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Lithospheric Equilibrium and Anisotropy around the 2021 Yangbi Ms 6.4 Earthquake in Yunnan,China

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Journal of Earth Science 2023年第4期34卷 1165-1175页

作者： guangyu fu Zhenyu Wang Jingsong Liu Yun Wang Key Laboratory of Intraplate Volcanoes and Earthquakes(China University of Geosciences Beijing)Ministry of EducationBeijing 100083China Institute of Earthquake Forecasting China Earthquake AdministrationBeijing 100036China

Using the gravity/GNSS data of 318 stations observed in 2020,this paper optimizes the Bouguer and free-air gravity anomalies around the 2021 Yangbi Ms 6.4 Earthquake,inverses the lithospheric density structure of the focal area,and obtains the distribution of isostatic additional force borne by the *** results show that the Bouguer gravity anomaly in western Yunnan varies from-120 to-360 m *** a whole the anomalies are large in the north and small in the south,and the value in the source area of the 2021 Yangbi Ms 6.4 Earthquake is about-260 m *** lateral differences indicates that the crust around the great earthquake does not belong to a solid and stable tectonic *** lithosphere in the source area is basically in equilibrium,indicating that the occurrence of the great event is not relative to the lithospheric equilibrium,but to the differential movement of the crust in the horizontal *** addition,we obtain the teleseismic SKS phases of 51 *** a whole,the polarization direction of fast wave in western Yunnan is approximately vertical to the maximum gradient change direction of regional Bouguer gravity anomaly that reflects the change of Moho.

关键词： the 2021 Yangbi Ms 6.4 Earthquake Bouguer gravity anomaly density structure litho-spheric equilibrium shear waves shear wave splitting.

Contemporary crustal tectonic movement in the southern Sichuan-Yunnan block based on dense GPS observation data

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Earth and Planetary Physics 2019年第1期3卷 53-61页

作者： HongLin Jin Yuan Gao XiaoNing Su guangyu fu Key Laboratory of Earthquake Prediction China Earthquake Administration Institute of Earthquake Forecasting China Earthquake Administration

We analyzed 360 permanent and campaign GPS data from 1999 to 2017 in the southern Sichuan-Yunan block, and obtained crustal horizontal deformation in this ***, we derived the strain rate using a multi-scale spherical wavelet *** reveal a complex pattern of tectonic movement in the southern Sichuan-Yunnan *** to the stable Eurasian plate, the maximum rate of the horizontal deformation in the southern Sichuan-Yunnan block is approximately 22 mm/*** Xiaojiang fault shows a significantly lower deformation—a left-lateral strike-slip movement of 9.5 mm/*** Honghe fault clearly shows a complex segmental deformation from the north to *** northern Honghe fault shows 4.3 mm/a right strike-slip with 6.7 mm/a extension; the southern Honghe fault shows 1.9 mm/a right strike-slip with 1.9 mm/a extension; the junction zone in the Honghe and Lijiang–Xiaojinhe faults shows an obvious clockwise-rotation *** strain calculation results reveal that the maximum shear-strain rate in this region reaches 70 nstrain/a, concentrated around the Xiaojiang fault and at the junction of the Honghe and Lijiang–Xiaojinhe *** note that most of the earthquakes with magnitudes of 4 and above that occurred in this region were within the high shear strain-rate zones and the strain rate gradient boundary zone, which indicates that the magnitude of strain accumulation is closely related to the seismic *** of the fast shear-wave polarization direction of the upper-crust with the upper-mantle anisotropy and the direction of the surface principal compressive strain rate obtained from the inversion of the GPS data reveals that the direction of the surface principal compressive strain is basically consistent with the fast shear-wave polarization direction of the upper crust anisotropy, but different from the polarization direction of the upper *** results support the hypothesis that the principal elements of the deformation mecha

关键词： GPS data crustal horizontal deformation extension strike slip strain rate fast shear-wave polarization

Effects of Earth's curvature and radial heterogeneity in dislocation studies:Case studies of the 2008 Wenchuan earthquake and the 2004 Sumatra earthquake

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Earthquake Science 2010年第4期23卷 301-308页

作者： guangyu fu Wenke Sun Yoichi fukuda Shanghua Gao Takashi Hasegawa Institute of Earthquake Science China Earthquake Administration Beijing 100036 China Department of Geophysics Graduate School of Science Kyoto University Kyoto 606-8502 Japan Laboratory of Computational Geoclynamics Graduate University of Chinese Academy of Sciences Beijing 100049 China

