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Source characteristics of the mainshock and aftershocks of the 2019 Changning earthquake sequence:Implications for fluid effects

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Science China Earth Sciences 2023年第6期66卷 1321-1333页

作者： Kun DAI Yong ZHENG rumeng guo Jianqiao XU School of Physics Huazhong University of Science and TechnologyWuhan 430074China Innovation Academy for Precision Measurement Science and Technology Chinese Academy of SciencesWuhan 430071China State Key Laboratory of Geological Processes and Mineral Resources School of Geophysics and GeomaticsChina University of GeosciencesWuhan 430074China

The 2019 M_(S)6.0 Changning earthquake occurred in the tectonically stable Sichuan Basin,where the epicenter and its adjacent areas are important shale gas and salt mine production fields,resulting in hot debates on whether the seismogenic mechanism of the 2019 Changning earthquake is related to human activities.As source characteristics and fluid pressure can provide important constraints on whether an earthquake is induced,weinvestigate the seismogenic mechanisms of the mainshock and 9 MW≥4.0 aftershocks.In overall,the mainshock and the majority of the aftershocks are characterized by relatively shallow focal depths(1‒4 km)and significant non-double-couple(non-DC)components.However,the mainshock and the aftershocks differ in two aspects:(1)the compensated-linear-vector-dipole components dominate the non-DC components of the mainshock,whereas the isotropic components dominate the most aftershocks;(2)the fluid overpressure of the mainshock is over 30 MPa,whereas the fluid overpressure of the most aftershocks is less than 10 MPa.Thus,we propose that the mainshock is triggered by weakened fault strength with long-term fluid injection,and that its large non-DC components are associated withcomplex rupture processes.Comparatively,the aftershocks may be triggered by postseismic stress transfer by combining the Coulomb failure stress changes in the poroelastic medium.Our results highlight the possible role of fluid in the occurrence of the Changning earthquake sequence.

关键词： The 2019 Channing earthquake Induced earthquakes Non-double-couple components Focal depths Poroelasticity

Earthquake potential of the seismic gap between the Wenchuan and Lushan earthquakes:Current status,thoughts,and challenges

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Science China Earth Sciences 2021年第3期64卷 503-506页

作者： Yong ZHENG rumeng guo State Key Laboratory of Geological Processes and Mineral Resources Institute of Geophysics and GeomaticsChina University of Geosciences(Wuhan)Wuhan430074China Earth System Science Programme The Chinese University of Hong KongHong Kong999077China Institute of Precision Measurement Science and Technology Innovation Chinese Academy of SciencesWuhan430071China College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijing100049China

1.Background on the seismic gap between the Wenchuan and the Lushan earthquakes The 2008 Mw7.9 Wenchuan earthquake and the 2013 Mw6.9 Lushan earthquake,which occurred in the Longmenshan fault system(hereafter called LMSFS),caused dramatically casualties and huge economic losses.Their aftershock zones outline a seismic gap of about 50 km(Figure 1).

关键词： seismic earthquake fault

Rapid report of the 8 January 2022 M_(S)6.9 Menyuan earthquake,Qinghai,China

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Earthquake Research Advances 2022年第1期2卷 4-14页

作者： Hongfeng Yang Dun Wang rumeng guo Mengyu Xie Yang Zang Yue Wang Qiang Yao Chuang Cheng Yanru An Yingying Zhang Earth System Science Programme Faculty of ScienceThe Chinese University of Hong KongShatinNTHong KongChina China University of Geosciences Wuhan WuhanHubeiChina State Key Laboratory of Geodesy and Earth's Dynamic Innovation Academy for Precision Measurement Science and TechnologyChinese Academy of SciencesWuhanChina China Earthquake Networks Center China Earthquake AdministrationBeijingChina

