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ISSN 0253-3782 CN 11-2021/P

郯庐断裂带中段三维密度结构反演与解释

翟丽娜 贾晓东 孔祥瑞 邵媛媛 杨牧萍 王喜龙 腾藤

引用本文: 翟丽娜, 贾晓东, 孔祥瑞, 邵媛媛, 杨牧萍, 王喜龙, 腾藤. 2019. 郯庐断裂带中段三维密度结构反演与解释. 地震学报, 41(4): 472-483. doi: 10.11939/jass.20180071 shu
Citation:  Zhai Lina, Jia Xiaodong, Kong Xiangrui, Shao Yuanyuan, Yang Muping, Wang Xilong, Teng Teng. 2019. Inversion for 3D density structure in the middle segment of Tanlu fault zone and its implication. Acta Seismologica Sinica41(4): 472-483. doi: 10.11939/jass.20180071 shu

郯庐断裂带中段三维密度结构反演与解释

    通讯作者: 贾晓东, jxd.dx@163.com
摘要: 为深入理解研究区的构造运动规律,进一步探求地壳物质可能的运移模式,本文基于Crust1.0地壳结构模型和最新莫霍面深度模型对自由空气重力异常数据进行联合约束,采用三维重力反演技术得到了郯庐断裂带中段的三维密度结构。反演结果显示,研究区的背景场稳定,断裂构造发育部位表现为重力密度低值,特别是营潍断裂带正处于大范围的重力密度低值区并纵贯整个研究区,由此可推断重力密度低值区可指示断裂构造的存在。

English

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  • 图 1  研究区构造分布(邓起东等,2010

    Figure 1.  Structure distribution in the studied area (after Deng et al,2010

    图 2  郯庐断裂带中段及周边布格重力异常特征图

    Figure 2.  Characteristics of Bouguer gravity anomalies in the middle segment of Tanlu fault zone and its surrounding regions

    图 3  沿37°N (a)和41°N (b)东西向剖面的Crust1.0地壳密度模型

    Figure 3.  Crustal density model by Crust1.0 along the latitude 37°N (a) and 41°N (b)

    图 4  郯庐断裂带中段及附近壳内剩余密度异常体的重力异常特征

    Figure 4.  The gravity anomaly of residual density bodies in the crust in the middle segment of Tanlu fault zone and its vicinity

    图 5  三维重力反演结果在12 km深度处的水平密度结构切片

    Figure 5.  The density structure slice derived from the gravity inversion result at the depth of 12 km

    图 6  研究区重力异常分布与1970年以来MS≥5.0地震关系图

    Figure 6.  Relationship between gravity anomaly distribution and MS≥5.0 earthquakes since 1970 in the studied area

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  • 通讯作者:  贾晓东, jxd.dx@163.com
  • 收稿日期:  2018-05-31
  • 录用日期:  2019-05-23
  • 网络出版日期:  2019-07-01
通讯作者: 陈斌, bchen63@163.com
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