基于航磁与小震精定位结果研究断裂构造特征——以攀西地区为例

doi:10.11720/wtyht.2025.1082

Abstract
Figure/Table
References
Related Citation (15)

Download: PDF (7402 KB) HTML (1 KB)
Export: BibTeX | EndNote (RIS)

Abstract

This study investigated the Panxi area as an example to delineate faults and determine their current activity levels using aeromagnetic data and precise relocation results of small earthquakes. A total of 42 faults were delineated in the study area. Among them, 21 faults were inferred to be active currently, including 10 newly inferred active faults. This study examined the three-dimensional structural characteristics of some local sections of major faults in the study area. The results indicate that precise relocation results of small earthquakes can identify highly active faults and characterize their deep structures. Additionally, based on the delineation of basement faults using aeromagnetic data, the locations of active faults were constrained, and concealed active faults within the sedimentary cover were also determined. The proposed method holds certain practical significance for promoting research on the spatial distribution and activity of fault structures using aeromagnetic data.

Key words： aeromagnetic data precise relocation of small earthquakes fault structure three-dimensional structure activity Panxi area

Received: 08 March 2024 Published: 26 February 2025

ZTFLH:

P631

	Service

	E-mail this article
	Add to my bookshelf
	Add to citation manager
	E-mail Alert
	RSS
	Articles by authors
	Jiao-Jiao LI
	Yong-Jun ZHANG
	Yi-Yuan HE
	Yi-Chuan LI
	Shi-Jun LI
	Yao CHEN

Cite this article:

Jiao-Jiao LI,Yong-Jun ZHANG,Yi-Yuan HE, et al. Investigating fault structure characteristics based on aeromagnetic data and precise relocation results of small earthquakes: A case study of the Panxi area[J]. Geophysical and Geochemical Exploration, 2025, 49(1): 206-214.

URL:

https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2025.1082 OR https://www.wutanyuhuatan.com/EN/Y2025/V49/I1/206

20?-22]
">

Geotectonic element distribution map of the study area^[20?-22]

Earthquake epicentre distribution comparison before and after earthquake relocation

Source depth distribution along East-west (A-B) direction comparison before and after earthquake relocation

编号	断裂名称	地质构造特征	磁场特征	小震分布特征	解释结果
F₂	磨盘山	断裂两侧地质构造环境不同, 控制古元古界和中元古界, 以及不同时代岩浆岩分布	磁场分界线、磁异常梯度带串珠状异常带	断裂中、南段地震震中分布较密集	走向近SN,长度131 km,一级断裂,断裂活动强烈
F₃	安宁河	对元古宇地层、沉积地层和岩浆岩分布有明显控制作用	磁场分界线、串珠状异常带	断裂局部段有地震震中分布	走向近SN,长度131 km,一级断裂,活动断裂
F₂₉	麻坪子东	位于上三叠统宝顶组	磁异常梯度带	地震震中分布较密集	走向NNW,长度9 km,三级断裂,活动断裂
F₃₂	长田	位于下侏罗统冯家河组		地震震中分布较密集	走向NW,长度8 km,三级断裂,活动断裂
F₃₄	班庄	位于二叠纪石英闪长岩南部	磁异常错动线	地震震中分布密集	走向NW,长度14 km,三级断裂,活动断裂
F₃₅	下板桥	位于二叠纪石英闪长岩中部	磁异常梯度带	北段地震震中分布密集	走向SN,长度23 km,三级断裂,活动断裂
F₃₆	矮郎河	位于三叠纪中酸性侵入岩与上三叠统白果湾组交界处	磁异常梯度带	地震震中分布密集	走向NE,长度29 km,三级断裂,活动断裂
F₃₇	马脖子	位于震旦系观音崖组、灯影组	磁异常梯度带	地震震中分布密集	走向SN,长度8 km,三级断裂,活动断裂
F₃₈	龙河西南	位于下白垩统小坝组	串珠状异常带	地震震中分布密集	走向SN,长度7 km,三级断裂,活动断裂
F₄₀	酸水河南	位于中元古界会理群	磁异常梯度带	地震震中分布密集	走向NW,长度7 km,三级断裂,活动断裂
F₄₁	发展村	位于中元古界会理群	磁异常梯度带	沿断裂有地震震中分布	走向近SN,长度30 km,三级断裂,活动断裂
F₄₂	热水塘	位于上三叠统舍资组		地震震中分布密集	走向NNW,长度10 km,三级断裂,活动断裂

List of main active faults in the study area

Synthetically inferred faults distribution map in the study area

Source depth distribution of E-F profile before and after earthquake relocation

The interactive inversion profiles distribution map of the study area

The inference interpretation map of interactive inversion profiles

The comparison map of small earthquakes segmentation and inference faults map

Fault distribution inferred by aeromagnetic and 3D display map of earthquakes distribution

