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《地震研究》[ISSN:1000-0666/CN:53-1062/P]

卷:

47

期数:

2024年03期

页码:

391-404

栏目:

综述

出版日期:

2024-05-01

文章信息/Info

Title:

Focal Parameters and Seismogenic Structure of Two Earthquake Sequences in Yanjin,Yunnan

作者:

顾慧冬¹; 2; 姜金钟¹; 2; 3; 李 姣¹; 张 演¹; 3; 杨跃文¹; 王光明¹; 3; 张 帅¹; 3; 姚 远¹; 3

(1.云南省地震局,云南 昆明 650224; 2.云南大学 地球科学学院,云南 昆明 650504; 3.中国地震局昆明地震预报研究所,云南 昆明 650224)

Author(s):

GU Huidong¹; 2; JIANG Jinzhong¹; 2; 3; LI Jiao¹; ZHANG Yan¹; 3; YANG Yuewen¹; WANG Guangming¹; 3; ZHANG Shuai¹; 3; YAO Yuan¹; 3

(1.Yunnan Earthquake Agency,Kunming 650224,Yunnan,China;2.School of Earth Sciences,Yunnan University,Kunming 650504,Yunnan,China;3.Kunming Institute of Prediction,China Earthquake Administration,Kunming 650224,Yunnan,China)

关键词:

盐津地震序列;  震源机制解;  重定位;  sPn震相;  发震构造

Keywords:

the Yanjin earthquake sequence;  focal mechanism;  relocation;  sPn phase;  seismogenic structure

分类号:

P315.332

DOI:

10.20015/j.cnki.ISSN1000-0666.2024.0040

摘要:

2021年1月23日云南盐津发生M_L5.2地震,在此次地震前后该区域已经发生了多次中小地震。为了更好地评估该地区的地震危险性及识别发震构造,利用云南和四川地震台网的近震波形资料,采用CAP方法和2种速度模型反演了盐津M_L≥3.5地震的震源机制解和震源深度,结合sPn深度震相测定了盐津M_L5.2地震的震源深度,最后采用双差定位法对盐津地震序列进行重定位。结果表明:①最大震级为M_L5.2的“孤立型”地震序列发震断层为逆断层,走向近SN向、倾向东、倾角约50°,是一次沿断层面自下而上破裂较为充分的浅源地震; ②最大震级为M_L3.9的“震群型”地震序列发震断层为走滑型断层,走向为NNW向、倾向北东、倾角约为80°,该序列内3次M_L≥3.5地震的震源机制解略有差异,可能是由于该区域复杂的断层结构和应力环境影响所致; ③最大震级为M_L3.9的“震群型”地震序列的发震断层可能为盐津—筠连断裂,而最大震级为M_L5.2的“孤立型”地震序列的发震断层可能为华蓥山断裂与盐津—筠连断裂共同作用产生的一条未知隐伏断裂。

Abstract:

Before and after the M_L5.2 earthquake in Yanjin,Yunnan Province on 23 January 2021,several medium and small earthquakes occurred in this region.In order to better assess the seismic hazard and identify the seismogenic structures in this region,we use the waveform data of the near earthquakes from the Yunnan Seismic Network and the Sichuan Seismic Network to invert the focal mechanisms and the depths of the M_L≥3.5 earthquakes in Yanjin by the cut-and-paste(CAP)method and two different velocity models.Then,we determine the depth of the M_L5.2 earthquake using the depth phase sPn.Finally,we employ the double-difference relocation method to relocate the earthquake sequences in Yanjin.We obtain that seismogenic fault of the isolated M_L5.2 earthquake sequence belongs to the thrust type.It strikes near the N-S direction and dips eastward at 50°.The M_L5.2 earthquake has a shallow source,the rupture occurred from the bottom to the top along the fault plane.The seismogenic fault of the swarm-type M_L3.9 earthquake sequence belongs to the strike-slip type.It strikes from NNW and dips northeastward at about 80°.The focal mechanisms of the three M_L≥3.5 earthquakes in this swarm-type sequence are slightly different,this may be due to the region's complex fault structure and stress environment.Based on this analysis,we believe that the seismogenic fault of the M_L3.9 earthquake sequence is the Yanjin-Junlian fault.The seismogenic fault of the M_L5.2 earthquake sequence is an unknown hidden fault in the near N-S direction and with a dip angle of about 50°,which is generated by the Huayingshan fault and the Yanjin-Junlian fault.

