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Rupture process of the 2011 Tohoku earthquake from the joint inversion of teleseismic and gps data

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Earthquake Science 2012年第2期25卷 129-135页

作者： Yong Zhang Lisheng Xu Yun-tai Chen Institute of Geophysics China Earthquake AdministrationBeijing 100081China

Teleseismic and gps data were jointly inverted for the rupture process of the 2011 Tohoku earthquake. The inversion results show that it is a bilateral rupture event with an average rupture velocity less than 2.0 km/s along the fault strike direction. The source rupture process consists of three sub-events, the first oc- curred near the hypocenter and the rest two ruptured along the up-dip direction and broke the sea bed, causing a maximum slip of about 30 m. The large-scale sea bed breakage may account for the tremendous tsunami disaster which resulted in most of the death and missing in this mega earthquake.

关键词： 2011 Tohoku earthquake rupture process joint inversion teleseismic data gps data

Source of the 2019 M_(W)6.9 Banten Intraslab earthquake modelled with gps data inversion

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Geodesy and Geodynamics 2021年第4期12卷 308-314页

作者： Satrio Muhammad Alif Erlangga Ibrahim Fattah Munawar Kholil Ongky Anggara Geomatics Engineering Institut Teknologi SumateraIndonesia Geophysics Engineering Institut Teknologi SumateraIndonesia Geospatial Information Agency Indonesia

The 2019 M_(W)6.9 Banten Intraslab earthquake occurred at~100 km to the northeast of the Sunda Trench with two nodal plane models estimated by the Global Centroid-Moment-Tensor(GCMT)Project with a strike of 200°and a dip of 65°.Continuous gps data from 11 gps sites were used to model the source of the earthquake in *** coseismic displacements and its uncertainties are obtained from the coordinates of these gps sites from 7 days before to 7 days after the *** coseismic slip is the inversion result of those displacements based on the best fit in an elastic *** maximum displacement is~5 cm with a large uncertainty that is comparable to the amplitude of displacement.A seismic moment of the best model(strike of 65°and dip of 54°)is 2.79×10^(19) Nm or equivalent to M_(W)*** fault model of the earthquake is highly presumed as a continuation of Sumatran Fault Zone.

关键词： Coseismic slip Intraslab earthquake gps data Sunda strait Stress transfer

A Survey of Sediment Fineness and Moisture Content in the Soyang Lake Floodplain Using gps data

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Engineering 2021年第2期7卷 252-259页

作者： Mutiara Syifa Prima Riza Kadavi Sung Jae Park Chang-Wook Lee Division of Science Education Kangwon National UniversityGangwon-do 24341Republic of Korea

Soyang Lake is the largest lake in Republic of Korea bordering Chuncheon,Yanggu,and Inje in Gangwon *** is widely used as an environmental resource for hydropower,flood control,and water ***,we conducted a survey of the floodplain of Soyang Lake to analyze the sediments in the *** used global positioning system(gps)data and aerial photography to monitor sediment deposits in the Soyang Lake *** from three gps units were compared to determine the accuracy of sampling location *** samples were collected at three sites:two in the eastern region of the floodplain and one in the western region.A total of eight samples were collected:Three samples were collected at 10 cm intervals to a depth of 30 cm from each site of the eastern sampling point,and two samples were collected at depths of 10 and 30 cm at the western sampling *** were collected and analyzed for vertical and horizontal trends in particle size and moisture *** sizes of the sediment samples ranged from coarse to very coarse sediments with a negative slope,which indicate eastward movement from the *** probability of a breach was indicated by the high water content at the eastern side of the floodplain,with the eastern sites showing a higher probability than the western *** results of this study indicate that analyses of grain fineness,moisture content,sediment deposits,and sediment removal rates can be used to understand and predict the direction of breach movement and sediment distribution in Soyang Lake.

