|本期目录/Table of Contents|

[1]王光明,彭关灵,赵小艳,等.基于地震序列时空分布特征分析维西—乔后断裂带地震危险性[J].地震研究,2021,44(03):367-379.
　WANG Guangming,PENG Guanling,ZHAO Xiaoyan,et al.Seismic Risk of the Weixi-Qiaohou Fault Zone Based on Temporal-spatial Distribution Characteristics of Earthquake Sequences[J].Journal of Seismological Research,2021,44(03):367-379.
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基于地震序列时空分布特征分析维西—乔后断裂带地震危险性(PDF/HTML)

《地震研究》[ISSN:1000-0666/CN:53-1062/P]

卷:
44
期数:
2021年03期
页码:
367-379
栏目:
出版日期:
2021-10-20

文章信息/Info

Title:
Seismic Risk of the Weixi-Qiaohou Fault Zone Based on Temporal-spatial Distribution Characteristics of Earthquake Sequences
作者:
王光明; 彭关灵; 赵小艳; 付 虹
(云南省地震局,云南 昆明 650224)
Author(s):
WANG Guangming; PENG Guanling; ZHAO Xiaoyan; FU Hong
(Yunnan Earthquake Agency,Kunming 650224,Yunnan,China)
关键词:
维西—乔后断裂;  漾濞MS6.4地震;  地震重定位;  余震衰减;  地震危险性
Keywords:
the Weixi-Qiaohou fault zone;  the Yangbi MS6.4 earthquake;  earthquake relocation;  attenuation of the aftershock sequence;  earthquake hazard
分类号:
P315.2
DOI:
-
摘要:
2013年以来,维西—乔后断裂带进入中强地震活跃期,2021年5月21日漾濞MS6.4地震发生前,已有3组MS≥5.0地震连续发生,表明该断裂带地震活动显著增强。采用双差定位方法对2013年以来发生在维西—乔后断裂带周边的4组地震序列进行重定位,并使用ZMAP软件包计算序列的b值和p值。结果显示,维西—乔后断裂带周边地震序列呈现出两组明显不同的时空分布特征,余震序列优势分布方向为NW向的3组地震序列衰减较快,序列b值相对较低,序列震中分布长宽比较大; 2016年云龙MS5.0地震序列优势分布方向为NE向,序列震中分布长宽比较小,衰减较慢,序列b值相对较高。基于序列类比结果和b值时间变化曲线分析认为,2021年漾濞MS6.4地震序列后续发生较大破坏性余震的可能性较小。综合2013年以来维西—乔后断裂带中强地震时空分布特征和区域地质构造资料分析认为,未来该地区MS≥5.0地震存在向东南或向北迁移的可能性。
Abstract:
Before the Yangbi MS6.4 earthquake on May 21,2021,three groups of MS≥5.0 earthquakes have occurred continuously,indicating that the seismic activity of the Weixi-Qiaohou fault zone has increased significantly since 2013.In this paper,we employ double-difference relocation algorithm to relocate earthquake sequences around the Weixi-Qiaohou fault zone since 2013,and use ZMAP to calculate the b-value and p-value of these sequences.The earthquake sequences around the Weixi-Qiaohou fault zone present obviously two different types of temporal-spatial distribution characteristics.Three earthquake sequences concentrate in a NW-trend band,which is parallel with the Weixi-Qiaohou fault,and the length-width ratios of the epicenter distribution of these earthquake sequences are larger.Furthermore,these three earthquake sequences decay faster and their b-values are relatively lower,while the Yunlong MS5.0 earthquake sequence in 2016 concentrates to a NE-trend band,and the length-width ratio of the epicenter distribution is relatively smaller.Also,the Yunlong MS5.0 earthquake sequence decays slower than the other three earthquake sequences,and its b-value is relatively higher.A contrastive analysis of earthquake sequences around the Weixi-Qiaohou fault zone shows that the possibility of large destructive aftershocks following the 2021 Yangbi MS6.4 earthquake sequence is small.Based on a comprehensive analysis of the spatial-temporal distribution characteristics of the moderately-strong earthquakes in the Weixi Qiaohou fault zone since 2013 and regional geological structure study,it is considered that MS≥5.0 earthquakes in this area may migrate to the Southeast(or the North)in the future.

