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2022年四川芦山M_(S)6.1地震前应力状态研究
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作者 张致伟 曾宪伟 +4 位作者 王迪 路茜 王玮铭 杨鹏 龙锋 《地震研究》 CSCD 北大核心 2024年第4期483-492,共10页
为研究2022年6月1日四川芦山M_(S)6.1地震的孕育和发生过程,采用CAP方法反演了2013年芦山M_(S)7.0主震及M_(S)≥5.0余震的震源机制解,并基于应力张量方差与b值时空分布特征,探讨了芦山M_(S)6.1地震的力学机制和震源区的应力状态。结果表... 为研究2022年6月1日四川芦山M_(S)6.1地震的孕育和发生过程,采用CAP方法反演了2013年芦山M_(S)7.0主震及M_(S)≥5.0余震的震源机制解,并基于应力张量方差与b值时空分布特征,探讨了芦山M_(S)6.1地震的力学机制和震源区的应力状态。结果表明:2022年芦山M_(S)6.1地震震源机制表现出与2013年芦山M_(S)7.0主震和5级余震相似的逆冲型破裂特征,压应力轴方位与龙门山断裂带南段区域应力场一致。2013年芦山M_(S)7.0地震后震中及附近的应力张量方差和b值长期处于低值状态,2022年芦山M_(S)6.1地震前震中及附近出现了应力张量方差和b值的低值异常,表明芦山余震区处于较高的应力水平。分析认为:巴颜喀拉块体持续东向运动受到华南块体的阻挡,震中所在区域长期受挤压逆冲作用,从而使芦山余震区长期处于应力积累的状态,芦山M_(S)6.1地震也是在这种动力学背景下发生的。 展开更多
关键词 芦山M_(S)6.1地震 芦山M_(S)7.0地震 震源机制解 应力张量方差 B值 应力状态
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Moment magnitudes of two large Turkish earthquakes on February 6,2023 from long-period coda 被引量:7
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作者 Xinyu Jiang Xiaodong Song +1 位作者 Tian Li Kaixin Wu 《Earthquake Science》 2023年第2期169-174,共6页
Two large earthquakes(an earthquake doublet)occurred in south-central Turkey on February 6,2023,causing massive damages and casualties.The magnitudes and the relative sizes of the two mainshocks are essential informat... Two large earthquakes(an earthquake doublet)occurred in south-central Turkey on February 6,2023,causing massive damages and casualties.The magnitudes and the relative sizes of the two mainshocks are essential information for scientific research and public awareness.There are obvious discrepancies among the results that have been reported so far,which may be revised and updated later.Here we applied a novel and reliable long-period coda moment magnitude method to the two large earthquakes.The moment magnitudes(with one standard error)are 7.95±0.013 and 7.86±0.012,respectively,which are larger than all the previous reports.The first mainshock,which matches the largest recorded earthquakes in the Turkish history,is slightly larger than the second one by 0.11±0.035 in magnitude or by 0.04 to 0.18 at 95%confidence level. 展开更多
关键词 2023 Turkish earthquakes coda wave moment magnitude long-period
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“6.1”芦山地震作用下宝兴新华村滑坡动力响应与失稳过程离散元模拟
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作者 周赞 罗永红 +2 位作者 南凯 李均益 马潇 《地质科技通报》 CAS CSCD 北大核心 2024年第2期226-237,共12页
斜坡浅表层是各类地震地质灾害发育的潜在破坏位置,坡面形态和坡体结构往往造成斜坡动力响应及破坏的复杂化。为探究不稳定斜坡浅表潜在滑动层动力响应特征与失稳过程,以芦山M_(s)6.1级地震触发的新华村滑坡为例,基于现场调查采用离散... 斜坡浅表层是各类地震地质灾害发育的潜在破坏位置,坡面形态和坡体结构往往造成斜坡动力响应及破坏的复杂化。为探究不稳定斜坡浅表潜在滑动层动力响应特征与失稳过程,以芦山M_(s)6.1级地震触发的新华村滑坡为例,基于现场调查采用离散元方法建立了二维计算模型,分析了该斜坡潜在滑动层及坡面形态的动力响应特征并对其失稳过程进行了模拟。结果表明:(1)斜坡浅表潜在滑动层具有强烈动力放大效应;(2)微地貌对于潜在不稳定斜坡坡面的放大效应具有明显的影响,浅表潜在滑动层水平向及竖直向加速度在凸出部位的放大效应显著,凹陷部位相较于凸出部位放大效应较低;(3)研究揭示新华村滑坡在微地貌的作用下凸起地形呈现先于凹陷地形遭受破坏,其失稳过程分为震动放大局部震裂-凸出地形破坏-凹陷地形破坏-完全破坏整体下滑-重力堆积5个阶段。该研究结果有助于提升防灾人员对地震诱发潜在不稳定斜坡失稳的认识,为防灾减灾提供理论和数据支撑。 展开更多
关键词 芦山M_(s)6.1级地震 地震滑坡 动力响应 变形破坏模型 二维离散元模拟 新华村滑坡
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Earthquake Magnitude Probability and Gamma Distribution
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作者 Min-Hao Wu Jui-Pin Wang Chia-Ying Sung 《International Journal of Geosciences》 2023年第7期585-602,共18页
