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Applied Mathematics and Mechanics(English Edition) 2023年第2期44卷 189-206页

作者： yutao shi Chengjun XU Bingbing CHEN Jianqiu ZHOU Rui CAI School of Mechanical and Power Engineering Nanjing Tech UniversityNanjing 210000China School of Energy Science and Engineering Nanjing Tech UniversityNanjing 210000China State Key Laboratory of Materials-Oriented Chemical Engineering Nanjing Tech UniversityNanjing 210009China

Flexible solid-state battery has several unique characteristics including high flexibility,easy portability,and high safety,which may have broad application prospects in new technology products such as rollup displays,power implantable medical devices,and wearable *** interfacial mechanical and electrochemical problems caused by bending deformation,resulting in the battery damage and failure,are particularly ***,a fully coupled electro-chemo-mechanical model is developed based on the actual solid-state battery ***-dependent material parameters,stress-dependent diffusion,and potential shift are *** to four bending forms(k=8/mm,0/mm,-8/mm,and free),the results show that the negative curvature bending is beneficial to reducing the plastic strain during charging/discharging,while the positive curvature is ***,with respect to the electrochemical performance,the negative curvature bending creates a negative potential shift,which causes the battery to reach the cut-off voltage earlier and results in capacity *** results enlighten us that suitable electrode materials and charging strategy can be tailored to reduce plastic deformation and improve battery capacity for different forms of battery bending.

关键词： solid-state battery electro-chemo-mechanical coupling model bending deformation phase-transformation plastic deformation

A rupture blank zone in middle south part of Longmenshan Faults: Effect after Lushan M_s7.0 earthquake of 20 April 2013 in Sichuan, China

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Science China Earth Sciences 2014年第9期57卷 2036-2044页

作者： GAO Yuan WANG Qiong ZHAO Bo shi yutao Institute of Earthquake Science China Earthquake Administration Institute of Geophysics China Earthquake Administration China Earthquake Networks Center China Earthquake Administration

On April 20, 2013, the Lushan M^7.0 earthquake struck at the southern part of the Longmenshan fault in the eastern Tibetan Plateau, China. The shear-wave splitting in the crust indicates a connection between the direction of the principal crustal com- pressive stress and the fault orientation in the Longmenshan fault zone. Our relocation analysis of the aftershocks of the Lushan earthquake shows a gap between the location of the rupture zone of the Lushan Ms7.0 earthquake and that of the rup- ture zone of the Wenchuan MsS.0 earthquake. We believe that stress levels in the crust at the rupture gap and its vicinity should be monitored in the immediate future. We suggest using controlled source borehole measurements for this purpose.

关键词： Lushan earthquake Longmenshan Fault rupture gap crustal seismic anisotropy double difference relocation borehole measurements of stress change

Quasi-waveform seismic tomography of crustal structures in the capital circle region of China

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Science China Earth Sciences 2021年第1期64卷 110-126页

作者： Xueyuan HUANG Dinghui YANG Ping TONG Yuan GAO yutao shi Hao WU Department of Applied Statistics School of Mathematics and StatisticsBeijing Technology and Business UniversityBeijing 100048China Department of Mathematical Sciences Tsinghua UniversityBeijing 100084China Division of Mathematical Sciences School of Physical and Mathematical SciencesNanyang Technological UniversitySingapore 637371Singapore Asian School of the Environment Nanyang Technological UniversitySingapore 637371Singapore Institute of Earthquake Science China Earthquake AdministrationBeijing 100036China

Seismic tomography is one of the main tools to explore the interior of the *** this study,the quasi-waveform seismic tomographic method is used for the first time to reveal the crustal structures in the capital region of China.3-D highresolution V_P,V_S and the Poisson’s ratio models are generated by inverting 29839 direct P-and 29972 direct S-wave traveltimes selected from 3231 local *** results reveal strong crustal *** velocity anomalies at shallow depths are well consistent with surface geologic *** relatively low-velocity anomaly layer in the middle crust may be the result of multiple phases of tectonic *** generally occurred on the boundaries of high-and low-velocity and Poisson’s ratio *** are obvious low-velocity anomalies below the hypocenters of the Tangshan earthquake and the historical Sanhe-Pinggu earthquake,implying the existence of *** similar velocity structures around the hypocenters of the two earthquakes indicate that the occurrences of the two earthquakes may be related to the same *** highresolution velocity models provide important observational constraints on the small-scale heterogeneities and dynamic mechanism of the crust in the capital region of China.

