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Modeling of Geodynamic Processes

#2818


New Mathematical Methods and Software for Geophysical Applications

Tech Area / Field

  • INF-COM/High Performance Computing and Networking/Information and Communications
  • OBS-NAT/Natural Resources and Earth Sciences/Other Basic Sciences
  • PHY-SSP/Solid State Physics/Physics
  • SAT-AER/Aeronautics/Space, Aircraft and Surface Transportation

Status
3 Approved without Funding

Registration date
10.07.2003

Leading Institute
Research Institute of Aviation Systems, Russia, Moscow

Supporting institutes

  • Institute of Physics of the Earth, Russia, Moscow

Collaborators

  • Institut de Physique du Globe, France, Paris\nUniversity of South Carolina, USA, SC, Columbia\nCODATA, France, Paris

Project summary

The aim of the project is to create a fundamentally novel computational complex, UWay, designed for numerical-analytical modeling of geodynamic processes and the stressed state of the lithosphere, including in earthquake’s foci. UWay will be based on the fundamentally novel results in the fields of mathematics, mechanics and tectonophysics obtained by the participants of ISTC project #1536 (2000-2003). The fulfillment of the tasks formulated herein will help achieve a significant progress in the development of methods of numerical state of stress assessments and, as a consequence, methods of seismic hazard assessment.

Characteristic feature of UWay is a new approach to describing deformational properties of the lithosphere. The most important feature of the lithosphere’s brittle part, which is responsible for earthquake occurrence, is the fractured state of rock massifs. However, existing earthquake foci models and earthquake prediction methods thereof are based on the assumption that there is a solid and homogeneous medium which is destroyed in the moment of earthquake by a single crack. These models do not allow for the medium’s microstructure while describing pre-earthquake processes. Many researchers pointed to that the lithosphere’s multi-layered structure in the vicinity of earthquake focus needs to be taken into account (Tsuboi C., Kasahara K., Sadovsky M.), but not a single one adequate mathematical model of such medium has been created to this day. Theoretical results obtained in the course of fulfillment of ISTC Project #1536 created the basis for approaching the task of creating such a model. The software being developed will involve the creation of a rheological model which will be based on a joint analysis of a large number of geophysical and geological data and will take these structural peculiarities of the Earth’s crust and lithosphere into account.

Distinguishing feature of the project is that its objective is not only in study of general regularities of geodynamic processes, but also in detailed numerical modeling of evolution and present state of stress of several real tectonic structures. For it new, more detailed, geodynamic models of specific structures will be developed, including the Greater Caucasus and For-Caucasus foredeep, Baikal rift zone and the subduction zones in the northwestern part of the Pacific Ocean. These models should take into account all available geological and geophysical data on the structure and development of these structures. The fulfillment of this work will require development of new methods of joint interpretation of different geological and geophysical data, including approaches based on the use of the artificial intelligence and fuzzy logic, as well as considerable improvement of methods of mathematical modeling of geodynamic processes. Such methodology was tested in the course of the ISTC #1536 project, and in this project it will be developed and expanded by adding the methodology of reconstructing stress fields at specific locations from earthquake foci mechanism data, which was developed in the ISTC #1536 project.

Work on the creation of the UWay computational complex based on the method of finite elements was started in the course of the ISTC #1536 project. UWay will utilize the very latest achievements in the field of computational methods and programming.


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The International Science and Technology Center (ISTC) is an intergovernmental organization connecting scientists from Kazakhstan, Armenia, Tajikistan, Kyrgyzstan, and Georgia with their peers and research organizations in the EU, Japan, Republic of Korea, Norway and the United States.

 

ISTC facilitates international science projects and assists the global scientific and business community to source and engage with CIS and Georgian institutes that develop or possess an excellence of scientific know-how.

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