The earthquake magnitude probability distribution is one of the underlying input data for certain earthquake analyses, such as probabilistic seismic hazard analysis. Nowadays, the method proposed by McGuire and Arabas... The earthquake magnitude probability distribution is one of the underlying input data for certain earthquake analyses, such as probabilistic seismic hazard analysis. Nowadays, the method proposed by McGuire and Arabasz (1990) is commonly used for obtaining the (simulated) earthquake magnitude probability distributions. However, based on the observed earthquake data in 5 regions (Taiwan, Japan, California, Turkey, and Greece), the model did not fit the observation well. Instead, all of the case studies show that using the newly proposed gamma distribution can improve the simulation significantly compared to the conventional method. 展开更多
关键词 earthquake magnitude Probability Distribution Gamma Distribution
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The Collaboratory for the Study of Earthquake Predictability in China:Experiment Design and Preliminary Results of CSEP2.0
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作者 ZHANG Shengfeng ZHANG Yongxian +3 位作者 Maximilian J.WERNER Kenny G.RAHAM David A.RHOADES JoséA.BAYONA 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2024年第S01期94-97,共4页
Since the inaugural international collaboration under the framework of the Collaboratory for the Study of Earthquake Predictability(CSEP)in 2007,numerous forecast models have been developed and operated for earthquake... Since the inaugural international collaboration under the framework of the Collaboratory for the Study of Earthquake Predictability(CSEP)in 2007,numerous forecast models have been developed and operated for earthquake forecasting experiments across CSEP testing centers(Schorlemmer et al.,2018).Over more than a decade,efforts to compare forecasts with observed earthquakes using numerous statistical test methods and insights into earthquake predictability,which have become a highlight of the CSEP platform. 展开更多
关键词 earthquake forecasting seismicity modeling CSEP2.0 Pattern Informatics(PI)algorithm long-to-intermediate-term forecast Relative Intensity(RI)algorithm Completeness magnitude S test N test
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Earthquake probabilities and magnitude distribution (M ≥ 6.7) along the Haiyuan fault, northwestern China 被引量:8
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作者 冉洪流 《地震学报》 CSCD 北大核心 2004年第6期609-615,共7页
In recent years, some researchers have studied the paleoearthquake along the Haiyuan fault and revealed a lot of paleoearthquake events. All available information allows more reliable analysis of earthquake recurrence... In recent years, some researchers have studied the paleoearthquake along the Haiyuan fault and revealed a lot of paleoearthquake events. All available information allows more reliable analysis of earthquake recurrence interval and earthquake rupture patterns along the Haiyuan fault. Based on this paleoseismological information, the recur- rence probability and magnitude distribution for M≥6.7 earthquakes in future 100 years along the Haiyuan fault can be obtained through weighted computation by using Poisson and Brownian passage time models and consid- ering different rupture patterns. The result shows that the recurrence probability of MS≥6.7 earthquakes is about 0.035 in future 100 years along the Haiyuan fault. 展开更多
