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Seismogenic environment and mechanism of the Yangbi M_(S)6.4 earthquake in Yunnan,China

Earthquake Science 2022年第4期35卷 297-310页

作者： Mengqiao Duan Kezhen Zuo cuiping zhao Lianqing Zhou Institute of Geophysics China Earthquake AdministrationBeijing 100081China Liaoning Earthquake Agency Shenyang 110031China Institute of Earthquake Forecasting China Earthquake AdministrationBeijing 100036China

The Yangbi M_(S)6.4 earthquake occurred on May 21,2021 in western Yunnan,China,where moderate earthquakes strike *** exhibited a typical“foreshock-mainshock-aftershock”sequence and did not occur on a pre-existing active *** seismogenic environment and mechanism of this earthquake have aroused considerable research *** this study,we obtain the three-dimensional v_(P),v_(S)and v_(P)/v_(S)images using the v_(P)/v_(S)consistency-constrained double-difference tomography method,which improves the accuracy of v_(P)/v_(S)*** focus on characteristics of v_(P)/v_(S)images in areas with a lateral resolution of 0.1°,and reveal the seismogenic environment of the Yangbi M_(S)6.4 *** conclusions are as follows:(1)Low velocity and high-v_(P)/v_(S)anomalies are revealed at different depths around the northern segment of the Red River fault.v_(S)and v_(P)/v_(S)images along the Weixi-Qiaohou-Weishan fault and the buried faults on its west show obviously segmented feature.(2)The source region of the Yangbi M_(S)6.4 earthquake is located in a low-v_(P)/v_(S)zone implying high medium ***-v_(P)/v_(S)anomalies in its NW direction indicate cracks development and the existence of fluids or partial melts,which are unfavorable for stress accumulation and triggering large *** conditions have also prevented the earthquake sequence from extending northwestward.(3)With the southeastward extrusion of materials from the Tibetan Plateau,fluid migration was blocked by the low-v_(P)/v_(S)body in the source *** high-v_(P)/v_(S)anomaly beneath the source region may implies that the fluids or partial melts in the middle and lower crust gradually weakened medium strength at the bottom of the seismogenic layer,and preparing the largest foreshock in the transition zone of high to low v_(P)/v_(S).Meanwhile,tectonic stress incessantly accumulated in the brittle upper crust,eventually led to the M_(S)6.4 earthquake occurrence.

关键词： Yangbi M_(S)6.4 earthquake v_(P),v_(S),and v_(P)/v_(S)tomography seismogenic environment and mechanism

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Machine learning-based automatic construction of earthquake catalog for reservoir areas in multiple river basins of Guizhou province,China

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Earthquake Science 2023年第2期36卷 132-146页

作者： Longfei Duan cuiping zhao Xingzhong Du Lianqing Zhou Institute of Earthquake Forecasting China Earthquake AdministrationBeijing 100036China PowerChina Guiyang Engineering Corporation Limited Guiyang 550081China

Large reservoirs have the risk of reservoir induced *** detecting and locating microseismic events are crucial when studying reservoir *** earthquake monitoring in reservoir areas is one of the effective measures for earthquake disaster prevention and *** this study,we first applied the automatic location workflow(named LOCFLOW)to process 14-day continuous waveform data from several reservoir areas in different river basins of Guizhou *** with the manual seismic catalog,the recall rate of seismic event detection using the workflow was 83.9%.Of the detected earthquakes,88.9%had an onset time difference below 1 s,81.8%has a deviation in epicenter location within 5 km,and 77.8%had a focal depth difference of less than 5 km,indicating that the workflow has good generalization capacity in reservoir *** further applied the workflow to retrospectively process continuous waveform data recorded from 2020 to the first half of 2021 in reservoir areas in multiple river basins of western Guizhou province and identified five times the number of seismic events obtained through manual *** with manual processing of seismic catalog,the completeness magnitude had decreased from 1.3 to 0.8,and a b-value of 1.25 was calculated for seismicity in western Guizhou province,consistent with the b-values obtained for the reservoir area in previous *** results show that seismicity levels were relatively low around large reservoirs that were impounded over 15 years ago,and there is no significant correlation between the seismicity in these areas and reservoir *** patterns were notably different around two large reservoirs that were only impounded about 12 years ago,which may be explained by differences in reservoir storage capacity,the geologic and tectonic settings,hydrogeological characteristics,and active fault the reservoir *** seismicity persisted around two large reservoi

关键词： river basins in Guizhou reservoir earthquake machine learning earthquake location b-value

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Discussion on 'Was the 2008 Wenchuan earthquake triggered by Zipingpu Reservoir?'