关键词： Quasi-waveform inversion Capital circle region Seismic tomography Crustal velocity structure Heterogeneity

Relocation of aftershocks of the Wenchuan M_S8.0 earthquake and its implication to seismotectonics

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Earthquake Science 2011年第1期24卷 107-113页

作者： Bo Zhao yutao shi Yuan Gao Institute of Earthquake Science China Earthquake Administration Beijing 100036 China

From 14：28 （GMT＋8） on May 12th, 2008, the origin time of Ms8.0 Wenchuan earthquake, to December 31th, 2008, more than 10 000 aftershocks （M〉2.0） had been recorded by the seismic networks in Sichuan and surrounding areas. Using double difference algorithm, the main shock and more than 7 000 aftershocks were relocated. The aftershocks distribute about 350 km long. The depths of aftershocks are mainly between 10 km and 20 km. The average depth of aftershocks is about 13 km after relocation. In the southwest, the distribution of aftershocks is along the back-range fault, the central-range fault and the front-range fault of Longmenshan faults. In the middle, the distribution of aftershocks is along the central-range fault. In the north, aftershocks are relocated along the Qingchuan-Pingwu fault. Relocations suggest that the back-range fault mainly induced and controlled the aftershoek occurrence in the northern section of aftershocks sequence. The Ms8.0 main shock is between central-range and front-range of Longmenshan faults and is near the shear plane of the fault bottom. From the depth distribution of aftershock sequence, it suggests that these three faults show imbricate thrust structure.

关键词： earthquake location double difference algorithm Wenchuan earthquake Longmenshan faults

Crust-mantle coupling in North China:Preliminary analysis from seismic anisotropy

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Chinese Science Bulletin 2010年第31期55卷 3599-3605页

作者： GAO Yuan WU Jing YI GuiXi shi yutao Institute of Earthquake Science China Earthquake Administration Beijing 100036 China Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029 China Earthquake Administration of Sichuan Province Chengdu 610041 China

Data from the CASN(Capital Area Seismograph Network),NSNC(National Seismograph Network of China),and IRIS(Incorporated Research Institutions for Seismology) are compared with data from a temporary North China Seismic Array to obtain the background orientation of the horizontal crustal principal compressive stress at NE 95.1°±15.4° in North *** are corrected for disturbances of faults and irregular tectonics,and are used to constrain the fast SKS polarization at NE 110.2°±15.8° in North *** station analyses suggests that there is consistently more than 10° difference between the polarizations of fast shear-wave in the crust and those of fast SKS *** anisotropic phase velocities of Rayleigh waves at different periods also indicate an orientation change for fast velocity with *** suggests the crust-mantle coupling in North China follows neither the simple decoupling model nor the strong coupling ***,it is possibly some inhomogeneous combination of two models or some gradual-change model of physical *** study shows that anisotropy in the crust and mantle could be multiply characterized more correctly and crust-mantle coupling could be analyzed further,if increasing near-field shear-wave splitting data that indicate crustal anisotropy,combined with the azimuthal anisotropy of Rayleigh waves,besides the result of SKS splitting travelling through lithosphere and surface GPS measurements.