参考文献/References:

常祖峰,周荣军,安晓文,等.2014.昭通—鲁甸断裂晚第四纪活动及其构造意义[J].地震地质,36(4):1260-1279.
Chang Z F,Zhou R J,An X W,et al.2014.Late-Quaternary activity of the Zhaotong-Ludian Fault zone and its tectonic implication[J].Seismology and Geology,36(4):1260-1279.(in Chinese)
崔效锋,谢富仁.1999.利用震源机制解对中国西南及邻区进行应力分区的初步研究[J].地震学报,21(5):513-522.
Cui X F,Xie F R.1999.Preliminary research to determine stress districts from focal mechanism solutions in southwest China and its adjacent area[J].Acta Seismologica Sinica,21(5):513-522.(in Chinese)
邓起东,张培震,冉勇康,等.2002.中国活动构造基本特征[J].中国科学:地球科学,32(12):1020-1030.
Deng Q D,Zhang P Z,Ran Y K,et al.2002.Basic characteristics of active tectonics of China[J].Science China Earth Sciences,32(12):1020-1030.(in Chinese)
杜异军,马瑾.1986.“入”字式断层声发射b值及震级-频度关系的物理意义[J].地震地质,8(2):1-20,99.
Du Y J,Ma J.1986.The b-value of acoustic emission for the sample with “λ”-pattern cracks and the physical significance of the frequency-magnitude relation[J].Seismology and Geology,8(2):1-20,99.(in Chinese)
樊文杰,左可桢,赵翠萍,等.2023.2021年6月10日云南双柏地震序列发震构造分析[J].地球物理学报,66(5):1991-2006.
Fan W J,Zuo K Z,Zhao C P,et al.2023.Analysis of seismogenic structure of Yunnan Shuangbai earthquake sequence on June 10,2021[J].Chinese Journal of Geophyiscs,66(5):1991-2006.(in Chinese)
房立华,吴建平,王长在,等.2013.2012年新疆新源M_S6.6地震余震序列精定位研究[J].中国科学:地球科学,43(12):1929-1933.
Fang L H,Wu J P,Wang C Z,et al.2013.Relocation of the 2012 M_S6.6 Xinjiang Xinyuan earthquake sequence[J].Science China Earth Sciences,43(12):1929-1933.(in Chinese)
房明山,杜安陆,董孝平,等.1995.用sPn震相测定近震震源深度[J].地震地磁观测与研究,16(5):13-18.
Fang M S,Du A L,Dong X P,et al.1995.Determination of focal depth with the sPn phase[J].Seismological and Geomagnetic Observation and Research,16(5):13-18.(in Chinese)
付虹,黄浩,李丽,等.2011.2011年3月10日云南盈江5.8级地震序列研究[J].地震研究,34(4):414-419.
Fu H,Huang H,Li L,et al.2011.Research of the Mar.10,2011,M_S5.8,Yingjiang,Yunnan Earthquake Sequence[J].Journal of Seismological Research,34(4):414-419.(in Chinese)
洪德全,王行舟,倪红玉,等.2013.多种方法研究2012年7月20日江苏高邮M_S4.9级地震震源机制解和震源深度[J].地球物理学进展,28(4):1757-1765.
Hong D Q,Wang X Z,Ni H Y,et al.2013.Focal mechanism and focal depth of July 20,2012 Jiangsu Gaoyou M_S4.9 earthquake[J].Progress in Geophysics,28(4):1757-1765.(in Chinese)
姜金钟,付虹,李涛.2021.2021年云南漾濞M_S6.4地震序列重定位及发震构造探讨[J].地震研究,44(3):320-329.
Jiang J Z,Fu H,Li T.2021.Relocation of the 2021 Yangbi,Yunnan M_S6.4 earthquake sequence and discussion of its seismogenic fault[J].Journal of Seismological Research,44(3):320-329.(in Chinese)
蒋海昆,杨马陵,付虹,等.2015.震后趋势判定参考指南[M].北京:地震出版社.
Jiang H K,Yang M L,Fu H,et al.2015.Reference guide for estimating post-earthquake trend[M].Beijing:Seismological Press.(in Chinese)
