郯庐断裂带山东段深孔地应力测量及其现今活动性分析
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摘要
已有的地表调查和GPS位移测量、深部震源机制等研究结果表明,郯庐断裂山东段现今活动性表现为顺时针压扭性活动特征。为揭示郯庐(郯城-庐江)断裂带山东段地表和深部之间地壳浅表层日本大地震发生后的现今地应力状态和活动特征,在鲁东北部花岗岩地区开展了600 m的钻探工程与地应力测量工作。钻探岩芯编录初步揭示地壳浅表层岩体结构特征,随深度系统的地应力测量结果表明,现今水平主应力起主导作用,易于断层走滑作用发生,且现今最大水平主应力方向为近东西向,反映出郯庐断裂带山东段现今活动特征为压性兼右旋走滑,与地表和深部已有研究成果相吻合。研究成果为郯庐断裂带山东段现今活动性研究补充了新的资料。
Analysis of earth surface displacement using GPS and deep focal mechanism show that present activity in the Shandong segment of Tan-Lu(Tancheng-Lujiang) fracture zone exhibit a clockwise compression-torsion characteristics in between the shallow earth crust and deep zone of the region after the 2008 Japan earthquake.Data was gathered from 25 in-situ stress sensors installed at varying intervals along the total depth of single 600 m borehole located inside a granite rich region at the northeast part of Shandong.Combined with in-situ stress data,core sampling of the structural features of shallow earth crust rock formations reveals that current horizontal principal stresses play a leading role in strike-slip fault activity.Moreover,measured maximum principle in-situ stress mechanics trend towards the east-west direction and reflects present compressive properties,with dextral slip activity,of the Shandong segment.Including pre-existing data of surface and subterranean experiments,this new data will allow us to open new research avenues for understanding the present active features of the Shandong segment of the Tan-Lu fracture belt.
Analysis of earth surface displacement using GPS and deep focal mechanism show that present activity in the Shandong segment of Tan-Lu(Tancheng-Lujiang) fracture zone exhibit a clockwise compression-torsion characteristics in between the shallow earth crust and deep zone of the region after the 2008 Japan earthquake.Data was gathered from 25 in-situ stress sensors installed at varying intervals along the total depth of single 600 m borehole located inside a granite rich region at the northeast part of Shandong.Combined with in-situ stress data,core sampling of the structural features of shallow earth crust rock formations reveals that current horizontal principal stresses play a leading role in strike-slip fault activity.Moreover,measured maximum principle in-situ stress mechanics trend towards the east-west direction and reflects present compressive properties,with dextral slip activity,of the Shandong segment.Including pre-existing data of surface and subterranean experiments,this new data will allow us to open new research avenues for understanding the present active features of the Shandong segment of the Tan-Lu fracture belt.
引文
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[2]吴满路,张岳桥,廖椿庭,等.汶川地震后沿龙门山断裂带原地应力测量初步结果[J].地质学报,2010,84(9):1292-1299.WU Ma-lu,ZHANG Yue-qiao,LIAO Chun-ting,et al.Preliminary results of in-situ stress along the Longmenshan fault zone after the Wenchuan Ms8.0 earthquake[J].ACTA Geologica Sinica,2010,84(9):1292-1299.
[3]陈群策,安其美,孙东生,等.山西盆地现今地应力状态与地震危险性分析[J].地球学报,2010,31(4):541-548.CHEN Qun-ce,AN Qi-mei,SUN Dong-sheng,et al.Current in-situ stress state of Shanxi basin and analysis of earthquake risk[J].ACTA Geoscientica Sinica,2010,31(4):541-548.
[4]谭成轩,孙叶,王连捷,等.地应力测量值得注意的若干问题[J].地质力学学报,2003,9(3):275-280.TAN Cheng-xuan,SUN Ye,WANG Lian-jie,et al.Some problems of in-situ crustal stress measurements[J].Journal of Geomachnics,2003,9(3):275-280.
[5]万天丰,朱鸿,赵磊,等.郯庐断裂带的形成与演化:综述[J].现代地质,1996,6:159-166.WAN Tian-feng,ZHU Hong,ZHAO Lei,et al.Formation and evolution of Tancheng-Lujiang fault zone:a review[J].Geoscience,1996,6:159-166.
[6]朱光,刘国生,牛漫兰,等.郯庐断裂带的平移运动与成因[J].地质通报,2003,22(3):200-207.ZHU Guang,LIU Guo-sheng,NIU Man-lan,et al.Transcurrent movement and genesis of the Tan-Lu fault zone[J].Geological Bulletin of China,2003,22(3):200-207.