关键词：地震各向异性耦合模型中国壳幔 Rayleigh波方位各向异性剪切波分裂地震台网

Receiver function structures beneath the Haiyuan fault on the northeastern margin of the Tibetan plateau

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Earthquake Science 2021年第4期34卷 367-377页

作者： yutao shi Yuan Gao Laiyu Lu Institute of Earthquake Forecasting China Earthquake AdministrationBeijing 100036China Institute of Geophysics China Earthquake AdministrationBeijing 100081China

We performed a receiver function analysis on teleseismic data recorded along two dense seismic profiles and from 4 broadband regional seismic stations across the northeastern Tibetan *** crustal thickness and vP/vS ratio were measured by the H-κdomain search *** Moho discontinuity across the Haiyuan arc fault zone was also revealed by common conversion point(CCP)*** study results show that the crustal thickness and the vP/vS ratio were 42–56 km and 1.60–1.88,*** crustal thickening on the northeastern margin indicates that the crust is shortening or that there was a superimposition of crusts during the collision of the Tibetan plateau with Eurasian *** results suggest that Haiyuan fault likely resulted from the interactions of high temperature and pressure conditions during the collision of the Indian and Asian *** Moho beneath the Haiyuan tectonic region exhibits an obvious offset and a vague discontinuity according to CCP *** study suggests that the Haiyuan arc fault zone is a trans-crustal fault that cuts through the Moho in the northeastern Tibetan ***,there are indications of strong deformation in the intensive crustal extrusion from the interior of the Tibetan Plateau to its northeastern margin.

关键词： Haiyuan fault Receiver function Crustal thickness vP/vS ratio

Crustal thickness and v_P/v_S ratio in Shanxi Graben, China

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Earthquake Science 2014年第6期27卷 589-597页

作者： yutao shi Yuan Gao Honglin Jing Institute of Earthquake Science China Earthquake Administration

Shanxi Graben is in the middle part of the North China Craton, from south to north. With the teleseismic data recorded by Regional Seismograph Networks and the temporary ZBnet-W Seismic Array around east part of Shanxi Graben, we measured the crustal thickness and Vp/Vs ratio beneath each station using the H-K stack of receiver functions. The observed crustal thickness shows obvious lateral variation, increasing gradually from east to west in the Shanxi Graben. Beneath the Shanxi Graben the crust is relatively thicker than both sides of the south and the north. In addition, the Vp/Vs ratio in the north of study zone is higher than that in the south. The highest Vp/Vs ratio exists in the crust of the Xinding basin and the Datong basin. Our study also suggests that high velocity ratio might result from the strong activities of the magmation and volcanism.

关键词： Shanxi Graben North China Craton (NCC) Receiver function Crustal thickness - Crustal Vp/Vs ratio

Preliminary seismic anisotropy in the upper crust of the south segment of Xiaojiang faults and its tectonic implications

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Earthquake Science 2021年第1期34卷 64-76页

作者： Ying Li Yuan Gao yutao shi Peng Wu Key Laboratory of Earthquake Prediction Institute of Earthquake ForecastingChina Earthquake AdministrationBeijing 100036China Institute of Geophysics China Earthquake AdministrationBeijing 100081China Handan Central Seismic Station Hebei Earthquake AgencyHandanHebei 056001China

The Xiaojiang faults,striking north-tosouth(NS),and the Honghe faults,striking north-to-west(NW),are first-order block boundaries that intersect to form a concentrated stress zone at an acute angle in the southern part of the Sichuan-Yunnan rhombic block(SYB).It is also a crucial zone for material escaping from the Tibetan Plateau(TP)due to the collision between the Indian Plate and the Eurasian *** December 2017,the Institute of Earthquake Forecasting of the China Earthquake Administration(CEA)deployed a linear temporary seismic broadband array,the Honghe-Xiaojiang temporary Seismic Array(HX Array),across first-order block boundaries in the southern *** using the waveform data of small earthquakes recorded by stations in the HX Array across Xiaojiang faults from 2017 to 2019,and by permanent seismic stations of the China National Earthquake Networks from 2012 to 2019,this paper adopts the systematic analysis method of shear-wave splitting(SWS),SAM method,to obtain preliminary results for seismic anisotropy in the upper *** study area can be divided into two subzones according to the spatial distribution of the directions of polarization of the fast shear-wave(PFS)at the stations:the northern zone(zone A,where the HX Array is located)and the southern zone(zone B,to the south of the HX Array).The results show that the directions of the PFS at stations in zone A were highly consistent,dominant in the NE direction,correlated with the in-situ principal compressive stress,and were seemingly unaffected by the Xiaojiang *** directions of the PFS as recorded at stations in zone B were more complicated,and were dominant in the NS direction parallel to that of the regional principal compressive *** suggests the joint influence of complex tectonics and regional stress in this narrow wedge *** referring to the azimuthal anisotropy derived from seismic ambient noise in the southeast margin of the TP,the NS direction of the PFS in the middle and l

