Journal ArticleDOI
Codalike multiple scattering of elastic waves in dense granular media
TLDR
The diffusion approximation is shown to describe adequately the transport of elastic waves dominated by shear waves over long distance scales and a short-range correlation of the force chains is revealed.Abstract:
We study the multiple scattering of short-wavelength ultrasound through the force networks in dry and wet glass bead packings under stress. Over long distance scales, the diffusion approximation is shown to describe adequately the transport of elastic waves dominated by shear waves. The recovered transport mean path reveals a short-range correlation of the force chains. Also we observe the drastic effect of wetting liquids on the energy dissipation in the granular medium. The relevance of these experimental findings for the seismological applications is discussed.read more
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Journal ArticleDOI
Nonlinear dynamics, granular media and dynamic earthquake triggering
Paul A. Johnson,Xiaoping Jia +1 more
TL;DR: It is shown that the dynamic, elastic-nonlinear behaviour of fault gouge perturbed by a seismic wave may trigger earthquakes, even with such small strains as the dynamic strain amplitudes from a large earthquake are exceedingly small.
Nonlinear Dynamics, Granular Media and Dynamic Earthquake Triggering
Paul A. Johnson,Xiaoping Jia +1 more
TL;DR: In this article, the authors show that the dynamic, elastic-nonlinear behaviour of fault gouge perturbed by a seismic wave may trigger earthquakes, even with such small strain amplitudes, and infer that, if the fault is weak, seismic waves cause the fault core modulus to decrease abruptly and weaken further.
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Sources and characteristics of acoustic emissions from mechanically stressed geologic granular media — A review
TL;DR: In this paper, the authors present a review of the use of acoustic emissions (AE) for monitoring of failure in various geologic materials, and describe AE generating source mechanisms in mechanically stressed geologic media (e.g., frictional sliding, micro-crackling, particle collisions, rupture of water bridges, etc.) including AE statistical features such as frequency content and occurrence probabilities.
Journal ArticleDOI
Scaling of phononic transport with connectivity in amorphous solids
Matthieu Wyart,Matthieu Wyart +1 more
TL;DR: In this article, the effect of coordination on transport was investigated theoretically using random networks of springs as model systems, and an effective medium approximation was made to compute the density of states of the vibrational modes, their energy diffusivity (a spectral measure of transport) and their spatial correlations as the network coordination z is varied.
Journal ArticleDOI
Atomistic response of a model silica glass under shear and pressure
TL;DR: In this article, a model silica glass is studied at the submicrometer scale with the help of atomistic simulations, and the analysis of the response to a hydrostatic compression is compared to recent experimental results.