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Earthquake Science 2010年第6期23卷 577-581页

作者： Shiyong Zhou Kai Deng cuiping zhao Wanzheng Cheng School of Earth and Space Sciences Peking University Beijing 100871 China Institute of Earthquake Science China Earthquake Administration Beijing 100036 China Earthquake Administration of Sichuan Province Chengdu 610041 China

Some recent publications presented a result suggesting that Zipingpu reservoir hastened the occurrence of the 2008 Ms8.0 Wenchuan earthquake by tens to hundreds of years. Their researches calculated the Coulomb stress change induced by Zipingpu reservoir on the rupturing fault of Wenchuan earthquake. Their results, however, are critically dependent upon the 3-D event location, reservoir location, and the fault plane orientation. We repeated Ge et al.＇s work in this paper and found that an improper dip angle parameter of their 2-D fault model might lead to a wrong conclusion. Both the modeling results based on the 2-D model and 3-D model with proper fault parameters will show Coulomb stress changes alone were neither large enough nor had the correct orientation to affect the occurrence of Wenchuan earthquake, which supports our recent argument based on the local seismicity analysis and the induced Coulomb stress change calculation with a 3-D model.

关键词： Wenchuan earthquake reservoir induced seismicity Coulomb stress

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Temporal and Spatial Images of Ambient Noise Intensity in the Chinese Mainland

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Earthquake Research in China 2017年第3期31卷 289-308页

作者： Zhou Lianqing Song Xiaodong zhao cuiping Key Laboratory of Earthquake Prediction Institute of Earthquake ScienceCEABeijing 100036China University of Illinois at Urbana-Champaign Urbana IL61801USA Institute of Geophysics China Earthquake AdministrationBeijing 100081China

Successive waveforms of the vertical component recorded by 888 broadband seismic stations in the China Seismography Network from January,2010 to June,2011 are used to investigate the temporal and spatial distribution of ambient noise intensity,and the images of ambient noise intensity at the period of 10 s in the Chinese Mainland are obtained. The temporal variation of ambient noise intensity shows some seasonal and periodic characteristics. The maximum ambient noise intensity occurred from January,2011 to March,2011. The spatial distribution images of ambient noise intensity show obvious zoning features,which doesnt correlate with surface geology,suggesting that the noise field is stronger than the site factors. The strength in southeastern coastal areas reaches its maximum and generally decreases toward to inland areas,and arrives at the minimum in the Qinghai-Tibetan Plateau. The zonal intensity distribution is probably correlated with ocean tides from the Philippine Ocean and the Pacific Ocean. It also shows that the influence from the Indian Ocean seems small. However, the ambient noise intensity increases to a certain degree in the Xinjiang area,indicating that the main source of ambient noise in the western area of the Chinese Mainland is not derived from the East and South China Sea,but rather from the deep interior of the Eurasian continent. The ambient noise intensity obtained in this study can supply reference for seismology research based on ambient noise correlation. Moreover,it can supply basic data for attenuation research based on ambient noise, and thus help achieve the object of retrieving the attenuation of Rayleigh waves from ambient noise.

关键词： Ambient noise Noise source Amplitude of surface wave Attenuation

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Seismic analysis of the Xiluodu reservoir area and insights into the geometry of seismogenic faults

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Earthquake Science 2022年第5期35卷 371-386页

作者： Hongfu Lei Qincai Wang cuiping zhao Ce zhao Jinchuan Zhang Jun Li China Three Gorges Construction Engineering(Group)Co. Ltd.Chengdu 610000China Institute of Earthquake Forecasting China Earthquake AdministrationBeijing 100036China Jiangsu Earthquake Agency Nanjing 210014China The Second Monitoring and Application Center China Earthquake AdministrationXi’an 710054China

The Xiluodu(XLD)reservoir is the second largest reservoir in China and the largest in the Jinsha River *** occurrence of two M>5 earthquakes after reservoir impoundment has aroused great interest among seismologists and plant *** comprehensively analyzed the seismicity of the XLD reservoir area using precise earthquake relocation results and focal mechanism solutions and found that the seismicity of this area was weak before *** impoundment,earthquake activity increased *** occurrence of M≥3.5 earthquakes within five years of impoundment also appear to be closely related to rapid rises and falls in water level,though this correlation weakened after five years because earthquake activity was far from the reservoir *** in the XLD reservoir area are clustered;near the dam(Area A),small faults are intermittently distributed along the river,while Area B is composed of multiple NW-trending left-lateral strikeslip faults and a thrust fault and Area C is composed of a NW-trending left-lateral strike-slip main fault and a nearly EWtrending right-lateral strike-slip minor *** geometries of the deep and the shallow parts of the NW-trending fault *** the action of the NW-trending background stress field,a series of NW-trending left-lateral strike-slip faults and NE-trending thrust faults in critical stress states were dislocated due to the stress caused by reservoir *** two largest earthquakes in the XLD reservoir area were tectonic earthquakes that were directly triggered by impoundment.