The M_(S)6.9 Menyuan earthquake in Qinghai Province,west China is the largest earthquake by far in 2022.The earthquake occurs in a tectonically active region,with a background b-value of 0.87 within 100 km of the epicenter that we derived from the unified catalog produced by China Earthquake Networks Center since late 2008.Field surveys have revealed surface ruptures extending 22 km along strike,with a maximum ground displacement of 2.1 m.We construct a finite fault model with constraints from In SAR observations,which showed multiple fault segments during the Menyuan earthquake.The major slip asperity is confined within 10 km at depth,with the maximum slip of 3.5 m.Near real-time back-projection results of coseismic radiation indicate a northwest propagating rupture that lasted for~10 s.Intensity estimates from the back-projection results show up to a Mercalli scale of IX near the ruptured area,consistent with instrumental measurements and the observations from the field surveys.Aftershock locations(up to January 21,2022)exhibit two segments,extending to~20 km in depth.The largest one reaches M_(S)5.3,locating near the eastern end of the aftershock zone.Although the location and the approximate magnitude of the mainshock had been indicated by previous studies based on paleoearthquake records and seismic gap,as well as estimated stressing rate on faults,significant surfacebreaching rupture leads to severe damage of the high-speed railway system,which poses a challenge in accurately assessing earthquake hazards and risks,and thus demands further investigations of the rupture behaviors for crustal earthquakes.

关键词： Surface rupture Coseismic slip Real-time Intensity Aftershock location and statistics Earthquake magnitude forecasting

Rupture model of the 2013 M_W 6.6 Lushan (China) earthquake constrained by a new GPS data set and its effects on potential seismic hazard

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Earthquake Science 2018年第3期31卷 117-125页

作者： rumeng guo Yong Zheng Faqi Diao Xiong Xiong Jiao Xu State Key Laboratory of Geodesy and Earth's Dynamics Institute of Geodesy and Geophysics Chinese Academy of Sciences Wuhan 430077 China Institute of Geophysics and Geomatics China University of Geosciences Wuhan 430074 China College of Earth Sciences University of Chinese Academy of Sciences Beijing 100049 China

Vertical records are critically important when determining the rupture model of an earthquake, especially a thrust earthquake. Due to the relatively low fitness level of near-field vertical displacements, the precision of previous rupture models is relatively low, and the seismic hazard evaluated thereafter should be further updated. In this study, we applied three-component displacement records from GPS stations in and around the source region of the 2013 MW6.6 Lushan earthquake to re-investigate the rupture model.To improve the resolution of the rupture model, records from both continuous and campaign GPS stations were gathered, and secular deformations of the GPS movements were removed from the records of the campaign stations to ensure their reliability. The rupture model was derived by the steepest descent method（SDM）, which is based on a layered velocity structure. The peak slip value was about 0.75 m, with a seismic moment release of 9.89 × 1018 N·m, which was equivalent to an MW6.6 event. The inferred fault geometry coincided well with the aftershock distribution of the Lushan earthquake. Unlike previous rupture models, a secondary slip asperity existed at a shallow depth and even touched the ground surface. Based on the distribution of the co-seismic ruptures of the Lushan and Wenchuan earthquakes, post-seismic relaxation of the Wenchuan earthquake, and tectonic loading process, we proposed that the seismic hazard is quite high and still needs special attention in the seismic gap between the two earthquakes.

关键词： Lushan earthquake steepest descent method rupture model

Rapid report of the 8 January 2022 M;6.9 Menyuan earthquake,Qinghai, China

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Earthquake Research Advances 2022年

作者： Hongfeng Yang Dun Wang rumeng guo Mengyu Xie Yang Zang Yue Wang Qiang Yao Chuang Cheng Yanru An Yingying Zhang Earth System Science Programme Faculty of Science The Chinese University of Hong Kong China University of Geosciences Wuhan State Key Laboratory of Geodesy and Earth's Dynamic Innovation Academy for Precision Measurement Science and Technology Chinese Academy of Sciences China Earthquake Networks Center China Earthquake Administration

