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The April 24, 2013 Changning M_s4.8 earthquake: a felt earthquake that occurred in Paleozoic sediment

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Earthquake Science 2014年第1期27卷 107-115页

作者： Xiangfang Zeng libo han Yaolin Shi CAS Key Laboratory of Computational Geodynamics University of Chinese Academy of Sciences Institute of Geophysics China Earthquake Administration

The dense broadband seismic network provides more high-quality waveform that is helpful to improve constraint focal depth of shallow earthquake. Many shal- low earthquakes occurring in sediment were regarded as induced events. In Sichuan basin, gas industry and salt mining are dependent on fluid injection technique that triggers microseismicity. We method with regional records adopted waveform inversion to obtain focal mechanism of an Ms4.8 earthquake at Changning. The result suggested that the Changning earthquake occurred at a ESE thrust fault, and its focal depth was about 3 km. The depth phases including teleseismic pP phase and regional sPL phase shows that the focal depth is about 2 km. The strong, short- period surface wave suggests that this event is a very shallow earthquake. The amplitude ratio between Rayleigh wave and direct S wave was also used to estimate the source depth of the mainshock. The focal depth （2-4 km） is far less than the depth of the sedimentary layer thickness （6-8 km） in epicentral region. It is close to the depth of fluid injection of salt mining, which may imply that this event was triggered by the industrial activity.

关键词： Wavefonn Induced earthquake Depth phase inversion

The two domains of cotton WLIM1a protein are functionally divergent

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Science China(Life Sciences) 2016年第2期59卷 206-212页

作者： libo han Yuanbao Li Yongduo Sun Haiyun Wang Zhaosheng Kong Guixian Xia State Key Laboratory of Plant Genomics Institute of Microbiology Chinese Academy of Sciences College of Life Sciences University of Chinese Academy of Sciences

Our previous study demonstrated that WLIMla has dual roles in fiber elongation and secondary cell wall synthesis in upland cotton, and the protein acts either as an actin-binding protein or as a transcription factor. Because WLIMla consists of two different LIM domains, it is possible that these elements contribute differentially to the dual functions of the protein. In this study, we dissected the two LIM domains and characterized their biochemical functions. By using red fluorescent protein （RFP） fusion, co-sedimentation, and DNA binding methods, we found that the two domains of WLIM 1 a, domain 1 （D 1） and domain2 （D2）, possessed different biochemical properties. While D1 contributed primarily to the actin filament-bundling activity of WLIMla, D2 contributed to the DNA-binding activity of the protein; both D1 and D2 relied on a linker sequence for their ac- tivities. In addition, we found that WLIMla and its two LIM domains form dimers in vitro. These results may lead to a better understanding of the molecular mechanisms of dual functions of WLIMla during cotton fiber development.

关键词： WLIMla actin bundle transcription factor dual function

Overexpression of GhPFN2 enhances protection against Verticillium dahliae invasion in cotton

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Science China(Life Sciences) 2017年第8期60卷 861-867页

作者： Wenyan Wang Yongduo Sun libo han Lei Su Ouixian Xia Haiyun Wang Institute of Microbiology Chinese Academy of SciencesBeijing 100101China State Key Laboratory of Plant Genomics Beijing 100101China University of Chinese Academy of Sciences Beijing 100049China

Growing evidence indicates that actin cytoskeleton is involved in plant innate immune responses, but the functional mechanism remains largely unknown. Here, we investigated the behavior of a cotton profilin gene （GhPFN2） in response to Verticillium dahliae invasion, and evaluated its contribution to plant defense against this soil-borne fungal pathogen. GhPFN2 expression was up-regulated when cotton root was inoculated with V. dahliae, and the actin architecture was reorganized in the infected root cells, with a clear increase in the density of filamentous actin and the extent of actin btmdling. Compared to the wild type, GhPFN2-overexpressing cotton plants showed enhanced protection against V. dahliae infection and the actin cytoskeleton organization in root epidermal cells was clearly altered, which phenocopied that of the wild-type （WT） root cells challenged with V. dahliae. These results provide a solid line of evidence important for defense against V. dahliae infection. showing that actin cytoskeleton reorganization involving GhPFN2 is

关键词： actin cytoskeleton profilin Verticillium dahliae cotton

China Seismic Experimental Site(CSES): Challenges of Deep Earth Exploration and Practice(DEEP)