关键词： Xiluodu reservoir area double-difference location focal mechanism solution fault geometry reservoir impoundment

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Study on the S-wave Splitting Characteristics in the Longtan Reservoir Area,Guangxi,China

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Earthquake Research in China 2011年第2期25卷 213-226页

作者： Shi Haixia zhao cuiping China Earthquake Networks Center Beijing 100045 China Institute of Earthquake Science China Earthquake Administration Beijing 100036 China

In this paper,the shear wave splitting features of the Longtan reservoir area are studied by adopting the traditional cross-correlation coefficient method and polarization analysis,using the data recorded by the seismic network founded by a project under the National Science and Technology Pillar Program from April 2009 to April *** found that most of polarization directions at seismic stations are consistent with the direction of the overall regional stress field,but local structures and faults may control or influence the fast shear-wave polarization *** time-delay normalized to source-station path is between 10 to 25ms/km,and among them,the time-delay is about 10ms/km at the LIL and XIL sites,which are farther away from the *** water depth is relatively shallow and seismic activity relatively weak after water storage,indicating the effect of reservoir water penetration,or loading,on the state of cracks in the reservoir *** also found that the delay time changes consistently with the water level at stations DPD and *** may be related to crack expansion and water penetration caused by the reservoir impoundment.

关键词： Longtan reservoir Seismic anisotropy Shear-wave splitting Fast shear-wavepolarization direction Delay time

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NNN-链接护理模式在阿尔茨海默病家庭照护者中的应用

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护理实践与研究 2024年第4期21卷 503-509页

作者：陈美华赵翠平李妍杨海燕金璐马婷娜李小娜南京医科大学附属常州第二人民医院老年医学科江苏省常州市213000

目的探讨NNN-链接护理模式在阿尔茨海默病家庭照护者中的应用效果。方法将2021年1—12月医院收治的阿尔茨海默病患者96例及其家庭照护者96名为研究对象,按照组间基本特征具有可比性的原则分对照组和观察组,各48例和48名。对照组对家庭... 详细信息

目的探讨NNN-链接护理模式在阿尔茨海默病家庭照护者中的应用效果。方法将2021年1—12月医院收治的阿尔茨海默病患者96例及其家庭照护者96名为研究对象,按照组间基本特征具有可比性的原则分对照组和观察组,各48例和48名。对照组对家庭照护者实施常规护理干预,观察组对家庭照护者实施NNN-链接护理模式进行干预。比较两组患者认知功能量表(MMSE)、日常生活能力量表评分及家庭照护者SCL-90各维度评分、家庭照护能力量表(FCTI)各维度评分。结果护理干预前,两组患者MMSE量表各维度评分及总分的比较,差异无统计学意义(P>0.05);护理干预6个月后,观察组患者MMSE量表中的定向力、记忆力、计算力、注意力、回忆能力、语言能力及总评分均高于对照组,差异有统计学意义(P0.05);护理干预6个月后,观察组患者日常生活能力评分均高于对照组,差异有统计学意义(P0.05);护理干预6个月后,观察组家庭照护者SCL-90各维度评分均低于对照组,差异有统计学意义(P0.05);护理干预6个月后,观察组家庭照护者FCTI量表中适应照顾角色、处理个人情绪、应变以提供协助、调整生活满足照顾需求及评估家人与社区资源评分均低于对照组,差异有统计学意义(P<0.05)。结论 NNN-链接护理模式可促进阿尔茨海默病患者家庭照护者身心健康,提高照护能力,从而提高患者认知功能及日常生活能力。

关键词： NNN-链接护理模式阿尔茨海默病家庭照护者认知功能日常生活能力身心健康照护能力

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High-performance magnesium/sodium hybrid ion battery based on sodium vanadate oxide for reversible storage of Na^(+)and Mg^(2+)

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Journal of Energy Chemistry 2024年第9期96卷 79-88页

作者： Xiaoke Wang Titi Li Xixi Zhang Yaxin Wang Hongfei Li Hai-Feng Li Gang zhao cuiping Han Institute of Applied Physics and Materials Engineering University of MacaoAvenida da UniversidadeTaipaMacao 999078China School of Physics and Technology University of JinanJinan 250022ShandongChina Songshan Lake Materials Laboratory Dongguan 523808GuangdongChina Faculty of Materials Science and Energy Engineering Shenzhen University of Advanced TechnologyShenzhen 518055GuangdongChina Institute of Technology for Carbon Neutrality Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen 518055GuangdongChina

