地震研究

采用GPS连续观测数据,利用去周期后的K-L最佳直线拟合方法及站心坐标系下的基线结果,对大陆范围内地块运动状态、山东所处地块与周边地块及沂沭断裂带两侧的相对运动状态进行了分析。结果表明:(1)日本9.0级地震使大陆东部地块向东的速率加大(6～9 mm/a),偏向板块俯冲区域;(2)山东地区所处地块与其西侧鄂尔多斯地块对日本9.0级地震响应的差异引起两地块间的拉张;(3)日本9.0级地震前沂沭断裂带表现为挤压右走滑状态,而地震后表现出分段特征:北段为挤压右走滑特征,南段为拉张左走滑特征。

On the basis of continuous GPS observation data,the motion state of the blocks in China mainland,relative motion state between the blocks in Shandong and its adjacent area and the extrusion and strike-slip characteristics of Yishu Fault zone were analyzed by using the K-L best linear fitting method after periodic components rejection and the baseline results under the topocentric coordinate system. The results showed that:(1)The Japan M9.0 earthquake made the eastward rate of block increase(6～9 mm/a)in eastern China and the direction of the block toward to the plate subduction area;(2)The different responses to the Japan M9.0 earthquake between the blocks in Shandong and its western side Ordos block caused the tension of the two blocks;(3)Before the Japan M9.0 earthquake,the Yishu Fault zone appeared the status of extrusion right sliding,but it showed segmentation characteristics after the earthquake,such as the north section showed extrusion right sliding and the south one showed tension left sliding.

引言
1 GPS数据处理方法
2 中国大陆区域内地块运动状态分析
3 山东与周边地区相对运动状态分析
4 山东内部地壳运动状态分析
5 结论和讨论

图1 日本9.0级地震前后各GPS站点相对于NNR-NUVEL的速率分布<br/>Fig.1 Rate distribution relative to NNR-NUVEL geologic model of the GPS sites before and after Japan M9.0 earthquake

图1 日本9.0级地震前后各GPS站点相对于NNR-NUVEL的速率分布
Fig.1 Rate distribution relative to NNR-NUVEL geologic model of the GPS sites before and after Japan M9.0 earthquake

表1 日本9.0级地震前后各地块平均速度的变化(相对NNR-NUVEL地质模型)<br/>Tab.1 The average rate change of the blocks before and after Japan M9.0 earthquake(relative to NNR-NUVEL geologic model)

表1 日本9.0级地震前后各地块平均速度的变化(相对NNR-NUVEL地质模型)
Tab.1 The average rate change of the blocks before and after Japan M9.0 earthquake(relative to NNR-NUVEL geologic model)

图2 2011年日本9.0级地震前后华北区域内GPS站点相对于TAIN站的速率分布<br/>Fig.2 Rate distribution of the GPS sites in North China relative to TAIN site before and after Japan M9.0 earthquake in 2011

图2 2011年日本9.0级地震前后华北区域内GPS站点相对于TAIN站的速率分布
Fig.2 Rate distribution of the GPS sites in North China relative to TAIN site before and after Japan M9.0 earthquake in 2011

图3 2007～2011年(a)和2011～2012年(b)<br/>沂沭断裂带拉张、走滑分量<br/>(沂沭断裂带东侧相对于西侧)<br/>Fig.3 Tension,strike-slip components of Yishu Fault zone from 2007 to 2011(a)and from 2011 to 2012(b)(the east of Yishu Fault zone relative to the west)

图3 2007～2011年(a)和2011～2012年(b)
沂沭断裂带拉张、走滑分量
(沂沭断裂带东侧相对于西侧)
Fig.3 Tension,strike-slip components of Yishu Fault zone from 2007 to 2011(a)and from 2011 to 2012(b)(the east of Yishu Fault zone relative to the west)

表2 沂沭断裂带平均拉张、走滑分量(拉张分量以拉张为正,走滑分量以左滑为正)<br/>Tab.2 The average tension,strike-slip components of Yishu Fault zone(tension is positive in tension component and left sliding is positive in strike-slip component)

表2 沂沭断裂带平均拉张、走滑分量(拉张分量以拉张为正,走滑分量以左滑为正)
Tab.2 The average tension,strike-slip components of Yishu Fault zone(tension is positive in tension component and left sliding is positive in strike-slip component)

图4 2011～2012年山东地区相邻GPS站点基线长度变化速率分布<br/>Fig.4 The distribution of baseline length change rate of the adjacent GPS sites in Shandong during 2011 and 2012

图4 2011～2012年山东地区相邻GPS站点基线长度变化速率分布
Fig.4 The distribution of baseline length change rate of the adjacent GPS sites in Shandong during 2011 and 2012

洪川,窦振亚,刘锋涛.2008.郯庐地震带与日本海沟、琉球群岛地震带之间的地震活动群体特征联系[J].海洋地质动态,24(10):l-7.
李征航,黄劲松.2005.GPS测量与数据处理[M].武汉:武汉大学出版社,161-162.
刘晓霞,江在森,武艳强.2012.利用GPS资料研究郯庐带现今运动及变形状态[J].地震,32(4):1-10.
茂木清夫.1976.巨大地震论[J].数理科学,158:16-23.
荣敏,周巍.2009.基于ITRF2005的全球板块运动模型[J].海洋测绘,29(1):1-3.
王敏,沈正康,牛之俊,等.2003.现今中国大陆地壳运动与活动块体模型[J].中国科学(D辑),33(增刊):65-81.
肖根如,甘卫军,陈为涛,等.2010.青藏高原班公—怒江缝合带现今运动状况的GPS观测研究[J].吉林大学学报(地球科学版),40(6):1496-1502.
杨少敏,聂兆生,贾志革,等.2011.GPS解算的日本MW9.0地震的远场同震地表位移[J].武汉大学学报·信息科学版,36(11):1336-1339.
殷海涛,甘卫军,黄蓓,等.2013.日本M9.0级巨震对山东地区地壳活动的影响研究[J].地球物理学报,56(5):1497-1505.
殷海涛,王强,朱成林,等.2011.山东及周边地块间近期运动状态分析[J].大地测量与地球动力学,31(4):37-41.
张培震,邓起东,张国民,等.2003.中国大陆的强震活动与活动地块[J].中国科学D辑,33(增刊):12-20.
周德敏,甘卫军,任金卫等.2005.基于GPS观测资料反演庄浪河断裂带、马衔山北缘断裂带的滑动速率[J].地震地质,27(4):706-715.

备注

引言

1 GPS数据处理方法

2 中国大陆区域内地块运动状态分析

3 山东与周边地区相对运动状态分析

4 山东内部地壳运动状态分析

5 结论和讨论

期刊信息