蒋海昆,王锦红.2023. 适用于机器学习的地震序列类型判定特征重要性讨论[J].地震研究,46(2):155-172.
Jiang H K,Wang J H.2023. Discussion on the importance of the features for the judgement of earthquake sequence types applicable to machine learning[J].Journal of Seismological Earthquake,46(2):155-172.(in Chinese)
李丹宁,高洋,朱慧宇,等.2017.2014年云南景谷M_S6.6地震序列双差定位及震源机制解特征研究[J].地震研究,40(3):465-473.
Li D N,Gao Y,Zhu H Y,et al.2017.Research on double-difference relocations and focal mechanism solutions of the 2014 Yunnan Jinggu M_S6.6 earthquake sequence[J].Journal of Seismological Research,40(3):465-473.(in Chinese)
李姣,姜金钟,王光明,等.2021.2018年云南通海2次M_S5.0地震震源机制解及深度测定[J].地震研究,44(2):133-144.
Li J,Jiang J Z,Wang G M,et al.2021.Focal mechanism and focal depth determination of the two Tonghai,Yunnan,M_S5.0 Earthquakes in 2018[J].Journal of Seismological Research,44(2):133-144.(in Chinese)
李姣,姜金钟,杨晶琼.2020.2017年漾濞M_S4.8和M_S5.1地震序列的微震检测及重定位[J].地震学报,42(5):527-542.
Li J,Jiang J Z,Yang J Q.2020.Microseismic detection and relocation of the 2017 M_S4.8 and M_S5.1 Yangbi earthquake sequence,Yunnan[J].Acta Seismologica Sinica,42(5):527-542.(in Chinese)
刘正荣,雷素华,胡素华.1977.1974年5月11日云南省永善—大关地震[J].地球物理学报,20(2):110-114.
Liu Z R,Lei S H,Hu S H.1977.The Yongshan-Daguan Earthquake(M=7.1)on May 11,1974[J].Chinese Journal of Geophyiscs,20(2):110-114.(in Chinese)
吕坚,郑秀芬,肖健,等.2013.2012年9月7日云南彝良M_S5.7、M_S5.6地震震源破裂特征与发震构造研究[J].地球物理学报,56(8):2645-2654.
Lyu J,Zheng X F,Xiao J,et al.2013.Rupture characteristics and seismogenic structures of the M_S5.7 and M_S5.6 Yiliang earthquake of Sep.7,2012[J].Chinese Journal of Geophyiscs,56(8):2645-2654.(in Chinese)
吕俊强.2013.利用sPn与Pn震相的到时差计算震源深度[J].大地测量与地球动力学,33(S1):45-48.
Lyu J Q.2013.Analysis on seismic source depth determination using travel time difference of sPn and Pn phase[J].Juornal of Geodesy and Geodynamics,33(S1):45-48.(in Chinese)
马瑾,马胜利,刘力强,等.2002.断层相互作用型式的实验研究[J].自然科学进展,12(5):57-62.
Ma J,Ma S L,Liu L Q,et al.2002.Experimental study on patter fault interaction[J].Progress in Natural Science,12(5):57-62.(in Chinese)
毛泽斌,常祖峰,李鉴林,等.2019.景谷M6.6地震震中区断裂晚第四纪活动[J].地震地质,41(4):821-836.
Mao Z B,Chang Z F,Li J L,et al.2019.Late Quaternary activity of faults in the epicenter area of Jinggu M6.6 Earthquake[J].Seismology and Geology,41(4):821-836.(in Chinese)
潘睿,姜金钟,付虹,等.2019.2017年云南漾濞M_S5.1及M_S4.8地震震源机制解和震源深度测定[J].地震研究,42(3):338-348.
Pan R,Jiang J Z,Fu H,et al.2019.Focal mechanism and focal determination of Yunnan Yangbi M_S5.1 and M_S4.8 earthquakes in 2017[J].Journal of Seismological Research,42(3):338-348.(in Chinese)
任克新,邹立晔,刘瑞丰,等.2004.用sPn计算内蒙地震的震源深度[J].地震地磁观测与研究,25(3):24-31.