The M;6.9 Menyuan earthquake in Qinghai Province, west China is the largest earthquake by far in 2022. The earthquake occurs in a tectonically active region, with a background b-value of 0.87 within 100 km of the epicenter that we derived from the unified catalog produced by China Earthquake Networks Center since late2008. Field surveys have revealed surface ruptures extending 22 km along strike, with a maximum ground displacement of 2.1 m. We construct a finite fault model with constraints from InSAR observations, which showed multiple fault segments during the Menyuan earthquake. The major slip asperity is confined within 10 km at depth, with the maximum slip of 3.5 m. Near real-time back-projection results of coseismic radiation indicate a northwest propagating rupture that lasted for ～10 s. Intensity estimates from the back-projection results show up to a Mercalli scale of IX near the ruptured area, consistent with instrumental measurements and the observations from the field surveys. Aftershock locations（up to January 21, 2022） exhibit two segments, extending to ～20 km in depth. The largest one reaches MS5.3, locating near the eastern end of the aftershock zone. Although the location and the approximate magnitude of the mainshock had been indicated by previous studies based on paleoearthquake records and seismic gap, as well as estimated stressing rate on faults, significant surfacebreaching rupture leads to severe damage of the high-speed railway system, which poses a challenge in accurately assessing earthquake hazards and risks, and thus demands further investigations of the rupture behaviors for crustal earthquakes.

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Perinatal outcomes of re-recurrent gestational diabetes mellitus and their prognostic factors:A retrospective cohort study in China

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Chinese Medical Journal 2024年第4期137卷 499-501页

作者： Xia Xu Yanni guo Tingting Liao Huale Zhang rumeng Jiang Shuyao Huang Jianying Yan Department of Obstetrics and Gynecology Maternity and Child Health Hospital College of Clinical Medicine for Obstetrics&Gynecology and PediatricsFujian Medical UniversityFuzhouFujian 350001China

To the Editor:Gestational diabetes mellitus(GDM)is a pathologic condition in which glucose intolerance and insulin resistance develop to different degrees during pregnancy.Women with GDM have higher odds of adverse maternal and fetal outcomes.Patients with a history of GDM were at a significantly increased risk for recurrence of GDM in subsequent pregnancies.Our previous and some other studies found an increased incidence of adverse perinatal outcomes in pregnant with recurrent GDM.^([1])So far,women with a prior history of GDM are not recommended to refrain from subsequent pregnancy in light of the limited available data.What about those women with a history of recurrent GDM?Should women with recurrent GDM be recommended to avoid further pregnancy?Currently,studies on perinatal outcomes of women with re-recurrent GDM and their prognostic factors are very rare.Therefore,this retrospective cohort study was performed to explore perinatal outcomes of pregnant woman with re-recurrent GDM and their prognostic factors.

关键词： mellitus pregnancy diabetes

Interfacial enhancement of Ag and Cu particles sintering using(111)-oriented nanotwinned Cu as substrate for die-attachment

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China Welding 2022年第1期31卷 22-28页

作者：郭如梦肖宇博高悦周士祺刘洋刘志权 Shenzhen Institute of Advanced Electronic Materials Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China Shenzhen College of Advanced Technology University of Chinese Academy of SciencesShenzhen 518055China School of Material Science and Engineering Harbin University of Science and TechnologyHarbin 150040China

The electroplated(111)-oriented nanotwinned-Cu(nt-Cu) film was utilized as substrate for Ag and Cu sinter joining to improve the weak interface connection between the metal paste and the substrate.It was found that both Cu and Ag sinter joints using(111)-oriented nt-Cu film exhibited a higher bonding strength than that using traditional random-oriented Cu film.Especially,the joints sintered with Cu paste on(111)-oriented nt-Cu film possessed a higher bonding strength of 53.7 MPa at the sintering condition of 300 °C,0.4 MPa in N2 atmosphere,compared to that on random-oriented Cu film with a value of 31.3 MPa.The results show that as metal substrate layer,the(111)-oriented nt-Cu film can improve the connection performance of Ag and Cu sinter joints,which could further promote their application in dieattachment technology for the next-generation power semiconductors.