关键词 活动断裂 古地震 强震复发 震级分布
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2022年6月1日四川芦山M_(S)6.1地震的发震构造与力学机制探讨 被引量:3
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作者 张致伟 龙锋 +6 位作者 石富强 路茜 杨宜海 杨星 王迪 祁玉萍 杨鹏 《地球物理学报》 SCIE EI CAS CSCD 北大核心 2023年第10期4095-4110,共16页
2022年6月1日17时00分08秒(北京时间)四川雅安市芦山县发生M_(S)6.1地震,此次地震是继2008年汶川M_(S)8.0、2013年芦山M_(S)7.0地震后发生在龙门山断裂带的又一显著地震,与后者在空间上仅相距9 km.为揭示此次地震的发震构造特征及其与2... 2022年6月1日17时00分08秒(北京时间)四川雅安市芦山县发生M_(S)6.1地震,此次地震是继2008年汶川M_(S)8.0、2013年芦山M_(S)7.0地震后发生在龙门山断裂带的又一显著地震,与后者在空间上仅相距9 km.为揭示此次地震的发震构造特征及其与2013年芦山M_(S)7.0地震的关系,进而理解龙门山断裂带强震孕育动力学过程与地震危险性,本文采用CAP全波形反演方法计算了芦山M_(S)6.1地震的震源机制解,利用多阶段定位法对2013年芦山M_(S)7.0地震以来余震区地震进行了精确定位,并基于库仑应力讨论两次地震的应力触发关系.结果显示,芦山M_(S)6.1地震的震源机制解为:节面Ⅰ的走向、倾角和滑动角分别为221°、40°和105°;节面Ⅱ的参数为22°、52°和78°,矩心深度14 km,震源机制断层面解呈现一组与龙门山断裂带性质接近的节面.反演给出的P轴方位角为120°,倾角为6°,反映了此次地震主要受NWW-SEE向水平挤压应力作用,与龙门山断裂带南段背景构造应力场一致.地震精定位结果显示芦山M_(S)6.1地震序列发生在2013年芦山M_(S)7.0地震发震断层北西侧的一条倾向南东的反冲断层上,据此可判断震源机制解的节面Ⅱ为发震断层面.在此基础上,通过指定发震与接收断层,计算获得2013年芦山M_(S)7.0地震对此次M_(S)6.1地震所在断层的最大库仑应力加载值可达1.5 MPa,说明前者对后者有显著的触发作用. 展开更多
关键词 芦山M_(S)6.1地震 地震定位 震源机制 库仑应力 发震构造
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2022年6月1日四川芦山M_(S)6.1地震的震源参数及其构造启示 被引量:4
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作者 许英才 郭祥云 《地球物理学报》 SCIE EI CAS CSCD 北大核心 2023年第8期3202-3217,共16页
2022年6月1日四川芦山发生M_(S)6.1地震.基于四川区域台网的地震资料,采用HypoDD(双差重定位)方法对芦山M_(S)6.1地震序列ML≥1.0的地震事件(2022年6月1日至7日)进行了重定位,利用gCAP(generalized Cut And Paste)波形反演方法获取了序... 2022年6月1日四川芦山发生M_(S)6.1地震.基于四川区域台网的地震资料,采用HypoDD(双差重定位)方法对芦山M_(S)6.1地震序列ML≥1.0的地震事件(2022年6月1日至7日)进行了重定位,利用gCAP(generalized Cut And Paste)波形反演方法获取了序列中M_(S)≥3.0地震的震源机制和矩心深度,同时用Bootstrap方法评估了主震震源机制结果的稳定性以及计算了不同机构得到的多个震源机制中心解的最小旋转角,计算了现今区域应力场体系在2022年芦山M_(S)6.1地震和2013年芦山M_(S)7.0地震震源机制节面产生的相对剪应力和正应力,并根据芦山M_(S)6.1地震序列重定位后的震源位置拟合了发震断层面,分析了该地震序列的发震构造.获得的主要结果如下:(1)芦山M_(S)6.1地震序列主要沿着双石—大川断裂呈现NE-SW向的优势展布,初始破裂深度主要集中在10~18 km,平均深度14.5 km,整体呈现西北浅、东南深的空间分布特征.芦山M_(S)6.1主震和M_(S)4.5余震均位于余震区东南端,序列中其余的地震大都位于主震的西北侧,呈现为单侧破裂的特征,发震断层面倾向为SE向.(2)Bootstrap方法估算的误差以及多个震源机制中心解的最小空间旋转角均显示gCAP反演得到的主震震源机制误差较小,结果较为稳定可靠,芦山M_(S)6.1主震震源机制解为节面Ⅰ:走向228°、倾角46°、滑动角106°;节面Ⅱ:走向26°、倾角46°、滑动角74°,矩心深度12 km,矩震级MW5.8,M_(S)≥3.0余震的震源机制为逆冲型,震源矩心深度介于11~13 km.P轴方位主要为NW-SE向,与区域构造应力场的方向基本一致.(3)震源机制与应力场关系模拟结果表明2022年芦山M_(S)6.1地震和2013年芦山M_(S)7.0地震发震断层面的形状均处于相对剪应力和正应力的抑制节面,且不利于应力的充分释放.结合已有地质构造和以上分析结果,认为2022年芦山M_(S)6.1地震震源机制的节面Ⅱ为该地震断层面,发震构造极有可能为走向NE且倾向SE的隐伏逆冲断层,可能和2013年芦山M_(S)7.0地震走向NE、倾向NW发震构造上的次级反冲断层有关,这与2013年芦山M_(S)7.0地震发震构造倾向NW的断层方向有所不同. 展开更多
关键词 芦山M_(S)6.1地震 双差重定位 震源机制 滑动特性 发震构造
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四川地区场地放大系数特征分析及在强地震动模拟中的应用——以2022年芦山M_(S)6.1地震为例 被引量:1
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作者 傅磊 谢俊举 +3 位作者 陈苏 张斌 张旭 李小军 《地球物理学报》 SCIE EI CAS CSCD 北大核心 2023年第7期2933-2950,共18页
