利用陆态网络基准站资料研究山西断陷带近期地壳形变特征
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摘要
利用陆态网络GPS基准站资料计算了山西断陷带内部以及相对于周边地块的基线时间序列,并基于均匀应变模型计算了山西北部至晋冀交界和山西南部至晋豫交界的应变时间序列,结果表明:(1)陆态网络山西基准站观测数据质量较高,能够在一定程度上反映山西断陷带的地壳微动态变化特征。(2)山西北部至晋冀交界区域第一剪应变和最小主应变自2012年10月起减小,山西大同至河北张家口和山西大同至北京延庆的基线同期出现缩短,可能表明该区域北东向的右旋剪切和压性应变在逐渐增强。(3)山西北部至晋冀交界区域张性剪切应变2014年5月起出现的短期增强与涿鹿4.3级地震震源机制较为一致,可能与此次地震有关,该短期变化在震后逐渐恢复。
The baseline time sequence inside Shanxi fault subsidence zone and relative to the surrounding geological block is calculated,and calculated the strain time sequence based on block uniform strain model from the northern part of Shanxi to Shanxi- Hebei junction and from southern part of Shanxi to Shanxi- Henan junction is calculated,the results show as following:( 1) The observation data of CMONOC is high in quality,it is able to monitor the crustal micro dynamic deformation of Shanxi fault subsidence zone in some degree;( 2)The first shear strain and minimum principal strain of the area from the northern part of Shanxi to Shanxi- Hebei junction decrease from the beginning of October,2012,the baseline from Shanxi Datong to Hebei Shijiazhuang and Beijing Yanqing is shortened in the same time,which may indicate that the compressive and dextral shear strain in north- east is increasing.( 3) The short term increasing of tensile shear strain in May,2014 from the northern part of Shanxi to Shanxi- Hebei junction is consisted with the focal mechanism of Zhuolu M4.3earthquake,which may be related with this earthquake,and the short term changes recover gradually after the earthquake.
引文
[1]殷海涛,李杰,张玲,等.基于GPS观测网的山东地区地壳运动特征分析[J].西北地震学报,2008,30(3):276-281.
    [2]蔡华,孙汉荣,赵齐乐,等.GPS测定的2011年日本9.0级地震的中国大陆地区同震位移场[J].武汉大学学报:信息科学版,2012,37(8):953-955.
    [3]范士杰,刘炎雄,王振杰.日本3·11特大地震的GPS震时和震后响应[J].武汉大学学报:信息科学版,2012,37(2):310-313.
    [4]武艳强,江在森,杨国华.最小二乘配置方法在提取GPS时间序列信息中的应用[J].国际地震动态,2007(7):99-10.
    [5]孔祥元,郭际明,刘宗泉,等.大地测量学基础[M].武汉:武汉大学出版社,2001:10-180.

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