Magnesium ion batteries(MIBs)are a potential field for the energy storage of the future but are restricted by insufficient rate capability and rapid capacity ***-sodium hybrid ion batteries(MSHBs)are an effective way to address these ***,we report a new type of MSHBs that use layered sodium vanadate((Na,Mn)V_(8)O_(20)·5H_(2)O,Mn-NVO)cathodes coupled with an organic 3,4,9,10-perylenetetracarboxylic diimide(PTCDI)anode in Mg^(2+)/Na^(+)hybrid *** electrochemical cycling,Mg^(2+)and Na^(+)co-participate in the cathode reactions,and the introduction of Na^(+)promotes the structural stability of the Mn-NVO cathode,as cleared by several ex-situ ***,the Mn-NVO cathode presents great specific capacity(249.9 mA h g^(−1)at 300 mA g^(−1))and cycling(1500 cycles at 1500 mA g^(−1))in the Mg^(2+)/Na^(+)hybrid ***,full battery displays long lifespan with 10,000 cycles at 1000 mA g^(−1).The rate performance and cycling stability of MSHBs have been improved by an economical and scalable method,and the mechanism for these improvements is discussed.

关键词： Aqueous battery Hybrid ion battery Mg^(2+)/Na^(+)co-intercalation High-rate performance Organic-water hybrid electrolyte

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Regulating the inner Helmholtz plane structure at the electrolyte-electrode interface for highly reversible aqueous Zn batteries

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Journal of Energy Chemistry 2024年第8期95卷 57-67,I0002页

作者： Jianghe Liu Sanlue Hu Hexin Guo Guobin Zhang Wen Liu Jianwei zhao Shenhua Song cuiping Han Baohua Li Shenzhen Key Laboratory on Power Battery Safety and Shenzhen Geim Graphene Center Tsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhen 518055GuangdongChina Shenzhen Key Laboratory of Advanced Materials School of Materials Science and EngineeringHarbin Institute of TechnologyShenzhen 518055GuangdongChina Faculty of Materials Science and Energy Engineering/Institute of Technology for Carbon Neutrality Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen 518055GuangdongChina Shenzhen HUASUAN Technology Co. Ltd.Shenzhen 518055GuangdongChina

The development of aqueous Zn batteries is limited by parasitic water reactions,corrosion,and dendrite *** address these challenges,an inner Helmholtz plane(IHP)regulation method is proposed by employing low-cost,non-toxic maltitol as the electrolyte *** preferential adsorption behavior of maltitol can expel the water from the inner Helmholtz plane,and thus hinder the immediate contact between Zn metal and H_(2)***,strong interaction between maltitol and H_(2)O molecules can restrain the activity of H_(2)***,the"IHP adsorption effect"along with the low LUMO energy level of maltitol-CF_(3)SO_(3)^(-)can promote the in-situ formation of an organic-inorganic complex solid electrolyte interface(SEI)*** a result,the hydrogen/oxygen evolution side reaction,corrosion,and dendrites issues are effectively suppressed,thereby leading to highly reversible and dendrite-free Zn plating/*** Zn‖I_(2)battery with hybrid electrolytes also demonstrates high electrochemical performance and ultralong cycling stability,showing a capacity retention of 75%over 20000 charge-discharge cycles at a large current density of 5 A g^(-1).In addition,the capacity of the device has almost no obvious decay over20000 cycles even at-30℃.This work offers a successful electrolyte regulation strategy via the IHP adsorption effect to design electrolytes for high-performance rechargeable Zn-ion batteries.

关键词： Inner Helmholtz plane Adsorption effect Dendrite suppression SEI layer Zn||I_(2)battery

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Study on the Source Parameters of Earthquakes in the Middle Eastern Area of North Tianshan in Xinjiang

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Earthquake Research in China 2005年第4期19卷 381-390页

作者： zhao cuiping Xia Aiguo Zheng Sihua Chen Zhangli Institute of Geophysics China Earthquake Administration Beijing 100081 China Earthquake Administration of Xinjiang Uggur Autonomous Region Urumqi 830011 China Institute of Earthquake Sciences CEA Beijing 100036 China.

By applying the empirical Green＇s function method, we first proved that the source spectra in the middle eastern area of North Tianshan follow the ω^-2 Brune model, and then, on this basis, obtained the source spectra for 105 earthquakes of ML 2.5 - 5.7 in the studied area upon removing the noise, instrument, propagation and site effects in the observational seismic S waveforms. Finally, we determined the source parameters such as the seismic moment, stress drop, source dimension, etc., based on the Brune model. The results show that there is a good linear correlation between scalar seismic moment, M0, and ML, which is Log10 M0 = 1.10 ML ＋ 17.20; The source radii range between 100- 1500m; the stress drop, 1-16MPa with a predominant range of 1 - 10MPa. The relationship of the seismic moment versus corner frequencies indicates that there may exist two source scaling, that is, when M0 〈 4×10^21 dyne. cm （equal to an ML4.0 event）, stress drop is weakly dependent on M0： whereas, when M0 〉 4×10^21 dyne·cm, stress drop is independent of M0.

关键词： North Tianshan in Xinjiang Source spectrum Source model Source parameter Source scaling

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