关键词： Soyang Lake Grain fineness number Moisture content gps data Digital surface model

Co-seismic Slip Distribution of the 2001 Kokoxili Earthquake Inverted by the gps data

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Earthquake Research in China 2005年第4期19卷 420-429页

作者： Wan Yongge Shen Zhengkang He Zhende Wang Min Chen Jie Zhang Zusheng Wang Qingliang Gan Weijun Institute of Geology China Earthquake Administration Beijing 100029 China College of Disaster Prevention Techniques CEA Yanjiao East of Beijing 101601 China Institute of Earthquake Prediction China Earthquake Administration Beijing 100036 China Department of Earth and Space Sciences University of California Los Angeles CA 90095-1567 USA First Monitoring Center China Earthquake Administration Tianjin 300180 China Second Monitoring Center CSB Xi＇ an 710054 China

The authors analyze co_seismic displacement field derived from the Global Position System (gps) observations collected before and after the 2001 Kokoxili earthquake, western China. Using the co_seismic displacement data, and constrained with surface rupture data, they invert co_seismic slip distribution along the seismic fault. Their result shows that the earthquake ruptured the upper crust down to a depth of 13.1～22km (at 70% certainty), with its optimal estimate at 16.5km. A 2～3m left_lateral strike slip is resolved between the Sun Lake segment and the west end of the main rupture zone, although surface rupture has not been observed there. The surface rupture of this earthquake is ended at the Sun Lake to the west, but left_lateral slip of 1.5～2.0m seems to exist beyond the east end of surface rupture observed from field geology. Seismic moment release estimated using gps and surface rupture measurement is 6.0×10 20 N·m, which is in good agreement with the result obtained from seismic wave inversion.

关键词： the Kokoxili earthquake Co-seismic slip distribution gps data Inversion

Dynamic Queue Length Estimation Using gps and Lpr data

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Dynamic Queue Length Estimation Using Gps and Lpr Data

作者： MUHAMMAD YASIR 东南大学

学位级别：硕士

Real-time and accurate queue length information is very imperative in evaluating the performance and to develop adequate queue management systems,especially under the congested condition in an advanced traffic control *** intelligent mobility technologies such as automatic number plate recognition systems and automatic vehicle identification systems for queue length estimation,have received tremendous attention due to their active deployments in recent years.A machine learning algorithm based real-time dynamic queue length estimation was proposed using the gps and license plate recognition（LPR）*** to the former shock-fitting methods,the proposed method is fully data-driven,robust,and no need for any prior knowledge or assumptions about the shockwave *** this research project,the stop locations of vehicles and 18 representative features of traffic flow characteristics around the vehicles were extracted from gps and LPR data respectively for the training of the machine learning algorithm *** that,a feature selection has been carried out through extracted features with the help of different feature selection techniques to remove irrelevant or redundant features,which could be harmful or at least have no contribution to the accuracy of the *** on the best-selected features,a Random Forest and Support Vector Regression model had been trained,and then a trained model was used to predict the stop locations of vehicles using the LPR data as *** cyclic lane-based maximum dynamic queue lengths were estimated based on the predicted stop *** proposed method was implemented for thirty-nine lanes in Kunshan city,P.R *** findings and conclusion include:（1）By the feature selection process,the travel time in control delay feature categories had the most significant impacts on the prediction accuracy of the Random Forests *** travel time of the leading vehicle as well as travel time of the labeled vehicle was stro

关键词： traffic management queue length estimation gps data LPR data

GBO algorithm for seismic source parameters inversion

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Geodesy and Geodynamics 2023年第2期14卷 182-190页

作者： Leyang Wang Han Li Faculty of Geomatics East China University of TechnologyNanchang 330013China Key Laboratory of Mine Environmental Monitoring and Improving Around Poyang Lake Ministry of Natural ResourcesNanchang 330013China

The use of geodetic observation data for seismic fault parameters inversion is the research hotspot of geodetic inversion, and it is also the focus of studying the mechanism of earthquake occurrence. Seismic fault parameters inversion has nonlinear characteristics, and the gradient-based optimizer(GBO) has the characteristics of fast convergence speed and falling into local optimum hardly. This paper applies GBO algorithm to simulated earthquakes and real LuShan earthquakes in the nonlinear inversion of the Okada model to obtain the source parameters. The simulated earthquake experiment results show that the algorithm is stable, and the seismic source parameters obtained by GBO are slightly closer to the true value than the multi peak particle swarm optimization(MPSO). In the 2013 LuShan earthquake experiment, the root mean square error between the deformation after forwarding of fault parameters obtained by the introduced GBO algorithm and the surface observation deformation was 3.703 mm, slightly better than 3.708 mm calculated by the MPSO. Moreover, the inversion result of GBO algorithm is better than MPSO algorithm in stability. The above results show that the introduced GBO algorithm has a certain practical application value in seismic fault source parameters inversion.