Recently, effects of Earth＇s curvature and radial heterogeneity on coseismic deformations are often investi- gated based on the 2004 Sumatra earthquake. However, such effects are strongly related to earthquake types. As a low dip angle event, the 2004 Sumatra earthquake is not a good seismic case for such a topic since the effects for moderate dip angle events are much bigger. In this study, the half-space and spherical dislocation theories are used, respectively, to calculate co- seismic displacements caused by the 2008 Wenchuan earthquake and the 2004 Sumatra earthquake. Effects of Earth＇s curva- ture and stratification are investigated through the discrepancies of results calculated using the two dislocation theories. Re- sults show that the effects of Earth＇s curvature and stratification for the 2008 Wenchuan earthquake are much larger than those for the 2004 Sumatra earthquake. Ignoring the effects will cause errors up to 100%-200% in far field displacements for a moderate dip angle event like the 2008 Wenchuan earthquake. Such great effects are much bigger than those conclusions of previous studies. Besides, comparison with observations verifies that spherical dislocation theories yield better results than half-space ones in far fields.

关键词： coseismic displacement dislocation theory Earth model

Co-seismic Coulomb stress changes on the northern Tanlu fault zone caused by the Tohoku-Oki M_(W)9.0 earthquake

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Earthquake Science 2020年第1期33卷 11-22页

作者： Fei Chen Tai Liu Yawen She Xing Huang guangyu fu Key Laboratory of Earthquake Prediction Institute of Earthquake ForecastingChinese Earthquake AdministrationBeijing 100036China Institute of Geophysics China Earthquake AdministrationBeijing 100081China

Based on the spherical earth dislocation theory and a fault slip model of the Tohoku-Oki M_(W)9.0 earthquake,the co-seismic Coulomb failure stress changes(ΔCFS)on the northern Tanlu fault zone at depths of 0–40 km are *** comparing two sets of results from the spherical earth dislocation theory and the semi-infinite space one,the effect of earth curvature on the calculation results is analyzed ***,we systematically summarize previous researches related to the northern Tanlu fault zone,divide the fault zone as detailed as possible,give the geometric parameters of each segment,and establish a segmented structural model of the northern Tanlu fault ***,we calculate the Coulomb stress changes on the northern Tanlu fault zone by using the spherical earth dislocation *** result shows the Coulomb stress changes are no more than 0.003 MPa,which proves the great earthquake did not significantly change the stress state of the fault ***,we quantitatively analyze the disparities between the results of semi-infinite space dislocation theory and the spherical earth *** average disparity between them is about 7.7%on the northern Tanlu fault zone and is 16.8%on the Fangzheng graben,the maximum disparity on this graben reaches up to 25.5%.It indicates that the effect of earth curvature can not be *** it’s necessary to use the spherical earth dislocation theory instead of the semi-infinite space one to study the Coulomb stress change in the far field.

关键词： the northern Tanlu fault zone segmented structural model spherical earth dislocation theory the Tohoku-Oki M_(W)9.0 earthquake co-seismic Coulomb stress change(△CFS)

Far-field deformations caused by the 2004 Sumatra earthquake

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Geodesy and Geodynamics 2010年第1期1卷 70-78页

作者： guangyu fu Wenke Sun Institute of Earthquake Science China Earthquake Administration Beijing 100036 China Laboratory of Computational Geodynamics Graduate University of Chinese Academy of Sciences Beijing 100049 China

Theoretical horizontal displacements caused by the 2004 Sumatra earthquake in the Sichuan-Yunnan area have been calculated according to a spherical dislocation theory and an earthquake-fault model. The results show that the theoretical displacements are basically consistent with the GPS observations in situ. On this basis,we have calculated the co-seismic displacements, strains, changes of gravity and geoid of the whole Earth, including China mainland and vicinity, caused by this earthquake. Key wards：

关键词： the 2004 Sumatra earthquake dislocation theory displacement strain gravity change far-field deformation

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中国地震重力研究现状及其面临的挑战

武汉大学学报（信息科学版） 2023年第6期48卷 858-869页

作者：付广裕中国地质大学(北京)地球物理与信息技术学院北京100083

高精度重力观测是地震学研究的一个重要手段,近年来在中国地震预测预报工作中发挥了重要作用。首先简要介绍了重力观测仪器的发展现状与分类,然后从重力观测网规模、重力数据处理流程、重力观测结果解释等方面对中日两国的研究现状进行... 详细信息