[7]百度百科,郯庐断裂带[DB/OL].http://baike.baidu.com/view/1711157.htm,2012-07-31/2012-05-10.
[8]中国地震局.日本东海Mw9.0级地震在中国大陆东部区域的GPS同震位移[DB/OL].http://www.cea.gov.cn/manage/html/8a8587881632fa5c116674a018300cf/_content/11_03/22/1300780240530.html,2011-03-22/2012-05-10.
[9]王小凤,李中坚,陈柏林,等.郯庐断裂带[M].北京:地质出版社,2000:1-14.
[10]李方全,孙世宗,李立球,等.华北及郯庐断裂带地应力测量[J].岩石力学与工程学报,1982,(1):73-86.LI Fang-quan,SUN Shi-zong,LI Li-qiu,et al.In-situ stress measurements in north China and Tancheng-Lujiang fault zone[J].Chinese Journal of Rock Mechanics and Engineering,1982,(1):73-86.
[11]彭文绪,史浩,孙和风,等.郯庐走滑断层右旋走滑的地震切片证据[J].石油地球物理勘探,2009,44(6):755-759.PENG Wen-xu,SHI Hao,SUN He-feng,et al.Dextral strike-slip evidence on seismic slice for Tanlu strike-slip fault[J].Oil Geophysical Prospecting,2009,44(6):755-759.
[12]姜文亮,张景发,陈丁,等.利用遥感、重力多源信息研究郯-庐断裂带苏-鲁段构造特征[J].地球学报,2011,32(2):143-153.JANG Wen-liang,ZHANG Jing-fa,CHEN Ding,et al.Tectonic characteristics of Su-Lu segment of the Tan-Lu fault zone derived from RS and gravity multi-source information[J].Acta Geoscicutica Sinica,2011,32(2):143-153.
[13]郭良迁,薄万举,杨国华,等.华北1999-2009年水平形变应变场特征[J].大地测量与地球动力学,2011,31(3):15-19.GUO Liang-qian,BO Wan-ju,YANG Guo-hua,et al.Characteristics of horizontal deformation-strain field in north China from1999to2009[J].Journal of Geodesy and Geodynamics,2011,31(3):15-19.
[14]六省(市)震源机制小组.由震源机制解推断苏鲁皖豫地区的现今构造应力场[J].地震地质,1981,3(1):19-28.United Group of Focal Mechanism.Study of recent tectonic stress field in Jiangsu-Shandong-Anhui-Henan regions from the focal mechanism solutions[J].Seismology and Geology,1981,3(1):19-28.
[15]HAIMSON B C,CORNET F H.ISRM suggested methods for rock stress estimation.Part3:Hydraulic fracturing(HF)and/or hydraulic testing of pre-existing fractures(HTPF)[J].International Journal of Rock Mechanics&Mining Sciences,2003,(40):1011-1020.
[16]ZOBACK M D,HEALY J H.In-situ stress measurements to3.5km depth in the Cajon.Pass Scientific Research Borehole:Implications for the mechanics of crustal faulting[J].Journal of Geophysical Research,1992,97(B4):5039-5057.
[17]HAYASHI K,HAIMSON B C.Characteristics of shut-in curves in hydraulic fracturing stress measurements and determination of in situ minimum compressive stress[J].Journal of Geophysical Research,1991,96(B11):18311-18321.
[18]ZOBACK M D,HAIMSON B C.Status of the hydraulic fracturing method for in situ stress measurements[C]//The 23rd US Symposium on Rock Mechanics.Berkeley,California:American Rock Mechanics Association,1982:143-156.
[19]陈群策,毛吉震,张钧.水压致裂应力测量数据分析——对关闭压力P s值判读方法的讨论[M]//水压致裂裂缝的形成和扩展研究,北京:地震出版社,1999.
[20]丰成君,陈群策,吴满路,等.水压致裂应力测量数据分析——对瞬时关闭压力p s的常用判读方法讨论[J].岩土力学,2012,7(11):2149-2159.FENG Cheng-jun,CHEN Qun-ce,WU Man-lu,et al.Analysis of hydraulic fracturing stress measurement data—Discussion of methods frequently used to determine instantaneous shut-in pressure[J].Rock and Soil Mechanic,2012,7(11):2149-2159.
[21]BRERLEE J D.Friction of rocks[J].Pure and Applied Geophysics,1978,116(4-5).
[22]张伯崇.孔隙压力、断层滑动准则和水库蓄水的影响[C]//长江三峡坝区地壳应力与孔隙水压力综合研究.北京:地震出版社,1996.
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