关键词： Fault source parameters inversion Gradient-based optimizer algorithm Nonlinear Multi-peak particle swarm optimization algorithm gps data

Diverse experiences by active travel for carbon neutrality:A longitudinal study of residential context,daily travel and experience types

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Geography and Sustainability 2024年第3期5卷 459-469页

作者： Karl Samuelsson S.Anders Brandt Stephan Barthel Noah Linder Nancy Joy Lim David Hallman Matteo Giusti Department of Building Engineering Energy Systems and Sustainability ScienceFaculty of Engineering and Sustainable DevelopmentUniversity of Gävle 80176 GävleSweden ISGlobal Barcelona Biomedical Research ParkDoctor Aiguader 8808003 BarcelonaSpain Department of Computer and Geospatial Sciences Faculty of Engineering and Sustainable DevelopmentUniversity of Gävle 80176 GävleSweden Stockholm Resilience Centre Stockholm University 10691 StockholmSweden Global Economic Dynamics and the Biosphere Royal Swedish Academy of ScienceLilla Frescativägen 4A 11418 StockholmSweden Department of Occupational Health Science and Psychology Faculty of Health and Occupational StudiesUniversity of Gävle 80176 GävleSweden School of Sustainability Civil and Environmental EngineeringFaculty of Engineering and Physical SciencesUniversity of SurreyGuildfordSurrey GU27XHUK

Two key goals for sustainable spatial planning are to promote low-carbon travel in daily life and to enhance human wellbeing through diverse human-environment ***,the integration of these goals has been *** study investigates the potential for experiential diversity via active travel in different resi-dential contexts within the Gävle city-region,*** 15 months,we collected spatiotemporal data from 165 participants,analyzing 4,362 reported experiences and 13,192 gps-derived travel *** analysis uncovered a significant spatial discrepancy:while the travelled distances to locations of positive experiences typ-ically ranged from 1.5 km to 5 km,active travel predominated only within 1.5 *** discrepancy persisted across urban,suburban,and peripheral *** residents in different contexts reported the same types of experiences,urban dwellers travelled about 50%farther for nature experiences compared with other positive experiences,whereas peripheral dwellers travelled twice the distance for urbanicity experiences compared with other positive ***,urban residents mostly relied on active travel for urbanicity experiences and motorised travel for nature experiences,with the reverse trend observed among peripheral *** results illustrate the importance of spatial scale for promoting diverse positive experiences via active travel,re-gardless of residential *** planning strategies may include enhancing environmental diversity near homes and developing infrastructure that favours active over motorised travel for short to moderate distances.

关键词： Walking Biking Experiential diversity gps data Smartphone app Topodiversity

Numerical Simulation of Annual Change Patterns of Contemporary Tectonic Stress-Strain Field of the Chinese Mainland

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Earthquake Research in China 2006年第2期20卷 127-137页

作者： Chen Lianwang Yang Shuxin Xie Furen Lu Yuanzhong Guo Ruomei Institute of Crustal Dynamics China Earthquake Administration Beijing 100085 China Institute of Geology China Earthquake Administration Beijing 100029 China

Based on the active crustal block structures, the Holocene active faults and the wave velocity structures with a resolution of 1°×1°, a two-dimensional finite element model for the tectonic stress-strain field of the Chinese mainland is constructed in the paper. Using gps measurements, the velocity boundary conditions for the model are deduced, then, the annual change patterns of the present-day stress-strain field of the Chinese mainland are simulated. The results show that (1) the general pattern of the recent tectonic deformation in the Chinese mainland is governed by the interactions of its surrounding plates, of which, the Indian Plate plays a major role. There is a NNE-directed velocity distribution in the west of the Chinese mainland. The maximum slip rate appears at the collision boundary. The north-directed components decrease, while the east-directed components increase gradually from south to north and from west to east. In the east part, there is a general east-directed movement, with a certain amount of south-directed components. (2) The present-day tectonic stress field in the Chinese mainland has undergone the process of enhancement in recent years, and this process presents a general pattern of radiating eastwards from the Qinghai-Xizang (Tibet) Plateau as the center. The general pattern is similar to the ambient tectonic stress field, indicating the inheritance of contemporary tectonic deformation on the Chinese mainland. (3) The maximum principal strain presents an obvious pattern of being high in the west and low in the east. The tectonic movement in the west is stronger than that in the east. Large active faults are all located in the high-value zones of maximum principal strain. However, the magnitude of strain is smaller in the interior of the active crustal blocks, which are enclosed by these faults. (4) The stress-strain field of the Sichuan-Yunnan region is unique. It may not be governed by collision of plates alone but a combination of the

关键词： Chinese mainland Tectonic stress-strain field gps data Numerical simulation Annual change