基于四川地区62个强震动台站的场地资料,依据中国抗震规范及美国下一代衰减的Geomatrix(GMX)场地分类方法将台站场地进行了划分,并以台站的场地放大系数和高频衰减参数(κ0)为基础数据,研究了不同场地类型的场地放大系数平均特征.结果显... 基于四川地区62个强震动台站的场地资料,依据中国抗震规范及美国下一代衰减的Geomatrix(GMX)场地分类方法将台站场地进行了划分,并以台站的场地放大系数和高频衰减参数(κ0)为基础数据,研究了不同场地类型的场地放大系数平均特征.结果显示,在中国Ⅱ类场地中,受狭窄山间谷底地形效应影响,满足GMX的C类场地在大于10 Hz的高频段有明显放大;受深厚软弱沉积层影响,满足GMX的D类场地在小于5 Hz的低频段放大效应显著.考虑震源滑动模型、山区和盆地品质因子差异、局部场地效应,采用区域内余震平均应力降,通过随机有限断层法模拟了2022年芦山M_(S)6.1地震中9个断层距(Rrup)<100 km的强震动台站的加速度时程、傅里叶振幅谱(FAS)和反应谱(PSA).结果显示,模拟结果与观测加速度时程的S波部分符合良好.在8 s以下周期范围内模拟与观测FAS和PSA形状和幅值基本一致.较好地模拟结果支持此次地震为2013年芦山M_(S)7.0芦山地震的一次余震.另外,模拟结果体现了此次地震在Rrup<35 km范围内有明显的方向性效应,与观测数据相符.最后,考虑各类场地的场地放大系数和κ0的平均特性,比较了此次地震中Rrup<150 km的167个盆地和130个山区烈度台观测和模拟峰值加速度(PGA)和峰值速度(PGV),以及周期为0.5 s、1.0 s、5.0 s和8.0 s的PSA幅值随断层距的衰减特性.结果显示,山区和盆地的地震动参数随距离的衰减特性较为相似,山区和盆地的PGA、PGV强度相当.但是,在周期大于1.0 s的长周期段,盆地的反应谱幅值整体上大于山区. 展开更多
关键词 芦山M_(S)6.1地震 场地效应 强地震动 随机有限断层法 方向性效应
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Earthquake probabilities and magnitude distribution (M≥6.7) along the Haiyuan fault, northwestern China 被引量:5
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作者 RAN Hong-liu(冉洪流) 《Acta Seismologica Sinica(English Edition)》 CSCD 2004年第6期671-677,共8页
In recent years, some researchers have studied the paleoearthquake along the Haiyuan fault and revealed a lot of paleoearthquake events. All available information allows more reliable analysis of earthquake recurrenc... In recent years, some researchers have studied the paleoearthquake along the Haiyuan fault and revealed a lot of paleoearthquake events. All available information allows more reliable analysis of earthquake recurrence interval and earthquake rupture patterns along the Haiyuan fault. Based on this paleoseismological information, the recur- rence probability and magnitude distribution for M≥6.7 earthquakes in future 100 years along the Haiyuan fault can be obtained through weighted computation by using Poisson and Brownian passage time models and consid- ering different rupture patterns. The result shows that the recurrence probability of MS≥6.7 earthquakes is about 0.035 in future 100 years along the Haiyuan fault. 展开更多
关键词 active fault PALEOearthquake strong earthquake recurrence magnitude distribution
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芦山Ms6.1级地震山地灾害异常区灾害成生机制 被引量:2
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作者 吴昊宸 王运生 +3 位作者 罗永红 刘世成 唐涛 冯卓 《成都理工大学学报(自然科学版)》 CAS CSCD 北大核心 2023年第1期111-121,共11页
探讨2022年6月1日四川省芦山Ms 6.1级地震次生灾害的发育特点及不同活动性断层地震次生灾害的发育规律。通过地表调查并借助无人机、机载雷达等手段对次生地质灾害集中发育区进行实地调查,发现灾害异常区位于宝兴县东河两岸,表现为大量... 探讨2022年6月1日四川省芦山Ms 6.1级地震次生灾害的发育特点及不同活动性断层地震次生灾害的发育规律。通过地表调查并借助无人机、机载雷达等手段对次生地质灾害集中发育区进行实地调查,发现灾害异常区位于宝兴县东河两岸,表现为大量崩塌及少部分滑坡,灾害分布呈短椭圆形,以高位崩塌为主,滑坡发育于斜坡上部的残坡积发育部位。由于背坡效应和斜坡结构的耦合作用,致使此次地震造成的次生灾害集中发育在宝兴县东河一带。 展开更多
关键词 芦山6.1级地震 山地灾害异常区 斜坡动力响应 灾害发育机制
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新疆地区电磁预测指标体系在2023年1月30日沙雅M_(S)6.1地震中的应用 被引量:2
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作者 艾萨·伊斯马伊力 翟世龙 +3 位作者 张桉赫 冯丽丽 贺曼秋 冯志生 《内陆地震》 2023年第3期272-280,共9页
2023年1月30日新疆沙雅县(82.29°E,40.01°N)发生M_(S)6.1地震,震源深度50 km。地震发生前,中国局地震短临预报跟踪电磁学科组和新疆地震局电磁学科组依据中国地震局《地震电磁分析预测技术方法工作手册》、《新疆地区地震分... 2023年1月30日新疆沙雅县(82.29°E,40.01°N)发生M_(S)6.1地震,震源深度50 km。地震发生前,中国局地震短临预报跟踪电磁学科组和新疆地震局电磁学科组依据中国地震局《地震电磁分析预测技术方法工作手册》、《新疆地区地震分析预测技术方法工作手册》和《地震电磁分析预报方法清单》对新疆地区电磁台站的数据进行异常梳理,发现新疆地区电磁台站存在流动地磁、地磁垂直强度极化、地磁逐日比、地磁低点位移等多项异常。震前异常综合预测意见与实发地震基本一致,震前中短期渐进式异常演化特征较突出,2017—2020年新疆地区地震电磁学科预测指标体系建设工作已初见成效。 展开更多
关键词 沙雅M_(S)6.1地震 电磁异常 异常指标 地震预报
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Study on Variation of Fitting Goodness of Relation Between Earthquake Frequency and Magnitude before Moderately Strong Earthquakes (Ms≥5.0) 被引量:1