Ren K X,Zou L Y,Liu R F,et al.2004.Application of sPn to focal depth determination in Inner Mongolia[J].Seismological and Geomagnetic Observation and Research,25(3):24-31.(in Chinese)
孙茁,吴建平,房立华,等.2014.利用sPn震相测定芦山M_S7.0级地震余震的震源深度[J].地球物理学报,57(2):430-440.
Sun Z,Wu J P,Fang L H,et al.2014.Focal depth determination of aftershocks of Lushan M_S7.0 earthquake from sPn phase[J].Chinese Journal of Geophyiscs,57(2):430-440.(in Chinese)
万永革,黄少华,王福昌,等.2023.2022年门源地震序列揭示的断层几何形状及滑动特性[J].地球物理学报,66(7):2796-2810.
Wan Y G,Huang S H,Wang F C,et al.2023.Fault geometry and slip characteristics revealed by the 2022 Menyuan earthquake sequence[J].Chinese Journal of Geophyiscs,66(7):2796-2810.(in Chinese)
万永革,沈正康,刁桂苓,等.2008.利用小震分布和区域应力场确定大震断层面参数方法及其在唐山地震序列中的应用[J].地球物理学报,51(3):793-804.
Wan Y G,Shen Z K,Diao G L,et al.2008.An algorithm of fault parameter determination using distribution of small earthquakes and parameters of regional stress field and its application to Tangshan earthquake sequence[J].Chinese Journal of Geophyiscs,51(3):793-804.(in Chinese)
王光明,吴中海,彭关灵,等.2021.2021年5月21日漾濞M_S6.4地震的发震断层及其破裂特征:地震序列的重定位分析结果[J].地质力学学报,27(4):662-678.
Wang G M,Wu Z H,Peng G L,et al.2021.Seismogenic fault and its rupture characteristics of the 21 May,2021 Yangbi M_S6.4 earthquake:Analysis results from the relocation of the earthquake sequence[J].Journal of Geomechanics,27(4):662-678.(in Chinese)
王未来,吴建平,房立华,等.2014.2014年云南鲁甸M_S6.5地震序列的双差定位[J].地球物理学报,57(9):3042-3051.
Wang W L,Wu J P,Fang L H,et al.2014.Double difference location of the Ludian M_S6.5 earthquake sequences in Yunnan province in 2014[J].Chinese Journal of Geophyiscs,57(9):3042-3051.(in Chinese)
王瑶,万永革.2021.多层介质中利用sPn与Pn到时差确定震源深度的研究[J].地震工程学报,43(6):1294-1302.
Wang Y,Wan Y G.2021.Determination of focal depth using the travel time difference of sPn and Pn waves in multilayer medium[J].China Earthquake Engineering Journal,43(6):1294-1302.(in Chinese)
闻学泽,杜方,易桂喜,等.2013.川滇交界东段昭通、莲峰断裂带的地震危险背景[J].地球物理学报,56(10):3361-3372.
Wen X Z,Du F,Yi G X.et al.2013.Earthquake potential of the Zhaotong and Lianfeng fault zones of the eastern Sichuan-Yunnan border region[J].Chinese Journal of Geophyiscs,56(10):3361-3372.(in Chinese)
向小龙,孙炜锋,李国伟,等.2015.云南盐津地区地质灾害发育特征及影响因素分析[J].地质力学学报,21(1):97-107.
Xiang X L,Sun W F,Li G W,et al.2015.Analysis on development characteristics and factors of geological disasters in Yanjin country,Yunnan Province[J].Journal of Geomechanics,21(1):97-107(in Chinese).
徐锡伟,江国焰,于贵华,等.2014.鲁甸6.5级地震发震断层判定及其构造属性讨论[J].地球物理学报,57(9):3060-3068.
