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GeoRef Categories
Era and Period
Epoch and Age
Book Series
Date
Availability
reliability
Rock joint detection from 3D point clouds based on colour space
Lugeon test: new insights into calculated hydraulic conductivity
Evaluation of Observationally Based Models through Salience and Salience Maps
A mixed-mode data collection approach for building inventory development: Application to school buildings in Central Sulawesi, Indonesia
Novel approach to predicting the spatial distribution of the hydraulic conductivity of a rock mass using convolutional neural networks
Evaluation of the Event Detection Level of the Cuban Seismic Network
Abstract In this study, we collect and translate observations and witness accounts suggestive of volcanic eruptions in ancient and modern China. The documents from the literature covered confirmed volcanic eruptions and suspected volcanic events. Recorded events concerning Tianchi ( c. 946 AD), Wudalianchi (1720, 1721) and Ashikule (1951) volcanoes relate to confirmed volcanic eruptions. Detailed records of Tianchi eruptions in historical documents span from 946 to 1903 AD. The real-time observations of the 1720–21 eruptions recorded by the government are presented. They describe a violent explosion and the development of lava flows at Laoheishan volcano. Evidence for events suggestive of volcanic activity are also presented for Dayingshan (1609, Tengchong), Man'anling (1883, Haikou), Chahayan (Heilongjiang), the South China Sea, Kui-shan Tao (late 1770s, Taiwan) and Penjia Islet (19 May 1916 and 29 June 1927, Taiwan). However, some supposed historical volcanic activities including Helanshan (Ningxia), Datong volcano, Rendagou (Sichuan) and Shizishan (Hunan) remain highly suspect according to their unclear positions and rough geological settings. These events may arise from the spontaneous combustion of coal. Records in Tianshan and Beiting Beishan (Xinjiang) may represent mud volcanoes. One case of an ancient Chinese Fengshui master interpreting geological processes from mythology is helpful when inspecting volcanology-related myths.
Geological influence on the index properties variability and shear strength probability density functions
Optimal Transceiver Distance of Controlled-source Audio-frequency Magnetotelluric Sounding Method
Estimating lifeline resilience factors using post-disaster business recovery data
Seismic Design Method for Reliability-Based Rehabilitation of Buildings
Assessment of Vulnerability of Rock Slope Considering Material and Seismic Variability
Stochastic geometry model of rock mass fracture network in tunnels
On the reliability of experimental data in the geomechanical characterization of dimension stones
Results of inversion of distorted magnetotelluric sounding curves ( numerical experiment )
Late Pennsylvanian–Early Triassic conchostracan biostratigraphy: a preliminary approach
Abstract: Conchostracans are one of the most common fossil animal groups of continental deposits from late Palaeozoic to modern times. Their habitats have ranged from perennial lakes of the Carboniferous and Early Permian to seasonal playa lakes and temporary ponds from the late Early Permian into the Triassic, where they could form mass occurrences. This, together with relatively high speciation rates, makes them ideal guide fossils, especially in otherwise fossil-poor wet and dry red beds. Based on material and data collected since the 1980s from both surface outcrops and well cores in central Europe, a preliminary conchostracan zonation is proposed. We used a conservative approach, erecting assemblage zones comprising two or three species instead of species-range zones with only one or, sometimes, two forms. Assemblage zones are more robust and provide more reliability for each delineated time interval. Isotopically dated occurrences of conchostracan zone species, or co-occurrences of conchostracans, insect zone species and marine index fossils such as conodonts and fusulinids, allow us to correlate our assemblage zones with the marine Standard Global Chronostratigraphic Scale.
Using resistivity or logarithm of resistivity to calculate depth of investigation index to assess reliability of electrical resistivity tomography
Abstract DOWNFLOW is a probabilistic code for the simulation of the area covered by lava flows. This code has been used extensively for several basaltic volcanoes in the last decade, and a review of some applications is presented. DOWNFLOW is based on the simple principle that a lava flow tends to follow the steepest descent path downhill from the vent. DOWNFLOW computes the area possibly inundated by lava flows by deriving a number, N , of steepest descent paths, each path being calculated over a randomly perturbed topography. The perturbation is applied at each point of the topography, and ranges within the interval ±Δ h . N and Δ h are the two basic parameters of the code. The expected flow length is constrained by statistical weighting based on the past activity of the volcano. The strength of the code is that: (i) only limited volcanological knowledge is necessary to apply the code at a given volcano; (ii) there are only two (easily tunable) input parameters; and (iii) computational requirements are very low. However, DOWNFLOW does not provide the progression of the lava emplacement over time. The use of DOWNFLOW is ideal when a large number of simulations are necessary: for example, to compile maps for hazard and risk-assessment purposes.
Abstract The MAGFLOW model for lava-flow simulations is based on the cellular automaton (CA) approach, and uses a physical model for the thermal and rheological evolution of the flowing lava. We discuss the potential of MAGFLOW to improve our understanding of the dynamics of lava-flow emplacement and our ability to assess lava-flow hazards. Sensitivity analysis of the input parameters controlling the evolution function of the automaton demonstrates that water content and solidus temperatures are the parameters to which MAGFLOW is most sensitive. Additional tests also indicate that temporal changes in effusion rate strongly influence the accuracy of the predictive modelling of lava-flow paths. The parallel implementation of MAGFLOW on graphic processing units (GPUs) can achieve speed-ups of two orders of magnitude relative to the corresponding serial implementation, providing a lava-flow simulation spanning several days of eruption in just a few minutes. We describe and demonstrate the operation of MAGFLOW using two case studies from Mt Etna: one is a reconstruction of the detailed chronology of the lava-flow emplacement during the 2006 flank eruption; and the other is the production of the lava-flow hazard map of the persistent eruptive activity at the summit craters.
Abstract Prediction of the emplacement of volcanic mass flows (lava flows, pyroclastic density currents, debris avalanches and debris flows) is required for hazard and risk assessment, and for the planning of risk-mitigation measures. Numerical computer-based models now exist that are capable of approximating the motion of a given volume of volcanic material from its source to the deposition area. With these advances in technology, it is useful to compare the various codes in order to evaluate their respective suitability for real-time forecasting, risk preparedness and post-eruptive response. A ‘benchmark’ compares codes or methods, all aimed at simulating the same physical process using common initial and boundary conditions and outputs, but using different physical formulations, mathematical approaches and numerical techniques. We set up the basis for a future general benchmarking exercise on volcanic mass-flow models and, more specifically, establish a benchmark series for computational lava-flow modelling. We describe a set of benchmarks in this paper, and present a few sample results to demonstrate output analysis and code evaluation methodologies. The associated web-based communal facility for sharing test scenarios and results is also described.