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Acta Geologica Sinica(English Edition) 2021年第S01期95卷 59-61页

作者： LI Ying LI Li WANG Long han libo WU Zhongliang Institute of Earthquake Forecasting China Earthquake AdministrationBeijing 100036China Institute of Geophysics China Earthquake AdministrationBeijing 100081China

Since May 2018,the planning,construction and functioning of China Seismic Experimental Site(CSES)has attracted much attention in earthquake science(CSES,2020 a,b,c;Wu,2020;Li et al.,2021).Different from traditional ea... 详细信息

关键词： Deep Earth Exploration and Practice community models China Seismic Experimental Site

Characterization and Pathogenicity of Pseudopestalotiopsis vietnamensis Causing Gray Blight of Wuyi Rock Tea(Camellia sinensis)in China and Specific Mechanisms of Disease Infection

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Phyton-International Journal of Experimental Botany 2023年第1期92卷 131-147页

作者： Guangheng Wu Lu Rui Xiang Lu libo han Gan Lv Xianyu Fu Jinxian Liu Nong Zhou Chuanhai Zhang Fujian Provincial Key Laboratory of Eco-Industrial Green Technology College of Ecology and Resources EngineeringWuyi UniversityWuyishan354300China Key Laboratory of Ministry of Education for Genetics Breeding and Multiple Utilization of CropsPlant Immunity CenterFujian Agriculture and Forestry UniversityFuzhou350002China Chongqing Engineering Laboratory of Green Planting and Deep Processing of Famous-Region Drug in the Three Gorges Reservoir Region College of Biology and Food EngineeringChongqing Three Gorges UniversityChongqing404120China State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China Sichuan Agricultural UniversityChengdu611130China College of Tea and Food Science Wuyi UniversityWuyishan354300China

Gray blight disease(GBD)causes significant losses in tea production in *** genes and biological processes involved in resistance to fungal disease in tea plants have been identified,specific mechanisms of the GBD infection process remain *** this study,morphological and multi-gene(TEF-TUB-ITS)phylogenetic characteristics were used to identify isolate CLBB1 of Pseudopestalotiopsis *** tests confirmed that isolate CLBB1 from tea leaves caused GBD in the susceptible tea cultivar Wuyi Rock(Camellia sinensis *** ***).Spores began to germinate 24 h after infection(hai),and after 48 h,elongated fungal hyphae formed from a single *** analysis revealed that 482,517,and 369 genes were differentially expressed at 24,48,and 72 hai,respectively,in Wuyi Rock tea *** CLBB1 infection elicited phenotype-related responses and activated defense-related pathways,including plant–pathogen interaction,MAPK signaling,and plant hormone signal transduction,suggesting a possible mechanism underlying phenotype-based susceptibility to ***,a new *** strain causing GBD in the tea cultivar‘Shuixian’was discovered in this *** analysis indicated that pathogen invasion activated chitin-related MAPK pathways and that tea plants required a hormone to restrict CLBB1.

关键词： Chitin-related MAPK pathways gray blight disease Pseudopestalotiopsis tea transcriptional analysis

Ambient noise tomography of a linear seismic array based on an improved Voronoi tessellation

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Earthquake Science 2023年第6期36卷 477-490页

作者： Kun Wang Weitao Wang libo han Tingzi Li Yuan Ling Jianchao Zhou Huaiyu Yuan Institute of Geophysics China Earthquake AdministrationBeijing 100081China Institute of Geology and Geophysics Chinese Academic of SciencesBeijing 100029China Geological Survey of Western Australia PerthWA 6001Australia

Ambient noise tomography,when applied to a dense linear seismic array,has the capability to provide detailed insights into the fine velocity structures across diverse tectonic *** linear station arrangement naturally generates parallel and concentrated ray paths along the array *** unique geometry requires specific optimization of the inversion methodology and model *** Bayesian-based transdimensional inversion method,characterized by its fully non-linear nature and high degree of freedom in parameter settings,offers a powerful tool for ambient noise *** effectively adapt this method to a linear array layout,we propose a modification to the Voronoi cell tessellation built in the transdimensional *** introducing spatial priority to the Voronoi kernels,we strategically increased the density of Voronoi cells along the direction of the *** then applied the modified approach to a linear seismic array in the North China Craton and validated its robustness through phase velocity images and resolution *** improved non-uniform sampling technique in the 2-D model space accelerates convergence while simultaneously enhancing model *** with the conventional damped leastsquares method,the proposed algorithm revealed a shear-wave velocity map with notable low-velocity anomalies situated in the middle and lower crust beneath the borders of the Ordos block and its surrounding orogenic *** with the crustal structures revealed by receiver function and electrical imaging,our findings indicated that the western and eastern margins of the Ordos block had experienced intensive crustal wedge deformation and re-melting,respectively.