Xu X W,Jiang G Y,Yu G H,et al.2014.Discussion on seismogenic fault of the Ludian M_S6.5 earthquake and its tectonic attribution[J].Chinese Journal of Geophyiscs,57(9):3060-3068.(in Chinese)
徐锡伟,闻学泽,郑荣章,等.2003.川滇地区活动块体最新构造变动样式及其动力来源[J].中国科学:地球科学,33(S1):151-162.
Xu X W,Wen X Z,Zheng R Z,et al.2003.Pattern of latest tectonic motion and its dynamics for active blocks in Sichuan Yunnan region,China[J].Science China Earth Sciences,33(S1):151-162.(in Chinese)
杨智娴,陈运泰,郑月军,等.2003.双差地震定位法在我国中西部地区地震精确定位中的应用[J].中国科学:地球科学,33(S1):129-134.
Yang Z X,Chen Y T,Zheng Y J,et al.2003.Accurate relocation of earthquakes in central-western China using the double-difference earthquake location algorithm[J].Science China Earth Sciences,33(S1):129-134.(in Chinese)
易桂喜,龙锋,梁明剑,等.2019.2019年6月17日四川长宁M_S6.0地震序列震源机制解与发震构造分析[J].地球物理学报,62(9):3432-3447.
Yi G X,Long F,Liang M J,et al.2019.Focal mechanism solutions and seismogenic structure of the 17 June 2019 M_S6.0 Sichuan Changning earthquake sequence[J].Chinese Journal of Geophyiscs,62(9):3432-3447.(in Chinese)
张建勇,王新,陈凌,等.2022.基于余震重定位和震源机制解研究青海玛多M_S7.4地震序列的发震构造和断裂形态[J].地球物理学报,65(2):552-562.
Zhang J Y,Wang X,Chen L,et al.2022.Seismotectonics and fault geometries of the Qinghai Maduo M_S7.4 earthquake sequence:Insight from aftershock relocations and focal mechanism solutions[J].Chinese Journal of Geophyiscs,65(2):552-562.(in Chinese)
张演,姜金钟,王光明,等.2024.云南盐津地区两种地震序列的地震活动性研究[J].地震研究,47(1):78-90.
Zhang Y,Jiang J Z,Wang G M,et al.2024.Analysis of the seismicity of two types of earthquake sequences in Yanjin,Yunnan[J].Journal of Seismological Research,47(1):78-90.(in Chinese)
张勇,许力生,陈运泰,等.2014.2014年8月3日云南鲁甸M_W6.1(M_S6.5)地震破裂过程[J].地球物理学报,57(9):3052-3059.
Zhang Y,Xu L S,Chen Y T,et al.2014.Rupture process of the 3 August 2014 Ludian,Yunnan,M_W6.1(M_S6.5)earthquake[J].Chinese Journal of Geophyiscs,57(9):3052-3059.(in Chinese)
郑勇,马宏生,吕坚,等.2009.汶川地震强余震(M_S≥5.6)的震源机制解及其与发震构造的关系[J].中国科学:地球科学,39(4):413-426.
Zheng Y,Ma H S,Lyu J,et al.2009.Source mechanism of strong aftershocks(M_S≥5.6)of the 2008/05/12 Wenchuan earthquake and the implication for seismotectonics[J].Science China Earth Sciences,39(4):413-426.(in Chinese)
周荣军,唐荣昌,钱洪,等.1997.地震构造类比法的应用——以川东地区华蓥山断裂带为例[J].地震研究,20(3):316-322.
Zhou R J,Tang R C,Qian H,et al.1997.An application of seismotectonic analogy to the Huayingshan fault zone in east Sichuan[J].Journal of Seismological Research,20(3):316-322.(in Chinese)
朱介涛,蔡学林,曹家敏,等.中国华南及东海地区岩石圈三维结构及演化[M].北京:地质出版社.
Zhu J T,Cai X L,Cao J M,et al.The three-dimensional structure of lithosphere and its evolution in South China and East China Sea[M].Beijing:Geological Publishing House.(in Chinese)