[8]	Hu X J, Chen X J, Wu Y, et al. An analysis of the fault framework in southern Ningxia based on geophysical data[J]. Geophysical and Geochemical Exploration, 2023, 47(4):916-925.
[9]	张永军, 邓茂盛, 李皎皎, 等. 攀枝花——安益地区1∶5万航磁调查成果报告[R]. 中国国土资源航空物探遥感中心, 2015.
[9]	Zhang Y J, Deng M S, Li J J, et al. Report of 1∶50,000 aeromagnetic survey in Panzhihua-Anyi area[R]. China Aero Geophysical Survey and Remote Sensing Center for Land and Resource, 2015.
[10]	张广伟, 雷建设, 谢富仁, 等. 华北地区小震精定位及构造意义[J]. 地震学报, 2011, 33(6):699-714,843.
[10]	Zhang G W, Lei J S, Xie F R, et al. Precise relocation of small earthquakes occurred in North China and its tectonic implication[J]. Acta Seismologica Sinica, 2011, 33(6):699-714,843.
[11]	李乐, 陈棋福, 陈颙. 首都圈地震活动构造成因的小震精定位分析[J]. 地球物理学进展, 2007, 22(1):24-34.
[11]	Li L, Chen Q F, Chen Y. Relocated seismicity in Big Beijing area and its tectonic implication[J]. Progress in Geophysics, 2007, 22(1):24-34.
[12]	Waldhauser F, Ellsworth W L. A double-difference earthquake location algorithm:Method and application to the Northern Hayward fault,California[J]. The Bulletin of the Seismological Society of America, 2000, 90(6):1353-1368.
[13]	Fukuyama E, Ellsworth W L, Waldhauser F, et al. Detailed fault structure of the 2000 western Tottori,Japan,earthquake sequence[J]. Bulletin of the Seismological Society of America, 2003, 93(4):1468-1478.
[14]	杨智娴, 陈运泰. 用双差地震定位法再次精确测定1998年张北—尚义地震序列的震源参数[J]. 地震学报, 2004, 26(2):115-120.
[14]	Yang Z X, Chen Y T. Relocation of the 1998 Zhangbei-Shangyi earth-quake sequence using the double difference earthquake location algorithm[J]. Acta Seismologica Sinica, 2004, 26(2):115-120.
[15]	于湘伟, 陈运泰, 张怀. 京津唐地区中小地震重新定位[J]. 地震学报, 2010, 32(3):257-269.
[15]	Yu X W, Chen Y T, Zhang H. Relocation of earthquakes in Beijing-Tianjin-Tangshan region with double-difference tomography technique[J]. Acta Seismologica Sinica, 2010, 32(3):257-269.
[16]	朱艾斓, 徐锡伟, 任烨, 等. 中国东南部地区背景地震重新定位及隐伏活动构造初步研究[J]. 地震地质, 2017, 39(1):67-80.
[16]	Zhu A L, Xu X W, Ren Y, et al. Relocation of the background seismicity and investigation on the buried active faults in Southeastern China[J]. Seismology and Geology, 2017, 39(1):67-80.
[17]	朱艾斓, 徐锡伟, 周永胜, 等. 川西地区小震重新定位及其活动构造意义[J]. 地球物理学报, 2005, 48(3):629-636.
[17]	Zhu A L, Xu X W, Zhou Y S, et al. Relocation of small earthquakes in western Sichuan,China and its implications for active tectonics[J]. Chinese Journal of Geophysics, 2005, 48(3):629-636.
[18]	傅莺, 龙锋. 2008年攀枝花6.1级地震序列精定位[J]. 中国地震, 2015, 31(1):56-64.
[18]	Fu Y, Long F. The 2008 Panzhihua Ms6.1 earthquake sequence relocation[J]. Earthquake Research in China, 2015, 31(1):56-64.
[19]	傅莺, 龙锋, 王世元. 川滇菱形块体东边界地震精定位[J]. 中国地震, 2018, 34(1):60-70.
[19]	Fu Y, Long F, Wang S Y. Precise location of earthquakes at the eastern boundaries of diamond block of Sichuan-Yunnan[J]. Earthquake Research in China, 2018, 34(1):60-70.
[20]	四川省地质矿产局. 四川省区域地质志[M]. 北京: 地质出版社,1991.
[20]	Bureau of Geology and Mineral Resources of Sichuan Province. Regional geology of Sichuan Province[M]. Beijing: Geological Publishing House,1991.
[21]	刘家铎, 张成江, 李佑国, 等. 攀西地区金属成矿系统[M]. 北京: 地质出版社, 2007.
