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Newmark displacement model for landslides induced by the 2013 Ms 7.0 Lushan earthquake, China

Frontiers of Earth Science 2016年第4期10卷 740-750页

作者： Renmao YUAN Qinghai DENG dickson cunningham Zhujun HAN Dongli ZHANG Bingliang ZHANG Key Laboratory of Active Tectonics and Volcano Institute of Geology China Earthquake Administration Beijing 100029 China College of Earth Science and Engineering Shandong University of Science and Technology Qingdao 266590 China Department of Environmental Earth Science Eastern Connecticut State University Connecticut 06226 USA

Predicting approximate earthquake-induced landslide displacements is helpful for assessing earthquake hazards and designing slopes to withstand future earth- quake shaking. In this work, the basic methodology outlined by Jibson （1993） is applied to derive the Newmark displacement of landslides based on strong ground-motion recordings during the 2013 Lushan Ms 7.0 earthquake. By analyzing the relationships between Arias intensity, New- mark displacement, and critical acceleration of the Lushan earthquake, formulas of the Jibson93 and its modified models are shown to be applicable to the Lushan earthquake dataset. Different empirical equations with new fitting coefficients for estimating Newmark displace- ment are then developed for comparative analysis. The results indicate that a modified model has a better goodness of fit and a smaller estimation error for the Jibson93 formula. It indicates that the modified model may be more reasonable for the dataset of the Lushan earthquake. The analysis of results also suggests that a global equation is not ideally suited to directly estimate the Newmark displacements of landslides induced by one specific earthquake. Rather it is empirically better to perform a new multivariate regression analysis to derive new coefficients for the global equation using the dataset of the specific earthquake. The results presented in this paper can be applied to a future co-seismic landslide hazard assessment to inform reconstruction efforts in the area affected by the 2013 Lushan Ms 7.0 earthquake, and for future disaster prevention and mitigation.

关键词： Newmark displacement of landslide Ariasintensity critical acceleration empirical relationship theLushan Ms 7.0 earthquake

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Triassic to Cenozoic multi-stage intra-plate deformation focused near the Bogd Fault system,Gobi Altai,Mongolia

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Geoscience Frontiers 2015年第5期6卷 723-740页

作者： Douwe J.J.van Hinsbergen dickson cunningham Gijsbert B.Straathof Morgan Ganerod Bart W.H.Hendriks Arjan H.Dijkstra Department of Earth Sciences Utrecht University Department of Environmental Earth Science.Eastern Connecticut State University SGS Horizon B.V. Stationsplein 6.2270 JB VoorburgThe Netherlands Geological Survey of Norway.Center of Geodynamics Statoil ASA.Rotvoll Norway School of Geography.Earth and Environmental Sciences.Plymouth University

The Gobi Altai region of southern Mongolia has been in the Eurasian plate interior since the midMesozoic,yet has experienced episodic phases of deformation since that *** this paper,we document field evidence to characterize and date the intra-plate tectonic history of the Gobi Altai region from the Triassic to the *** this end,we provide detailed mapping of the structure and stratigraphy of the eastern flanks of *** Bogd that contains the widest variety of rock-time units in the *** carry out geochronological analysis of basaltic lavas and basement granite in the *** demonstrate that a crystalline basement with a 502 ± 8 Ma granitoid（U/Pb） underwent two phases of basin formation in the *** we date with new40Ar/39Ar lava ages of 218.5 ± 1.5,123.2 ± 0.7 and 124.8 ± 1.2 Ma,*** phases are linked to deposition of fluvio-lacustrine sediments and trap-like basaltic volcanics,with cumulative thicknesses of 1000-1500 *** basins were likely north-facing half-grabens that developed underN-S extension,but were subsequently overthrusted by Paleozoic and older crystalline basement during a less well constrained,but likely mid-Cretaceous phase of N-S shortening and basin *** results are consistent with recent seismic imaging of rift basins100 km to the NE of the study area where a similar history was *** multiple phases of intra-plate deformation appear to have parallel structural trends,most likely due to reactivated Paleozoic basement structures created during the original terrane amalgamation of the Central Asian Orogenic Belt continental *** strong basement heterogeneity may predispose it to reactivation,and make it sensitive to changes in the overall stress field of the Eurasian plate driven by forces at its margins and *** study of Mongolia’s multi-stage tectonic history may thus provide a key proxy for the long-term dynamics of the Eurasian *** addition,the repeated reactivation

关键词： Ar/Ar geochronology Intra-plate deformation U/Pb geochronology Compression Extension

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Vertical shaft collapse at the Jinchuan Nickel Mine,Gansu Province,China:analysis of contributing factors and causal mechanisms

Vertical shaft collapse at the Jinchuan Nickel Mine,Gansu Pr...

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中国科学院地质与地球物理研究所2013年度（第13届）学术年会

作者： Feng-shan Ma Qing-hai Deng dickson cunningham Ren-mao Yuan Hai-jun Zhao Institute of Geology and Geophysics Chinese Academy of Sciences College of Geological Science and Engineering Shandong University of Science and Technology College of Resources and Environment Science Chongqing University Department of Earth and Environmental Sciences Eastern Connecticut State University Key Laboratory of Active Tectonics and Volcano China Earthquake Administration Institute of Geology China Earthquake Administration

In mining areas,vertical ventilating shafts are often threatened by ground movements induced by underground *** this paper,damage characteristics related to collapse of the vertical ventilating shaft at the No.14 exploratory line in Jinchuan Nickel Mine,China are documented. The damage mechanism is then analyzed based on comprehensive consideration of geological conditions and distribution of underground *** results indicate that the high dip angle of the ore body and fault/ fissures were responsible for the damage of the shaft when ground movements *** the damaged shaft was repaired in a short time,its stability and safe usage are still threatened by potential future ground movements, because the shaft is located within a subsiding depression induced by underground *** case study indicates that when designing an underground mining operation,it is very important to locate a shaft outside of any area where future mining-induced subsidence may occur.

关键词： Shaft collapse Vertical ventilating shaft Underground mining Jinchuan Nickel Mine China

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