Crotwell H P,Owens T J,Ritsema J.1999.The TauP Toolkit:flexible seismic travel-time and ray-path utilities[J].Seismological Research Letters,70(2):154-160.
Hauksson E,Shearer P.2005.Southern California hypocenter relocation with waveform cross-correlation,Part 1:results using the Double-Difference Method[J].Bull Seismol Soc Am,95(3):896-903.
Jiang J Z,Li J,Fu H.2019.Seismicity analysis of the 2016 M_S5.0 Yunlong Earthquake,Yunnan,China and its tectonic implications[J].Pure Appl Geophys,176(3):1225-1241.
Long F,Wen X Z,Ruan X,et al.2015.A more accurate relocation of the 2013 M_S7.0 Lushan,Sichuan,China,earthquake sequence,and the seismogenic structure analysis[J].J Seismol,19(3):653-665.
Ma S T.2010.Focal depth determination for moderate and small earthquakes by modeling regional depth phases sPg,sPmP,and sPn[J].Bull Seismol Soc Am,100(3):1073-1088.
Rajkumar,Prajapati S K,Pal S K,et al.2022.Determination of focal depths of moderate earthquakes in Northeast Indian region using depth phase sPn[J].Nat Hazards,114:427-455
Saikia C K,Woods B B,Thio H K.2001.Calibration of the regional crustal waveguide and the retrieval of source parameters using waveform modeling[J].Pure Appl Geophys,158(7):1301-1338.
Tan Y,Zhu L,Helmberger D V,et al.2006.Locating and modeling regional earthquakes with two stations[J].J Geophys Res,111(B1):B01306.
Waldhauser F,Ellsworth W L.2000.A double-difference earthquake location algorithm:Method and application to the northern Hayward fault,California[J].Bull Seismol Soc Am,90(6):1353-1368.
Zhang M,Wen L X.2015.An effective method forsmall event detection:Match and locate(M&L)[J].Geophys J Int,200(3):1523-1537.
Zhao L S,Helmberger D V.1994.Source estimation from broadband regional seismograms[J].Bull Seismol Soc Am,84(1):91-104.
Zhao M,Long F,Yi G,et al.2021.Focal mechanism and seismogenic structure of the M_S5.1 Qingbaijiang Earthquake on February 3,2020,Southwestern China.Front Earth Sci,9:644142.
Zhu L P,Helmberger D V.1996.Advancement in source estimation techniques using broadband regional seismograms[J].Bull Seismol Soc Am,86(5):1634-1641.
Zhu L P,Rivera L A.2002.A note on the dynamic and static displacements from a point source in multilayered media[J].Geophys J Int,148(3):619-627.

备注/Memo

备注/Memo:

收稿日期:2023-09-07.
基金项目:中国地震局地震科技星火计划项目(XH212502Y); 云南省地震局科技专项(2021ZX04); 云南省地震局传帮带项目(CQ3-2021003); 中国地震局地震科技星火计划项目(XH21039Y); 云南省地震局“地震机理与孕震环境研究”创新团队.
第一作者简介:顾慧冬(1992-),硕士研究生在读,工程师,主要从事震源机制和破裂方向性等方面研究.E-mail:1574354495@qq.com.
通信作者简介:姜金钟(1987-),副研究员,博士,硕士生导师,主要从事地震学研究.E-mail:jz_jiang@foxmail.com.

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更新日期/Last Update: 2024-05-01