滇西地区现今垂直形变演化特征
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摘要
通过对滇西地区1981～1992年、1992～2001两个时段的垂直形变场演化分析,认为:1981～1992年是滇西地区垂直差异运动最为剧烈的时期。就活动区域而言,主要在红河断裂以东,一个是滇西北裂陷区(其内部仍存在差异性,丽江—小金河断裂活动要强于程海断裂);另一个地区就是滇中地块的的姚安、大姚、永仁以及会理地区。1992～2001年滇西地区垂直差异运动明显减弱,但红河断裂以西的隆起区活动有一定程度增强。最后,结合滇西地区的地震活动、动力背景进行了综合分析,对造成这两个时段形变差异的原因进行了探讨。
We analyzed the evolution of vertical deformation field in two terms, 1981-1992 and 1992-2001, in West Yunnan, and the result shows that the vertical crustal difference movement was stronger in the first term. In this term there were two main active regions in the east of the Red River fault: the split-sink zone in Northwest Yunnan and the Yaoan, Dayao, Yongren and Huili areas in Middle-Yunnan block mass. In the second term, the vertical crustal movement east of the Red River fault became weaker apparently, but that in the uplift area west of the Red River fault increased to a certain extent. Combined with the seismicity and dynamic background in West Yunnan, the cause of the different deformation in two terms was discussed comprehensively.
We analyzed the evolution of vertical deformation field in two terms, 1981-1992 and 1992-2001, in West Yunnan, and the result shows that the vertical crustal difference movement was stronger in the first term. In this term there were two main active regions in the east of the Red River fault: the split-sink zone in Northwest Yunnan and the Yaoan, Dayao, Yongren and Huili areas in Middle-Yunnan block mass. In the second term, the vertical crustal movement east of the Red River fault became weaker apparently, but that in the uplift area west of the Red River fault increased to a certain extent. Combined with the seismicity and dynamic background in West Yunnan, the cause of the different deformation in two terms was discussed comprehensively.
引文
[1]云南省地震局滇西地震预报试验场.一九九六年丽江地震[M].北京:地震出版社,1998.
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[3]虢顺民,向宏发,计风桔,等.红河断裂带第四纪右旋走滑与尾端拉张转换关系研究[J].地震地质,1996,18(4):301-309.
[4]江在森,巩守文.水准网的分段速率整体平差[J].武汉测绘科技大学学报,1994,13(1):60-65.
[5]张希,江在森,张四新.借助最小二乘配置整体解算地壳视应变场[J].地壳形变与地震,18(2):57-62.
[6]张国民,李丽,石耀霖.地壳应变速率与地震活动关系的研究—从地壳应变场探索强震活动的场源关系[J].中国地震,1999,15(1):1-13.
[7]张祖胜,尤晓青.垂直形变速率梯度图的编绘[J].地震,1996,16(3):232-238.
[8]张四新,王双绪,陈兵,等.地震前后垂直形变场动态演化的量化指标[J].大地测量与地球动力学,2004,24(3):35-39.
[9]阚荣举,张四昌,晏凤桐,等.我国西南地区现代构造应力场与现代构造活动特征的探讨[J].地球物理学报,1977,20(2):96-110.
[10]阚荣举,王绍晋,黄雍,等.中国西南地区现代构造应力场与板内断块相对运动[J].地震地质,1983,5(2):79-90.
[11]巩守文.陕甘宁青地区块体交接带上大地垂直形变演化特征与块体运动[J].地球物理学报,1995,38(3):329-338.
[12]江在森,王双绪,赵振才.南北地震带和青藏块体东部近期大地形变与地震特征[J].中国地震,1997,13(2):139-150.
[13]张四新,刘文义,王双绪.四川西部现今地壳形变与地震[J].地壳形变与地震,1998,18(4):48-54.
[14]石绍先,曹刻,徐彦,等.云南楚雄地区成组强震与单个强震的前兆差异性研究[J].地震研究,2004,27(2):112-118.
[2]国家地震局地质研究所,云南省地震局.滇西北活动断裂[M].北京:地震出版社,1990.
[3]虢顺民,向宏发,计风桔,等.红河断裂带第四纪右旋走滑与尾端拉张转换关系研究[J].地震地质,1996,18(4):301-309.
[4]江在森,巩守文.水准网的分段速率整体平差[J].武汉测绘科技大学学报,1994,13(1):60-65.
[5]张希,江在森,张四新.借助最小二乘配置整体解算地壳视应变场[J].地壳形变与地震,18(2):57-62.
[6]张国民,李丽,石耀霖.地壳应变速率与地震活动关系的研究—从地壳应变场探索强震活动的场源关系[J].中国地震,1999,15(1):1-13.
[7]张祖胜,尤晓青.垂直形变速率梯度图的编绘[J].地震,1996,16(3):232-238.
[8]张四新,王双绪,陈兵,等.地震前后垂直形变场动态演化的量化指标[J].大地测量与地球动力学,2004,24(3):35-39.
[9]阚荣举,张四昌,晏凤桐,等.我国西南地区现代构造应力场与现代构造活动特征的探讨[J].地球物理学报,1977,20(2):96-110.
[10]阚荣举,王绍晋,黄雍,等.中国西南地区现代构造应力场与板内断块相对运动[J].地震地质,1983,5(2):79-90.
[11]巩守文.陕甘宁青地区块体交接带上大地垂直形变演化特征与块体运动[J].地球物理学报,1995,38(3):329-338.
[12]江在森,王双绪,赵振才.南北地震带和青藏块体东部近期大地形变与地震特征[J].中国地震,1997,13(2):139-150.
[13]张四新,刘文义,王双绪.四川西部现今地壳形变与地震[J].地壳形变与地震,1998,18(4):48-54.
[14]石绍先,曹刻,徐彦,等.云南楚雄地区成组强震与单个强震的前兆差异性研究[J].地震研究,2004,27(2):112-118.
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