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Related Concept Videos

Shearing Stress01:19

Shearing Stress

524
Shearing stress, denoted by the Greek letter tau (τ), is stress caused by forces acting transversely on an object. These forces create internal ones within the entity in the plane where the external forces are applied. The resultant of these internal forces is the shear in the section.
The average shearing stress can be calculated by dividing the shear by the area of the cross-section.
524
Elastic Strain Energy for Shearing Stresses01:20

Elastic Strain Energy for Shearing Stresses

165
As discussed in previous lessons, strain energy in a material is the energy stored when it is elastically deformed, a concept crucial in materials science and mechanical engineering. This energy results from the internal work done against the cohesive forces within the material. When a material undergoes shearing stress and corresponding shearing strain, the strain energy density, which is the energy stored per unit volume, is calculated. Within the elastic limit, where the stress is...
165
Shearing Strain01:20

Shearing Strain

229
The shearing strain represents a cubic element's angular change when subjected to shearing stress. This type of stress can transform a cube into an oblique parallelepiped without influencing normal strains. The cubic element experiences a significant transformation when exposed solely to shearing stress. Its shape alters from a perfect cube into a rhomboid, clearly demonstrating the effect of shearing strain. The degree of this strain is considered positive if it reduces the angle between...
229
Relation Between the Distributed Load and Shear01:23

Relation Between the Distributed Load and Shear

607
Understanding the relationship between the distributed load and shear force in structural analysis is crucial for analyzing beams subjected to various loading conditions. Consider the case of a beam experiencing a distributed load, two concentrated loads, and a couple moment.
607
Stress: General Loading Conditions01:15

Stress: General Loading Conditions

301
To grasp the intricacy of real-world conditions where multiple loads are applied simultaneously to a structure, one might visualize a section passing through a specific point within a body, aligned parallel to the xy plane. This section is subjected to various forces, including original loads, normal forces, and shearing forces.
The shearing force, possessing potential directionality within the plane of the section, is simplified into two component forces running parallel to the x and y axes....
301
Stress-Strain Diagram - Ductile Materials01:24

Stress-Strain Diagram - Ductile Materials

638
The stress-strain relationship in ductile materials such as structural steel or aluminium is intricate and progresses through several stages. When a specimen is loaded, it initially exhibits a linear length increase, depicted by a steep straight line on the stress-strain diagram. It indicates the material is elastically deforming and will return to its original shape once unloaded. However, when a critical stress value is reached, plastic deformation begins. This stage sees substantial...
638

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Updated: Jun 9, 2025

Kinematic History of a Salient-recess Junction Explored through a Combined Approach of Field Data and Analog Sandbox Modeling
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Rapid shear zone weakening during subduction initiation.

Yida Li1, Michael Gurnis1

  • 1Division of Geological and Planetary Sciences, Seismological Laboratory, California Institute of Technology, Pasadena, CA 91125.

Proceedings of the National Academy of Sciences of the United States of America
|October 25, 2024
PubMed
Summary
This summary is machine-generated.

Subduction initiation occurs rapidly due to fast strain weakening, as observed at the Puysegur example. This finding provides insights into early Earth tectonics and the onset of plate movement.

Keywords:
New Zealandgeodynamicsplate tectonicssubduction

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Area of Science:

  • Geophysics
  • Tectonics
  • Earth Science

Background:

  • Subduction zones are crucial for plate tectonics, driving plate motion via slab pull and weak megathrusts.
  • Subduction initiation is linked to slab pull accumulation and plate boundary weakness, significantly altering mantle convection.
  • The transient nature and intense activity during subduction initiation obscure critical evidence, making it difficult to study.

Purpose of the Study:

  • To overcome limitations in studying subduction initiation by analyzing the well-constrained Puysegur example.
  • To investigate the mechanisms and characteristics of subduction initiation using advanced computational and observational methods.

Main Methods:

  • Conducted time-dependent, three-dimensional thermo-mechanical computations.
  • Performed quantitative comparisons with new geophysical and geological data (topography, stratigraphy, seismicity).

Main Results:

  • Demonstrated that subduction initiation develops with rapid strain weakening, characterized by a small displacement (4–8 km).
  • Identified potential physical mechanisms for fast weakening, including grain-size reduction and fluid pressurization.
  • The Puysegur example serves as a well-constrained case study for subduction initiation.

Conclusions:

  • The rapid strain weakening observed at Puysegur offers insights into the formation of early Earth subduction zones.
  • Understanding subduction initiation is key to comprehending the onset and evolution of plate tectonics.
  • The findings have implications for understanding tectonic processes on early Earth and potentially other planetary bodies.