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Jon J. Major

Researcher at United States Geological Survey

Publications -  85
Citations -  4307

Jon J. Major is an academic researcher from United States Geological Survey. The author has contributed to research in topics: Debris flow & Volcano. The author has an hindex of 33, co-authored 82 publications receiving 3800 citations. Previous affiliations of Jon J. Major include Cascades Volcano Observatory.

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Debris-flow deposition: Effects of pore-fluid pressure and friction concentrated at flow margins

TL;DR: This paper measured porefluid pressure and total bed-normal stress at the base of several ~10 m 3 experimental debris flows to understand the process of debris-flow deposition, and found that pore-fluid pressures nearly sufficient to cause liquefaction were developed and maintained during flow mobilization and acceleration, persisted in debrisflow interiors during flow deceleration and deposition and dissipated significantly only during postdepositional sediment consolidation.
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Depositional Processes in Large-Scale Debris-Flow Experiments

TL;DR: The authors examined the depositional process and characteristics of large-scale experimental debris flows (to 15 m3) composed of mixtures of gravel (to 32 mm), sand, and mud, and found that sediment accumulations developed in a complex manner through a combination of shoving forward and shouldering aside previously deposited debris and through progressive vertical accretion.
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Debris Flow Rheology: Experimental Analysis of Fine-Grained Slurries

TL;DR: In this paper, the authors measured the rheology of 2-mm sediment from a natural debris flow deposit using a wide-gap concentric-cylinder viscometer.
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Rainfall, ground-water flow, and seasonal movement at Minor Creek landslide, northwestern California: Physical interpretation of empirical relations

TL;DR: In this paper, the authors present detailed data on rainfall, ground-water flow, and repetitive seasonal motion that occurred from 1982 to 1985 at Minor Creek landslide in northwestern California, and interpret these data in the context of physically based theories.
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Dynamics of seismogenic volcanic extrusion at Mount St Helens in 2004–05

TL;DR: It is inferred that the volcano was probably poised in a near-eruptive equilibrium state long before the onset of the 2004–05 eruption, and a dynamical model is formalized that reveals a strong analogy between behaviour of the magma–plug system and that of a variably damped oscillator.