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作者 Li Zhixiong,Zhang Guomin,Fu Zhengxiang,and Zhang YongxianState Seismological Bureau,Beijing 100036,China Center for Analysis and Prediction,SSB,Beijing 100036,China 《Earthquake Research in China》 1996年第4期20-28,共9页
In this paper,characteristics of spatial and temporal variation of linear fitting goodness before some moderately strong earthquakes(Ms≥5.0)in the eastern part of China(east of longitude 180)are studied according to ... In this paper,characteristics of spatial and temporal variation of linear fitting goodness before some moderately strong earthquakes(Ms≥5.0)in the eastern part of China(east of longitude 180)are studied according to the famous Gutenberg-Richter’s relation expressed as lgN=a-bM,by using the moderate and small events that occurred in and around the source area.The results show that the linear goodness of fitting varies abnormally prior to these moderately strong earthquakes.In the early stage of the earthquake preparatory process,distribution of the energy released through small events in and around the source area is isostatic and the fitting goodness approximates 1,while the distribution of the energy turns to be isostatic before moderately strong earthquakes,leading to the obvious decrease of the linear goodness of fitting.This phenomenon could be a medium term anomaly and a medium term criterion for moderately strong earthquake prediction. 展开更多
关键词 RELATION BETWEEN earthquake frequency and magnitude Linear GOODNESS of fitting Medium TERM criterion for moderately strong earthquakeS
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Continuous-cyclic variations in the b-value of the earthquake frequency-magnitude distribution 被引量:3
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作者 Z.H.El-Isa 《Earthquake Science》 2013年第5期301-320,共20页
Seismicity of the Earth (M ≥ 4.5) was compiled from NEIC, IRIS and ISC catalogues and used to compute b-value based on various time windows. It is found that continuous cyclic b-variations occur on both long and sh... Seismicity of the Earth (M ≥ 4.5) was compiled from NEIC, IRIS and ISC catalogues and used to compute b-value based on various time windows. It is found that continuous cyclic b-variations occur on both long and short time scales, the latter being of much higher value and sometimes in excess of 0.7 of the absolute b-value. These variations occur not only yearly or monthly, but also daily. Before the occurrence of large earthquakes, b-values start increasing with variable gradients that are affected by foreshocks. In some cases, the gradient is reduced to zero or to a negative value a few days before the earthquake occurrence. In general, calculated b-values attain maxima 1 day before large earthquakes and minima soon after their occurrence. Both linear regression and maximum likelihood methods give correlatable, but variable results. It is found that an expanding time window technique from a fixed starting point is more effective in the study of b-variations. The calculated b-variations for the whole Earth, its hemispheres, quadrants and the epicentral regions of some large earthquakes are of both local and regional character, which may indicate that in such cases, the