关键词： Voronoi cell transdimensional Bayesian method ambient noise inversion S velocity North China Craton

Seismogenic model of the 2023 M_(W)5.5 Pingyuan earthquake in North China Plain and its tectonic implications

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Earthquake Science 2024年第6期37卷 499-513页

作者： Shiguang Wang libo han Junju Xie Liping Fan Xiang Huang Jinmeng Bi Hongfeng Yang Lihua Fang Institute of Geophysics China Earthquake AdministrationBeijing 10081China Tianjin Earthquake Agency Tianjin 300201China Earth System Science Programme The Chinese University of Hong KongShatinHong Kong 999077China Beijing Baijiatuan Earth Science National Observation and Research Station Beijing 100095China

The 6 August 2023 M_(W)5.5 Pingyuan earthquake is the largest earthquake in the central North China Plain(NCP)over the past two *** to the thick sedimentary cover,no corresponding active faults have been reported yet in the epicenter ***,this earthquake presents a unique opportunity to delve into the buried active faults beneath the *** integrating strong ground motion records,high-precision aftershock sequence relocation,and focal mechanism solutions,we gain insights into the seismotectonics of the Pingyuan *** aftershocks are clustered at depths ranging from 15 to 20 km and delineate a NE-SW trend,consistent with the distribution of ground motion records.A NE-SW nodal plane(226°)of the focal mechanism solutions is also derived from regional waveform inversion,suggesting that the mainshock was dominated by strike-slip motion with minor normal faulting *** regional geological data,we propose that an unrecognized fault between the NE-SW trending Gaotang and Lingxian-Yangxin faults is the seismogenic fault of this *** on the S-wave velocity structure beneath the NCP,this fault probably extends into the lower crust with a high *** the tectonic regime and stress state,we speculate that the interplay of shear strain between the Amurian and South China blocks and the hot upwelling magma from the subducted paleo Pacific flat slab significantly contributed to the generation of the Pingyuan earthquake.

关键词： Pingyuan earthquake aftershock relocation focal mechanism S-wave velocity structure North China Plain

Study of Minimum Magnitude of Completeness in the North-South Trending Seismic Belt for the Collaboratory for the Study of Earthquake Predictability Project

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Earthquake Research in China 2012年第4期26卷 432-443页

作者： han libo Jiang Changsheng Li Yan'e Guo Xiangyun Institute of Geophysics CEA

To determine the studying region of China Testing Center of the Collaboratory for the Study of Earthquake Predictability （CSEP）, we adopted the Entire-Magnitude-Range （EMR） method to study the spatial distribution of minimum magnitude of completeness （Mc） in the North-South Trending Seismic Belt （NSTSB） during the period from October 1, 2008 to May 31, 2011. Also bootstrap testing was performed to estimate the uncertainty of Mc, i. e. 8Mc. The results show that Mc （EMR） = 1.6 ± 0. 03 for the whole region. From the spatial distributions of Mc we find that Mc is in the range of Mu 1.3 ±2.0 for most regions. Specifically, the spatial distribution of Mc is consistent with the distribution of stations indicating high monitoring level in the southern part and low monitoring level in the northern part. Events located with less than three stations have great influence on Me. Moreover, the uncertainty of minimum magnitude of completeness 6Mc ranges from 0. 07 to 0.22. The spatial distribution of 6Mc agrees with the seismic rate. The shorter time span may cause larger 6Mc

关键词： Earthquake Predictability CSEP Minimum magnitude of completeness(MC) Entire-Magnitude-Range (EMR) method

Cytoskeletal control of trichome cell shaping: from Arabidopsis trichomes to cotton fibers

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Cytoskeletal control of trichome cell shaping: from Arabidop...