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  • 1
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    Nonlinear dynamic modeling of earthquake prediction (1994)
    American Geophysical Union
    In:  Bull., Open-File Rept., Nonlinear Dynamics and Predictability of Geophysical Phenomena, Washington, American Geophysical Union, vol. 5, no. 16, pp. 81-89, (ISBN 1-86239-165-3, vi + 330 pp.)
    Details
    Publication Date: 1994
    Keywords: Modelling ; Earthquake precursor: prediction research ; Earthquake precursor: models ; Chaotic behaviour
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    Three‐dimensional inversion of full magnetic gradient tensor data based on hybrid regularization method (2018)
    Wiley
    Details
    Publication Date: 2018
    Description: ABSTRACT Rapid developments in SQUID‐based technology make it possible for geophysical exploration to direct measure, inverse and interpret magnetic gradient tensor data. This contribution introduces a novel three‐dimensional hybrid regularization method for inversion of magnetic gradient tensor data, which is based on the minimum support functional and total variation functional. Compared to the existing stabilizers, for example, the minimum support stabilizer, the minimum gradient support stabilizer or the total variation stabilizer, our proposed hybrid stabilizer, in association with boundary penalization, improves the revision result greatly, including higher spatial and depth resolution, more clear boundaries, more highlighted images and more evident structure depiction. Moreover, suitable selection of model parameter λ will further improve the image quality of the recovered model. We verify our proposed hybrid method with various synthetic magnetic models. Experiment results prove that this method gives more accurate results, exhibiting advantages of less computational costs even when less prior information of magnetic sources are provided. Comparison of results with different types of magnetic data with and without remanence indicates that our inversion algorithm can obtain more detailed information on the source structure based on rational estimation of total magnetization direction. Finally, we present a case study for inverting SQUID‐based magnetic tensor data acquired at Da Hinggan Mountains area, inner Mongolia, China. The result also certifies that the method is reliable and efficient for real cases.
    Print ISSN: 0016-8025
    Electronic ISSN: 1365-2478
    Topics: Geosciences , Physics
    Published by Wiley
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  • 3
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    Dynamics of crustal overthrust versus underthrust in the continental collision zones: Numerical modeling (2019)
    Wiley
    Details
    Publication Date: 2019
    Description: Abstract Trans‐plate crustal overthrust and underthrust are two unusual crustal architectures in nature, the mechanisms of which remain debated. Here, we construct a series of 2D numerical models to investigate the dynamics of trans‐plate crustal overthrust and underthrust. Model results indicate that the favorable conditions of crustal overthrust include low convergence rate, plastically strong crust, rheologically strong upper crust, and hot subducting plate, which meanwhile contribute to the formation of “crocodile” crustal structure. In contrast, a combination of a strong and buoyant subducting plate with a hot overriding plate facilitates crustal underthrust. The development of crustal overthrust shows no correlation with the subduction mode of lithospheric mantle, whereas crustal underthrust normally occurs in an advancing subduction system. Development conditions and crustal structures of the modeled overthrust and underthrust are consistent, on the first order, with the natural Dinarides orogen and the southern Tibetan plateau, respectively. This article is protected by copyright. All rights reserved.
    Print ISSN: 0954-4879
    Electronic ISSN: 1365-3121
    Topics: Geosciences
    Published by Wiley
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  • 4
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    Gravity inversion using the frequency characteristics of the density distribution (2008)
    Springer
    Details
    Publication Date: 2008-06-01
    Print ISSN: 1672-7975
    Electronic ISSN: 1993-0658
    Topics: Geosciences , Physics
    Published by Springer
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  • 5
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    Concurrent deformation in the Longmen Shan and the Sichuan Basin: a critical wedge captured by limit analysis (2018)
    Wiley
    In: Tectonics
    Details
    Publication Date: 2018-01-09
    Description: The southern Longmen Shan region has seismically active faults in its western part, the Beichuan fault (BCF) and the Pengguan fault (PGF), both rooting on a deep décollement, and has flat topography in its eastern part which marks the current deformation front due to thrusting from a shallow décollement. The concurrent faulting at the rear and at the front is separated by the flat Sichuan Basin. The objective of this contribution is to propose a mechanical approach based on the limit analysis theory to estimate the frictional properties which could explain how this heterogeneous wedge could be critical in the sense that faulting occurs at various places concurrently. A simple prototype with bilinear topography is first proposed to construct analytical solutions. The activations of the BCF, the PGF and of the upper décollement up to the deformation front are examples of collapse mechanisms captured analytically by the limit analysis. Deformation maps are constructed, in the space of the friction angles of the upper and lower décollements, identifying the domain of activation of the various collapse mechanisms. The critical conditions in terms of friction angles for the concomitant activation of these various collapse mechanisms are established. A more realistic prototype is then analyzed with the numerical code OptumG2 which is also based on the limit analysis theory. The deformation maps established for the first prototype are then applied to evaluate the critical conditions of the complex prototype with a limited number of numerical simulations.
