Geodynamics the relationship of the Earth's core and crust processes.
                     GEODYNAMICS: THE RELATIONSHIP OF 
THE EARTH’S CORE AND CRUST 
PROCESSES
INTRODUCTION
• Geodynamics is the general term for models of the large-scale behavior of the 
Earth. These are usually defined mathematically and solved by computation, 
although ‘analog’ experiments are possible.
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CRUST PROCESSES
• Full understanding of crustal dynamics requires clarification of stress and 
strength heterogeneities, and rupture heterogeneity. 
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HISTORY
• Historically, in the late nineteenth and early twentieth century, when 
geodynamics was emerging as a distinct field of study, it also included the 
earliest systematic investigations of earthquakes and propagating seismic 
waves.
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ANALYSIS OF HYPOCENTERS 
AND FOCAL MECHANISMS 
• Yukutake and Iio (2017) conducted a precise analysis of hypocenters and focal 
mechanisms of upper crustal aftershocks from the 2000 Mw 6.6 Western 
Tottori, Japan, earthquake which involved predominantly sinistral strike-slip 
along an NNW–SSE fault structure disrupted by a conjugate set of dextral 
cross-faults.
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DEFORMATION
• Deformation occurs in response to stress and/or stress changes, and it reflects 
material properties where the deformation occurs. Thus, it is crucial to measure 
deformation and/or deformation rate in the Japanese Island Arc.
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CRUSTAL FAULT ZONES
• Rheology of large-scale crustal fault zones is essential in the crustal dynamics, 
because it can control deformation in the whole crust in island arcs. 
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IMPORTANCE OF MATERIALS 
SCIENCE
• Materials science of rock deformation is fundamental for not only the crustal 
dynamics but also all the studies in solid earth sciences. Consequently, its 
progress is crucial for our understanding of crustal dynamics. 
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ELASTIC MATRIX MODEL
• Matsumura found that an elastic matrix model is preferable to a Newtonian 
viscous model for analyzing the stresses involved in micro boudinage of 
columnar tourmaline grains within the quartz matrix of the metamorphic 
tectonite.
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LABORATORY MODEL 
• Modeling results are most powerful when the complementary numerical and 
laboratory models are combined. This is the only way to successfully overcome 
the inherent weaknesses of each approach
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