参考文献/References:

安晓文,常祖峰,陈宇军,等.2018.云南第四纪活动断裂暨《云南第四纪活动断裂分布图》[M].北京:地震出版社,11-19.

常祖峰,常昊,李鉴林,等.2016b.维西—乔后断裂南段正断活动特征[J].地震研究,39(4):579-586.

常祖峰,常昊,臧阳,等.2016a.维西—乔后断裂新活动特征及其与红河断裂的关系[J].地质力学学报,22(3):517-530.

常祖峰,张艳凤,周青云,等.2014.2013年洱源MS5.5地震烈度分布及震区活动构造背景研究[J].中国地震,30(4):560-570.

崔效锋,谢富仁,张红艳.2006.川滇地区现代构造应力场分区及动力学意义[J].地震学报,28(5):451-461.

房立华,吴建平,苏金蓉,等.2018.四川九寨沟MS7.0地震主震及其余震序列精定位[J].科学通报,63(7):649-662.

冯建刚,张辉,杨萍.2016.2013年岷县漳县6.6级地震前地震b值异常特征研究[J].地震,36(1):32-37.

黄小龙,吴中海,蒋瑶,等.2015.2013年3月3日云南大理洱源MS5.5地震烈度分布及发震构造[J].地质通报,34(1):135-145.

阚荣举,张四昌,晏凤桐,等.1977.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,20(2):96-109.

李姣,姜金钟,杨晶琼.2020.2017年漾濞MS4.8和MS5.1地震序列的微震检测及重定位[J].地震学报,42(5):527-542.

罗睿洁,吴中海,黄小龙,等.2015.滇西北宾川地区主要活动断裂及其活动构造体系[J].地质通报,34(1):155-170.

毛玉平,韩新民,谷一山,等.2003.云南地区强震(M≥6)研究[M].昆明:云南科技出版社.

潘睿,姜金钟,付虹,等.2019.2017年云南漾濞MS5.1及MS4.8地震震源机制解和震源深度测定[J].地震研究,42(3):338-348.

曲均浩,蒋海昆.2012.余震活动机理研究综述[J].中国地震,28(2):109-120.

任俊杰,张世民,侯治华,等.2007.滇西北通甸-巍山断裂中段的晚第四纪滑动速率[J].地震地质,29(4):756-764.

史海霞,孟令媛,张雪梅,等.2018.汶川地震前的b值变化[J].地球物理学报,61(5):1874-188.

谭毅培,曹井泉,陈继锋,等.2015.2013年甘肃岷县漳县MS6.6地震余震序列时域衰减特征分析[J].地球物理学报,58(9):3222-3231.

王光明,刘自凤,赵小艳,等.2018.2018年云南通海MS5.0地震序列重定位及发震构造讨论[J].地震研究,41(4):503-510.

王光明,吴中海,彭关灵,等.2021.2021年5月21日漾濞MS6.4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.

吴中海,赵希涛,范桃园,等.2012.泛亚铁路滇西大理至瑞丽沿线主要活动断裂与地震地质特征[J].地质通报,31(2):191-217.

杨军,苏有锦,李孝宾,等.2015.2013年洱源MS5.5地震序列ML≥3.4地震的震源机制解研究[J].地震研究,38(2):196-202.

易桂喜,龙锋,梁明剑,等.2019.2019年6月17日四川长宁MS6.0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.

易桂喜,闻学泽,辛华,等.2013.龙门山断裂带南段应力状态与强震危险性研究[J].地球物理学报,56(4):1112-1120.

张致伟,龙峰,王世元,等.2019.四川宜宾地区地震定位及速度结构[J].地震地质,41(4):913-925.

