First posted May 11, 2023 For additional information, contact: Alaska Volcano ObservatoryU.S. Geological Survey4210 University DriveAnchorage, AK 99508 The Observatory responded to eruptions, volcanic unrest or suspected unrest, increased seismicity, and other significant activity at 17 centers in 2019. most notable was an eruption of Shishaldin Volcano, featuring eruptive that produced lava fl...

We introduce a class of deterministic lattice models of failure, Abelian avalanche (AA) models, with continuous phase variables, similar to discrete Abelian sandpile (ASP) models. We investigate analytically the structure of the phase space and statistical properties of avalanches in these models. We show that the distributions of avalanches in AA and ASP models with the same redistribution mat...

Submitted for the MAR12 Meeting of The American Physical Society Scale-free avalanches in disordered systems of localized charges with long-range Coulomb interaction1 MATTEO PALASSINI, MARTIN GOETHE, Faculty of Physics, University of Barcelona, Spain — We study theoretically and numerically the charge avalanches created by a perturbation in disordered systems of localized charges with unscreene...

Our mysterious brain is believed to operate near a non-equilibrium point and generate critical self-organized avalanches in neuronal activity. Recent experimental evidence has revealed significant heterogeneity in both synaptic input and output connectivity, but whether the structural heterogeneity participates in the regulation of neuronal avalanches remains poorly understood. By computational...

Avalanche behavior of gravitationally-forced granular layers on a rough inclined plane are investigated experimentally for different materials and for a variety of grain shapes ranging from spherical beads to highly anisotropic particles with dendritic shape. We measure the front velocity, area and the height of many avalanches and correlate the motion with the area and height. We also measure ...

In high-altitude and cold regions, external dynamic geological processes, such as glacial melting other processes are intense, which frequently results in surface slope collapse, landslides, debris flows, ice avalanches along the route. For high steep slopes regions containing controlled fractures, key is to grasp water-heat process evolution of frost heaving force induced by it within fracture...

Debris flows entrain sediments and water along their flow path grow significantly in size. Because the entrainment process isn’t well understood data is rare, hazard risk assessment with numerical models challenging. It known, however, that both for debris rock avalanches, interstitial pore substrate can cause increases pressures when overridden by flow, which enhances erosion. The entrained li...

Collapse of granular material is usually accompanied by long run-out flows in natural hazards, e.g. rock/debris flow and snow avalanches. This paper presents a novel multi-scale approach for modelling column collapse with large deformation. employs the smoothed particle hydrodynamics (SPH) method to solve deformation boundary value problems, while using micromechanical model derive nonlinear re...