zhao Dapeng,Akira Hasegawa.1994.Deep structure of Japan subduction zone as derived fromlocal,regional,andteleseismic events[J].J Geophys Res,99(B11):22313-22329.
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