geodynamic processes acting within a certain region have a much regional effect within the Earth. The b-variations have long been known to vary with a number of local and regional factors including tectonic stresses. The results reported here indicate that geotectonic stress remains the most significant factor that controls b-variations. It is found that for earthquakes with Mw ≥ 7, an increase of about 0.20 in the b-value implies a stress increase that will result in an earthquake with a magnitude one unit higher. 展开更多
关键词 earthquake frequency-magnitude B-VALUE Temporal b-variation Spatial b-variation
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Complex Seismic Focus Structure and Earthquake-Triggered Landslide Distribution:Analysis of the 2014 Ludian M_w6.1 Earthquake in Yunnan 被引量:3
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作者 CHEN Xiaoli LIU Chunguo 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2017年第2期733-734,共2页
Objective The 2014 Ludian Mw6.1 earthquake in Yunnan occurred in a mountainous area with complex tectonics and topography, which caused serious damage as well as co-seismic landslides of an unusual large scale. Becau... Objective The 2014 Ludian Mw6.1 earthquake in Yunnan occurred in a mountainous area with complex tectonics and topography, which caused serious damage as well as co-seismic landslides of an unusual large scale. Because the suspected seismogenic faults on the surface, distribution of aftershocks and focal mechanism solutions are not consistent, it remains difficult to determine what is the real causal fault or seismogenic structure for this event. Actually, it may imply the complicity of the seismic source at depth. In addition, the distribution of the co- seismic landslides also exhibits some diffusion that is different from general eases, likely associated with the seismic focus structure. 展开更多
关键词 Complex Seismic Focus Structure and earthquake-Triggered Landslide Distribution:Analysis of the 2014 Ludian M_w6.1 earthquake in Yunnan
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芦山M_(S)6.1级地震石棉县城谷坡动力响应特征 被引量:1
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作者 冯卓 王运生 +2 位作者 吴昊宸 唐涛 刘世成 《山地学报》 CSCD 北大核心 2023年第1期93-102,共10页
在揭示山体不同部位和不同场地条件对斜坡地震动响应程度的研究中,学者们多采用振动台和建模等方法,较少使用天然地震下记录到的地震波数据进行研究分析。本研究以2022年芦山M_(S) 6.1级地震为对象,分析了布置于石棉县的强震监测仪所记... 在揭示山体不同部位和不同场地条件对斜坡地震动响应程度的研究中,学者们多采用振动台和建模等方法,较少使用天然地震下记录到的地震波数据进行研究分析。本研究以2022年芦山M_(S) 6.1级地震为对象,分析了布置于石棉县的强震监测仪所记录到的主震数据,采用小波变换方法分析了山体部位、高程、场地条件等因素对斜坡地震动力响应峰值加速度和Arisa强度的影响,明确了地震时频演变规律。研究结果表明:(1)坡折处水平向放大效应更加明显;(2)南桠河左岸坡体卓越频率为6~10 Hz,右岸为5~12 Hz;(3)深厚风化层场地相较于基岩场地具有更显著的放大效应;(4)S波到达地面时会分异成不同频值,其主频值分别为8.50 Hz和4.20 Hz附近。研究结果可为地震区类似斜坡变形破坏模式和稳定性研究提供参考。 展开更多
关键词 芦山M_(S)6.1级地震 石棉县城谷坡 实测地震数据 地震动响应 放大效应
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Application of scaling-rule theory in crustal rock fracture to studying characteristics of seismological precursors associated with M=6.1 Shandan-Minle earthquake
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作者 荣代潞 李亚荣 韩晓明 《Acta Seismologica Sinica(English Edition)》 EI CSCD 2006年第4期472-482,共11页