高精度重力观测是地震学研究的一个重要手段,近年来在中国地震预测预报工作中发挥了重要作用。首先简要介绍了重力观测仪器的发展现状与分类,然后从重力观测网规模、重力数据处理流程、重力观测结果解释等方面对中日两国的研究现状进行了对比,并在此基础上系统分析了中国地震重力观测研究面对的挑战,力争为后续工作提供一些借鉴与启示。

关键词：重力观测重力时变地震预测平差观测误差

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“中国民法典”与不当得利:回顾与前瞻

华东政法大学学报 2019年第1期22卷 116-132页

作者：傅广宇对外经济贸易大学法学院

新中国成立以来的相关立法史表明,不当得利的体系位置始终处于摇摆不定的状态。学界对不当得利的诸多基本问题也同样存在较大争议。立法与理论、理论与司法实践的双重疏离,使得不当得利领域尚未形成较成熟的法教义学。此外,现行民法体... 详细信息

新中国成立以来的相关立法史表明,不当得利的体系位置始终处于摇摆不定的状态。学界对不当得利的诸多基本问题也同样存在较大争议。立法与理论、理论与司法实践的双重疏离,使得不当得利领域尚未形成较成熟的法教义学。此外,现行民法体系中存在数量众多的具有祛除得利功能的规范,它们与形式意义的不当得利规范之间的关系往往不甚清晰。不当得利在未来的民法典中将出现在合同编,这是实用主义立法策略驱动下不得已的选择。以民法典编纂为契机,不当得利规范的体系性和逻辑性有望得到一定程度的提升,但不当得利的基本类型、形式意义的不当得利返还与其他返还请求权之间关系等问题,仍待学说与司法实践的长期努力加以明确。

关键词：中国民法典民法总则不当得利准合同返还请求权

新疆精河6.6级地震周边地区密度构造、均衡异常以及岩石圈挠曲机理

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地球物理学报 2020年第6期63卷 2221-2229页

作者：付广裕王振宇中国地震局地震预测研究所北京100036 中国地震局地球物理研究所北京100081

依据EIGEN-6C4重力模型和ETOPO1高程模型数据,围绕新疆精河6.6级地震展开岩石圈均衡与挠曲机理研究,得到如下结论:(1)震中附近的布格与自由空气重力异常分别为-221和-92mGal(10^-5 m·s^-2),震中位于重力异常高梯度带上;(2)震中周边地... 详细信息

依据EIGEN-6C4重力模型和ETOPO1高程模型数据,围绕新疆精河6.6级地震展开岩石圈均衡与挠曲机理研究,得到如下结论:(1)震中附近的布格与自由空气重力异常分别为-221和-92mGal(10^-5 m·s^-2),震中位于重力异常高梯度带上;(2)震中周边地区地壳厚度约为50km,密度结构总体变化平缓,东西方向地壳厚度变化较小,但自南向北地壳厚度逐渐变薄,精河6.6级地震初始破裂发生在上中地壳分界面附近;(3)震中附近岩石圈承载的垂向构造应力为20MPa左右,震中位于岩石圈垂向构造应力极大值附近的高梯度带上;(4)地震周边地区岩石圈有效弹性厚度最优解为26km,加载比最优解为F1=1,F2=F3=0,表明该区域岩石圈相对坚硬,且导致岩石圈变形的初始加载全部来自地表.

关键词：精河6.6级地震 EIGEN-6C4重力模型布格重力异常岩石圈垂向构造应力场岩石圈有效弹性厚度

Co-seismic strain changes of Wenchuan Mw7.9 earthquake recorded by borehole strainmeters on Tibetan plateau

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Geodesy and Geodynamics 2011年第3期2卷 42-49页

作者： fu guangyu Shen Xuzhang fukuda Yoichi Gao Shanghua Yoshii Satoshi Institute of Earthquake Sciences China Earthquake Administration Beijing 100036 China Key Laboratory of Computational Geodynamics Chinese Academy of Sciences Belting 100049 China Lanzhou Institute of Seismology China Earthquake Administration Lanzhou 730000 China Department of Geophysics Graduate School of Science Kyoto University Kyoto 6068502 Japan

Co-seismic strain changes of the Wenchuan MwT. 9 earthquake recorded with three four-component borehole strainmeters showed NW-SE and roughly EW extensions, respectively, at two locations in the interior and northern part of Tibetan plateau, and NS shortening at a location south of the epicenter, in agreement with the tectonic stress field of this region retical values obtained with half-space effects, such as local crustal structure The observed values of as much as 10-7 are, however, larger than theo- and spherical-earth dislocation theories, implying the existence of other and initial stress.

关键词： Wenchuan MwT. 9 earthquake co-seismic strain changes Tibetan plateau dislocation theory