赵小艳,付虹.2014.2013年洱源MS5.5和MS5.0地震发震构造识别[J].地震学报,36(4):640-650.

周仕勇,许忠淮.1999.地震序列研究综述[J].中国地震,15(3):268-277.

Fang L H,Wu J P,Liu J,et al.2015b.Preliminary report on the 22 November 2014 MW6.1/MS6.3 Kangding earthquake,Western Sichuan,China[J].Seismol Res Lett,86(6):1603-1613.

Fang L H,Wu J P,Wang W L,et al,2015a.Aftershock observation and analysis of the 2013 MS7.0 Lushan Earthquake[J].Seismol Res Lett,86(4):1135-1142.

Gulia L,Wiemer S.2019.Real-time discrimination of earthquake foreshocks and aftershocks[J].Nature,574(7777):193-120.

Gutenberg B,Richter C F.1944.Frequency of earthquake in California[J].Bulletin of the Seismological Society of America,34(4):185-188.

Jiang J Z,Li J,Fu H.2019.Seismicity analysis of the 2016 MS5.0 Yunlong earthquake,Yunnan,China and its tectonic implications[J].Pure Appl Geophys.,176(3):1225-1241.

Nanjo K Z.2020.Were changes in stress state responsible for 2019 Ridgecrest,California,earthquakes?[J].Nature Communications,11(1):3082.

Scholz C H.1968.The frequency-magnitude relation of microfracturing in rock and its relation to earthquakes[J].Bulletin of the Seismological Society of America,58(1):399-415.

Schorlemmer D,Wiemer S,Wyss M.2005.Variations in earthquake-size distribution across different stress regimes[J].Nature,437(22):539-542.

Utsu T,Ogata Y,Matsuura R S.1995.The centenary of the Omori formula for a decay law of aftershock activity[J].Phys Earth,43(1):1-33.

Utsu T.1961.A statistical study on the occurrence of aftershocks[J].Geophys Mag,30:521-605.

Waldhauser F,Ellsworth W L.2000.A double-difference earthquake algorithm:method and application to northern Hayward fault,California[J].Bulletin of the Seismological Society of America,99(6):1353-1368.

Waldhauser F,Schaff D P.2008.Large-scale relocation of two decades of Northern California seismicity using cross-correlation and double-difference methods[J].J Geophys Res,113(B8):B08311.

Wang E,Burchfiel B C,Royden L H,et al.1998.The Cenozoic Xianshuihe-Xiaojiang,Red River,and Dali Fault Systems of southwestern Sichuan and central Yunnan,China[J].Geological Society of America,327:1-108.

Wang Q D,Chu R S,Yang H,et al.2018.Complex rupture of the 2014 MS6.6 Jinggu earthquake sequence in Yunnan Province inferred from double-difference relocation[J].Pure Appl Geophys,175(4):4253-4274.

Wessel P,Luis J F,Uieda L,et al.2019.The generic mapping tools version 6[J].Geochemistry,Geophysics,Geosystem,20(11):5556-5564.

Wiemer S,Wyss M.1994.Seismic quiescence before the Landers(M=7.5)and Big Bare(M=6.5)1992 earthquakes[J].Bulletin of Seismological Society of America,84(3):900-916.

Wu Z H,Zhang Y S,Hu D G,et al.2009.Late Quaternary normal faulting and its kinematic mechanism of eastern piedmont fault of the Haba-Yulong Snow Mountains in northwestern Yunnan,China[J].Sci China Ser D-Earth Sci,52(10):1470-1484.

备注/Memo

备注/Memo:
收稿日期:2021-07-19
基金项目:云南省地震局自立科研项目——漾濞地震专项(2021YBZX03)、地震科技星火计划项目(XH20054Y)、国家自然科学基金——云南联合基金重点项目(U2002211)及云南省地震局“地震机理与孕震环境研究”创新团队联合资助.

更新日期/Last Update: 2021-10-20