昔格达断裂晚第四纪活动特征及强震复发周期
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摘要
利用冲沟、山脊等断错构造地貌的DEM影像资料和详实的野外踏勘,详细分析了昔格达断裂的晚第四纪活动特征。结果显示:断裂线两侧的河沟和山脊地貌呈"S"或反"Z"形或以多个首尾连接的"S"形雁列式斜列,断裂活动为左行左列式,断层上发育多个拉分盆地和断裂湖;该断裂最新活动时间晚于(12.83±1.09)ka,为全新世走滑活动断裂,倾滑分量不大,倾向总体西倾,且晚更新世以来的左旋走滑速率约为1.70 mm/a;依据断裂线地震遗迹及断裂活动特征,断裂强活动复发间隔大致为10~12 ka或更短。
The paper studied the Late Quaternary activity of the Xigeda fault carefully based on the geomorphologic analysis of the landsat ETM data combined with field tectono-geomorphic observations and measurement.Results reveal that shape of the rivers and ridges along the fault showed the "S" or anti-"Z",or more "S"shape,which are end to end connected with each other,and an echelon oblique columns;the faulting way is sinistral strike slip with left step,and a series of pull-apart basins and fracture lakes(lake distributed popularly)developed;that as Holocene active strike-slip fault,its latest active time was later than(12.83±1.09) ka,generally,which is west dipping,with smaller(trend) strike-slip component and slip rates of 1.70 mm/a since late Pleistocene;that according to the seismic remnant and active characteristics of the fault,recrudescing interval of the fault activity is 10-12 ka or shorter.
The paper studied the Late Quaternary activity of the Xigeda fault carefully based on the geomorphologic analysis of the landsat ETM data combined with field tectono-geomorphic observations and measurement.Results reveal that shape of the rivers and ridges along the fault showed the "S" or anti-"Z",or more "S"shape,which are end to end connected with each other,and an echelon oblique columns;the faulting way is sinistral strike slip with left step,and a series of pull-apart basins and fracture lakes(lake distributed popularly)developed;that as Holocene active strike-slip fault,its latest active time was later than(12.83±1.09) ka,generally,which is west dipping,with smaller(trend) strike-slip component and slip rates of 1.70 mm/a since late Pleistocene;that according to the seismic remnant and active characteristics of the fault,recrudescing interval of the fault activity is 10-12 ka or shorter.
引文
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[13]康来迅.中国南北地震带的基本特征及其形成机理之探讨[J].地壳形变与地震,1991,11(4):76-85.
[14]震害防御处.禄丰县、元谋县交界处5.1级地震构造图[EB/OL].(2010-02-25)[2011-04-29].http://www.cnr.cn/gundong/201002/t20100225_506061929.html.
[2]张寿庭,徐旃章.云南宁蒗地区区域构造格局及其演化规律及地质热事件[J].成都理工学院学报,1994,21(4):17-21.
[3]卢海峰,王瑞,赵俊香,等.元谋断裂晚第四纪活动特征及其构造应力分析[J].第四纪研究,2009,29(1):173-181.
[4]万天丰,王明明,殷秀兰,等.渤海湾地区不同方向断裂带的封闭性[J].现代地质,2004,18(2):157-163.
[5]万天丰,朱鸿.中国大陆及邻区中生代—新生代大地构造与环境变迁[J].现代地质,2002,16(2):107-120.
[6]卢海峰,何仲太,赵俊香,等.元谋断裂晚第四纪活动性定量分析[J].地球科学:中国地质大学学报,2008,33(6):852-860.
[7]万天丰,郝天珧.黄海新生代构造及油气勘探前景[J].现代地质,2009,23(3):385-393.
[8]付碧宏,二宫芳树,董彦芳,等.三维卫星遥感图像生成技术及其在第四纪构造地貌研究中的应用[J].第四纪研究,2008,28(2):189-196.
[9]蒋长胜,郑勇.中国大陆部分5级以上地震震源机制解[EB/OL].[2011-04-12].http://124.17.4.5/.
[10]申旭辉,汪一鹏.云南元谋地区新构造运动基本特征[M]//邓起东.活动断裂研究.北京:地震出版社,1991:131-139.
[11]古宾ИE,松田时彦.活断层研究[M].沈德富,等译.北京:地震出版社,1983:1-258.
[12]熊熊,王继业,滕吉文.青藏高原新生代火山活动的深部力学背景[J].地球科学:中国地质大学学报,2007,32(1):1-6.
[13]康来迅.中国南北地震带的基本特征及其形成机理之探讨[J].地壳形变与地震,1991,11(4):76-85.
[14]震害防御处.禄丰县、元谋县交界处5.1级地震构造图[EB/OL].(2010-02-25)[2011-04-29].http://www.cnr.cn/gundong/201002/t20100225_506061929.html.
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