In the paper, we introduce Allegre's scaling-rule theory of rock fracture and the probability to develop a method for predicting earthquake occurrence time on its basis. As an example, we study the characteristics of... In the paper, we introduce Allegre's scaling-rule theory of rock fracture and the probability to develop a method for predicting earthquake occurrence time on its basis. As an example, we study the characteristics of seismological precursors (seismic spatial correlation length and coda Qc) associated with the earthquake (M=6.1) occurred in Shandan-Minle, Gansu Province. The results show an increasing trend of seismic spatial correlation length and coda Qc before the earthquake. And a power exponent relation is used to fit the increasing variation form of these two parameters. The study has provided a basis for creating a method and finding indexes to predict the earthquake occurrence time by using the monitored seismic spatial correlation length and coda Qc. 展开更多
关键词 earthquake time prediction M=6.1 Shandan-Minle earthquake coda Qc correlation length
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Research on characteristics of magnitude structure of earthquake sequences
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作者 孙佩卿 李钦祖 +1 位作者 戴英华 赵军 《Acta Seismologica Sinica(English Edition)》 EI CSCD 1998年第1期41-46,共6页
Based on the research on 108 strictly selected earthquake sequences since 1965 in the Chinese mainland, why the magnitude structures of most of these sequences are not in accord with the G R relation has been analyze... Based on the research on 108 strictly selected earthquake sequences since 1965 in the Chinese mainland, why the magnitude structures of most of these sequences are not in accord with the G R relation has been analyzed and the fitting method with the division of the magnitude structure for the earthquake sequences has been suggested. The characteristic values of this method in the high magnitude interval have mainly been researched, and characteristic magnitude percent f and the slope ratio b 2 of the high magnitude interval, which are different for various sequence types are most obvious. The results show that the N M patterns of magnitude structures for 52.8% earthquake sequences are not in accord with the G R relation from the magnitude less than 80% of the maximum one and that for only 18.5% earthquake sequences show the decrease trend in the high magnitude interval. When b 2 <0 or 0 b 2 <3.0 and f is less, the strong aftershocks in the earthquake sequences are less; when b 2 3.0 for the sequence, several strong aftershocks often occurred; when 0b 2<3.0 and f is bigger, aftershocks with middle magnitude are more in these sequences. 展开更多
关键词 earthquake sequence magnitude magnitude characteristic
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Comparison between different earthquake magnitudes determined by China Seismo-graph Network
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作者 刘瑞丰 陈运泰 +5 位作者 任枭 徐志国 孙丽 杨辉 梁建宏 任克新 《Acta Seismologica Sinica(English Edition)》 CSCD 2007年第5期497-506,共10页