    Print ISSN: 0278-7407
    Electronic ISSN: 1944-9194
    Topics: Geosciences
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 6
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    The mechanism and dynamics of N-S rifting in southern Tibet: Insight from 3-D thermomechanical modeling (2018)
    Wiley
    Details
    Publication Date: 2018-01-11
    Description: N–S trending rifts are widely distributed in southern Tibet, suggesting that this region is under E–W extension, behind the N–S collision between the Eurasia and India plates. Geophysical anomalies and Miocene magma extrusions indicate the presence of dispersed weak zones in the mid-lower crust in southern Tibet. These weak zones are partially located underneath the N–S rifting systems. In order to study the formation of rifts in collision zones, we have developed a high-resolution 3-D thermomechanical model of continental lithosphere with bi-directional compressional-extensional deformation, and spatially localized weak and low-density zones in the mid-lower crust. Our numerical experiments systematically reproduce the development of N–S trending rifts. Model results reveal that the weak mid-lower crust triggers the development of normal faults in the upper crust and surface uplift, whereas regions without such weak layer, or with small-scale weak zones, are characterized by strike-slip faulting. Geodynamic properties (density, depth and geometry) of the weak mid-lower crust and Moho temperature notably influence the rifting pattern. In addition, rifting formation is critically controlled by large E–W extension, with the ratio of extensional to compressional strain rate larger than 1.5 in the model with continuous weak middle crust. Our simulated rifting patterns correlate well with the observations in southern Tibet; we conclude that a combination of the bi-directional compression-extension and the presence of locally weak mid-lower crust triggered the development of the rifting systems in southern Tibet.
    Print ISSN: 0148-0227
    Topics: Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 7
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    Numerical simulation of pore pressure and ground water level variation in earthquake preparation (in Chinese) (1994)
    Elsevier
    Details
    Publication Date: 1994-12-01
    Print ISSN: 0148-9062
    Topics: Geosciences
    Published by Elsevier
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  • 8
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    Numerical simulation of complexity of earthquake precursors (in Chinese) (1994)
    Elsevier
    Details
    Publication Date: 1994-12-01
    Print ISSN: 0148-9062
    Topics: Geosciences
    Published by Elsevier
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  • 9
    Electronic Resource
    Electronic Resource
    Thermal modeling of the Southern Alps, New Zealand (1996)
    Springer
    Pure and applied geophysics 146 (1996), S. 469-501 
    Details
    ISSN: 1420-9136
    Keywords: Thermal modeling ; Southern Alps ; fission track age
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Finite-element modeling of the thermal regime across the Southern Alps of New Zealand has been carried out along two profiles situated near the Franz Josef and Haast valleys. The modeling involves viscous deformation beneath the Southern Alps, including both uplift and erosion, and crustal/lithospheric thickening, as a result of crustal shortening extending to 20 mm/y of a 25-km thick crust. Published uplift rates and crustal thickness variations along the two profiles are used to constrain the modeled advection of crustal material, and results are compared with the recent heat flow determinations, 190±50 mW/m2 in the Franz Josef valley and 90±25 mW/m2 in the Haast valley. Comparisons of the model with published K−Ar and fission track ages, show that the observed heat flow in the Franz Josef valley is consistent with observed zircon fission track ages of around 1 Ma, if the present-day uplift rate is close to 10 mm/y. Major thermal differences between the Franz Josef and Haast profiles appear to be due to different uplift and erosion rates. There is weak evidence that frictional heating close to the Alpine fault zone is not significant. The modeling provides explanations for the distribution of seismicity beneath the Southern Alps, and predicts a low surface heat flow over the eastern foothills due to the dominant thermal effect of crustal thickening beneath this region. Predicted temperatures at mid-crustal depth beneath the zone of maximum uplift rate are 50–100°C cooler than those indicated in previously published models, which implies that thermal weakening of the crust may not be the main factor causing the aseismicity of the central Southern Alps. The results of the modeling demonstrate that the different types of reset age data in the region within 25 km of the Alpine fault are critical for constraining models of the deformation and the thermal regime beneath the Southern Alps.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00874730
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    Paper (German National Licenses)
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  • 10
    Electronic Resource
    Electronic Resource
    Thermal structure of the Barbados accretionary complex (1988)
    Springer
    Pure and applied geophysics 128 (1988), S. 749-766 
    Details
    ISSN: 1420-9136
    Keywords: Accretionary complex ; thermal structure ; Barbados
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Finite element modeling of the thermal structure within the Barbados subduction complex is carried out. Kinematics of the sediments inside the complex are computed from a viscous model with inhomogeneous viscosity and the effect of gravity. The model yields an uplift rate compatible with observational data. Advective heat transfer affects the heat flow across the complex. Imbricated thrust faulting further reduces the heat flow across the slope. These mechanisms predict an arcward decrease of heat flow on the lower slope, followed by an increase of heat flow approaching the ridge, little change in heat flow at the forearc basin, and a significant increase of heat flow near the volcanic are, in agreement with the existing observations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00874555
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