关键词： nanotwinned copper sinter joining Ag and Cu paste interface bonding strength

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卫星大地测量成像地震周期形变研究综述

武汉大学学报（信息科学版） 2022年第6期47卷 799-806页

作者：郭汝梦杨浩哲汤雄伟张文婷徐晓雪刘德川孙和平中国科学院精密测量科学与技术创新研究院大地测量与地球动力学国家重点实验室湖北武汉430071 中国科学院大学北京100049 中国地震局第二监测中心陕西西安710054 中国地质大学(武汉)地球物理与空间信息学院湖北武汉430074

近年来,卫星大地测量技术的快速发展为精确测量地壳形变和断层行为提供了前所未有的多维观测数据。它与地震学的结合使得地震周期形变监测的时空分辨率大大提升,为更加深入地研究地震周期过程和机理提供了一个窗口,地震大地测量学应运... 详细信息

近年来,卫星大地测量技术的快速发展为精确测量地壳形变和断层行为提供了前所未有的多维观测数据。它与地震学的结合使得地震周期形变监测的时空分辨率大大提升,为更加深入地研究地震周期过程和机理提供了一个窗口,地震大地测量学应运而生。它能够对地壳运动进行定量描述、对断层活动进行精准建模,从而为洞悉整个地震周期过程的应力应变演化提供科学依据,同时为评估地震危险性、实现地震预测预警提供科学指导。以卫星大地测量观测探究断层形变为主线,分析了断层处于地震周期不同阶段的运动学特征(震间、同震和震后),回顾了地震大地测量学在震源物理方面的一些重要发现。研究表明,利用卫星大地测量数据判定断层所处地震周期的阶段是实现地震预测的可行思路。

关键词：卫星大地测量地壳运动地震周期地震危险性

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鸭星状病毒血清1型单克隆抗体的制备与鉴定

畜牧与兽医 2023年第7期55卷 87-94页

作者：郭茹梦佟贺吴坤董永毅曹瑞兵南京农业大学动物医学院江苏南京210095 江苏省动物疫病预防控制中心江苏南京210036

为制备鸭星状病毒血清1型(DAstV-1)单克隆抗体,本研究以原核表达的重组VP70蛋白免疫6~8周龄雌性BALB/c小鼠,3次免疫后取免疫小鼠脾细胞与SP2/0骨髓瘤细胞进行融合。利用间接ELISA方法筛选到5株阳性单克隆杂交瘤细胞株,分别命名为1G11、... 详细信息

为制备鸭星状病毒血清1型(DAstV-1)单克隆抗体,本研究以原核表达的重组VP70蛋白免疫6~8周龄雌性BALB/c小鼠,3次免疫后取免疫小鼠脾细胞与SP2/0骨髓瘤细胞进行融合。利用间接ELISA方法筛选到5株阳性单克隆杂交瘤细胞株,分别命名为1G11、1G5、1D5、5A10和5F3。Western blot试验表明,5株单抗均能特异性识别293T细胞中表达的VP70蛋白。间接免疫荧光试验(IFA)显示,5株单抗均能与LMH细胞中的DAstV-1抗原发生特异性反应。制备小鼠腹水,通过间接ELISA检测其中VP70蛋白特异性抗体含量,其中1G1效价为1∶1 024 000,1G11和1D5效价为1∶256 000,5A10和5F3效价为1∶128 000。相加ELISA结果显示,5株单抗可能识别相同的抗原表位。本研究制备的单抗为DAstV-1检测方法的建立提供了有效材料,也为该病毒的感染与致病机制研究奠定了基础。

关键词：鸭星状病毒1型 VP70蛋白单克隆抗体