By linear regression and orthogonal regression methods, comparisons are made between different magnitudes (local magnitude ML, surface wave magnitudes Ms and MsT, long-period body wave magnitude mB and short-period b... By linear regression and orthogonal regression methods, comparisons are made between different magnitudes (local magnitude ML, surface wave magnitudes Ms and MsT, long-period body wave magnitude mB and short-period body wave magnitude mb) determined by Institute of Geophysics, China Earthquake Administration, on the basis of observation data collected by China Seismograph Network between 1983 and 2004. Empirical relations between different magnitudes have been obtained. The result shows that: ① As different magnitude scales reflect radiated energy by seismic waves within different periods, earthquake magnitudes can be described more objectively by using different scales for earthquakes of different magnitudes. When the epicentral distance is less than 1000 km, local magnitude ME can be a preferable scale; In case M〈4.5, there is little difference between the magnitude scales; In case 4.5〈M〈6.0, mB〉Ms, i.e., Ms underestimates magnitudes of such events, therefore, mB can be a better choice; In case M〉6.0, Ms〉mB〉mb, both mB and mb underestimate the magnitudes, so Ms is a preferable scale for determining magnitudes of such events (6.0〈M〈8.5); In case M〉8.5, a saturation phenomenon appears in Ms, which cannot give an accurate reflection of the magnitudes of such large events; ② In China, when the epicentral distance is less than 1 000 km, there is almost no difference between ME and Ms, and thus there is no need to convert between the two magnitudes in practice; ③ Although Ms and Ms7 are both surface wave magnitudes, Ms is in general greater than Ms7 by 0.2~0.3 magnitude, because different instruments and calculation formulae are used; ④ mB is almost equal to mb for earthquakes around mB4.0, but mB is larger than mb for those of mB〉4.5, because the periods of seismic waves used for measuring mB and mb are different though the calculation formulae are the same. 展开更多
关键词 local earthquake magnitude surface wave magnitude body wave magnitude
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A theoretical study of correlation between scaled energy and earthquake magnitude based on two source displacement models
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作者 Jeen-Hwa Wang 《Earthquake Science》 2013年第6期373-376,共4页
The correlation of the scaled energy,e = Es/ Mo, versus earthquake magnitude, Ms, is studied based on two models: (1) Model 1 based on the use of the time function of the average displacements, with a ω^-2 source ... The correlation of the scaled energy,e = Es/ Mo, versus earthquake magnitude, Ms, is studied based on two models: (1) Model 1 based on the use of the time function of the average displacements, with a ω^-2 source spectrum, across a fault plane; and (2) Model 2 based on the use of the time function of the average displacements, with a ω^-3 source spectrum, across a fault plane. For the second model, there are two cases: (a) As ζ= T, where r is the rise time and T the rupture time, lg(e) - -Ms; and (b) As ζ 〈〈 T, lg(e)- -(1/2)Ms. The second model leads to a negative value of e. This means that Model 2 cannot work for studying the present problem. The results obtained from Model 1 suggest that the source model is a factor, yet not a unique one, in controlling the correlation of e versus Ms. 展开更多
关键词 Scaled energy earthquake magnitude Seismic-wave energy Seismic moment Source displacemodel
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