关键词： Xiaojiang faults temporary seismic array shearwave splitting anisotropy in the upper crust stress

Seismic relocation,focal mechanism and crustal seismic anisotropy associated with the 2010 Yushu M_S7.1 earthquake and its aftershocks

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Earthquake Science 2012年第1期25卷 111-119页

作者： Bo Zhao yutao shi Yuan Gao China Earthquake Networks Center Beijing 100045China Institute of Earthquake Science China Earthquake AdministrationBeijing 100036China Institute of Geophysics China Earthquake AdministrationBeijing 100081China

The 2010 Yushu MsT.1 earthquake occurred in Ganzi-Yushu fault, which is the south boundary of Bayan Har block. In this study, by using double difference algorithm, the locations of mainshock （33.13°N, 96.59°E, focal depth 10.22 km） and more than 600 aftershocks were obtained. The focal mechanisms of the mainshock and some aftershocks with Ms〉3.5 were estimated by jointly using broadband velocity waveforms from Global Seismic Network （GSN） and Qinghai Seismic Network as well. The focal mechanisms and relocation show that the strike of the fault plane is about 125° （WNW-ESE）, and the mainshock is left-laterally strikeslip. The parameters of shear-wave splitting were obtained at seismic stations of YUS and L6304 by systematic analysis method of shear-wave splitting （SAM） method. Based on the parameters of shear-wave splitting and focal mechanism, the characteristics of stress field in seismic source zone were analyzed. The directions of polarization at stations YUS and L6304 are different. It is concluded that after the mainshock and the Ms6.3 aftershock on April 14, the stress-field was changed.

关键词： Yushu earthquake double difference algorithm focal mechanism shear-wave splitting stress

Shear-wave splitting in the crust:Regional compressive stress from polarizations of fast shear-waves

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Earthquake Science 2012年第1期25卷 35-45页

作者： Yuan Gao yutao shi Jing Wu Lingxue Tai Institute of Earthquake Science China Earthquake AdministrationBeijing 100036China Institute of Geology and Geophysics Chinese Academy of SciencesBeijing 100029China

When propagating through anisotropic rocks in the crust, shear-waves split into faster and slower components with almost orthogonal polarizations. For nearly vertical propagation the polarization of fast shear- wave （PFS） is parallel to both the strike of the cracks and the direction of maximum horizontal stress, therefore it is possible to use PFS to study stress in the crust. This study discusses several examples in which PFS is applied to deduce the compressive stress in North China, Longmenshan fault zone of east edge of Tibetan plateau and Yunnan zone of southeast edge of Tibetan plateau, also discusses temporal variations of PFS orientations of 1999 Xiuyan earthquake sequences of northeastern China. The results are consistent to those of other independent traditional stress measurements. There is a bridge between crustal PFS and the crustal principal compressive stress although there are many unclear disturbance sources. This study suggests the PFS results could be used to deduce regional and in situ principal compressive stress in the crust only if there are enough seismic stations and enough data. At least, PFS is a useful choice in the zone where there are a large number of dense seismic stations.

关键词： polarization of fast shear-wave shear-wave splitting compressive stress in the crust seismic anisotropy