[21]	Liu J D, Zhang C J, Li Y G, et al. Mineralization system of metallic deposit in Panxi region[M]. Beijing: Geological Publishing House, 2007.
[22]	M7专项工作组. 中国大陆大地震中—长期危险性研究[M]. 北京: 地震出版社, 2012.
[1]	邓起东, 徐锡伟, 张先康, 等. 城市活动断裂探测的方法和技术[J]. 地学前缘(中国地质大学,北京), 2003, 10(1):93-104.
[1]	Deng Q D, Xu X W, Zhang X K, et al. Methods and techniques for surveying and prospecting active faults in urban areas[J]. Earth Science Frontiers (China University of Geosciences,Beijing), 2003, 10(1):93-104.
[22]	M7 Special Working Group. Study on the mid-to long-term potential of large earthquakes on the Chinese continent[M]. Beijing: Seismological Press, 2012.
[23]	熊绍柏, 郑晔, 尹周勋, 等. 丽江—攀枝花—者海地带二维地壳结构及其构造意义[J]. 地球物理学报, 1993, 36(4):434-444.
[2]	张先, 赵丽. 利用磁异常解析方法试验研究城市断裂[J]. 地震地质, 2007, 29(2):336-353.
[2]	Zhang X, Zhao L. A test study of urban faults using analytical method of magnetic anomaly[J]. Seismology and Geology, 2007, 29(2):336-353.
[23]	Xiong S B, Zheng Y, Yin Z X, et al. The 2D structure and it’s tectonic implications of the crust in the Lijiang-Panzhihua-Zhehai region[J]. Chinese Journal of Geophysics, 1993, 36(4):434-444.
[24]	范正国, 黄旭钊, 熊盛青, 等. 磁测资料应用技术要求[M]. 北京: 地质出版社, 2010.
[3]	郑广如, 卢建中, 余学中. 内蒙古得耳布尔北部地区航磁反映的断裂构造和岩性特征[J]. 物探与化探, 2004, 28(5):388-393.
[3]	Zheng G R, Lu J Z, Yu X Z. Fault structures and lithologic characters reflected by aeromagnetic survey in northern derbur,Inner Mongolia[J]. Geophysical and Geochemical Exploration, 2004, 28(5):388-393.
[24]	Fan Z G, Huang X Z, Xiong S Q, et al. Technical requirements for application of magnetic survey data[M]. Beijing: Geological Publishing House, 2010.
[25]	程远志, 汤吉, 陈小斌, 等. 南北地震带南段川滇黔接壤区电性结构特征和孕震环境[J]. 地球物理学报, 2015, 58(11):3965-3981.
[4]	范正国, 方迎尧, 王懋基, 等. 航空物探技术在1:25万区域地质调查中的应用[J]. 物探与化探, 2007, 31(6):504-509.
[4]	Fan Z G, Fang Y Y, Wang M J, et al. The application of aerogeophysical techniques to 1:250 000 regional geological mapping[J]. Geophysical and Geochemical Exploration, 2007, 31(6):504-509.
[5]	张永军, 张开均. 根据航磁数据探讨阿尔金断裂带的结构及构造演化[J]. 物探与化探, 2007, 31(6):489-494.
[5]	Zhang Y J, Zhang K J. Evolution of the Altyn tagh fault based on aeromagnetic data[J]. Geophysical and Geochemical Exploration, 2007, 31(6):489-494.
[6]	张玄杰, 郑广如, 范子梁, 等. 新疆西天山东段航磁推断断裂构造特征[J]. 物探与化探, 2011, 35(4):448-454.
[6]	Zhang X J, Zheng G R, Fan Z L, et al. Structural characteristics of aeromagnetic deduced faults in western Tianshan mountains,Xinjiang[J]. Geophysical and Geochemical Exploration, 2011, 35(4):448-454.
[7]	熊盛青, 丁燕云, 李占奎. 西藏及西南三江深断裂构造格局新认识[J]. 地球物理学报, 2014, 57(12):4097-4109.
[7]	Xiong S Q, Ding Y Y, Li Z K. A new understanding on the pattern of deep faults in Xizang and the southwestern Sanjiang area[J]. Chinese Journal of Geophysics, 2014, 57(12):4097-4109.
[25]	Cheng Y Z, Tang J, Chen X B, et al. Electrical structure and seismogenic environment along the border region of Yunnan,Sichuan and Guizhou in the south of the North-South seismic belt[J]. Chinese Journal of Geophysics, 2015, 58(11):3965-3981.
[8]	虎新军, 陈晓晶, 仵阳, 等. 基于地球物理资料的宁夏南部地区断裂格架特征分析[J]. 物探与化探, 2023, 47(4):916-925.