نتایج جستجو برای: volcano

تعداد نتایج: 7435  

Journal: :Science 2004
Alexander Gerst Martha K Savage

The orientation of crustal seismic anisotropy changed at least twice by up to 80 degrees because of volcanic eruptions at Ruapehu Volcano, New Zealand. These changes provide the basis for a new monitoring technique and possibly for future midterm eruption forecasting at volcanoes. The fast anisotropic direction was measured during three seismometer deployments in 1994, 1998, and 2002, providing...

2015
Jonathan Rougier Stephen R. Sparks Katharine V. Cashman

The large-eruption rates of stratovolcanoes are modelled exchangeably, in order to derive an informative prior distribution as an input into a subsequent volcano-by-volcano hazard assessment. Derivation and implementation of the likelihood function is not straightforward, necessitating a detailed code verification. Analysis of the LaMEVE database suggests that most of the world’s stratovolcanoe...

Journal: :Journal of Geophysical Research: Solid Earth 2006

2010
Zhong Lu Daniel Dzurisin Juliet Biggs Charles Wicks Steve McNutt

[1] Starting soon after the 1997 eruption at Okmok volcano and continuing until the start of the 2008 eruption, magma accumulated in a storage zone centered ∼3.5 km beneath the caldera floor at a rate that varied with time. A Mogi‐type point pressure source or finite sphere with a radius of 1 km provides an adequate fit to the deformation field portrayed in time‐sequential interferometric synth...

Journal: :Math. Comput. 2010
Sorina Ionica Antoine Joux

Isogeny volcanoes are graphs whose vertices are elliptic curves and whose edges are `-isogenies. Algorithms allowing to travel on these graphs were developed by Kohel in his thesis (1996) and later on, by Fouquet and Morain (2001). However, up to now, no method was known, to predict, before taking a step on the volcano, the direction of this step. Hence, in Kohel's and Fouquet-Morain algorithms...

2007
Jene A. Golovchenko

We explore the ion beam-induced dynamics of the formation of large features at the edges of nanopores in freestanding silicon nitride membranes. The shape and size of these ìnanovolcanoesî, together with the rate at which the nanopores open or close, are shown to be strongly influenced by sample temperature. Volcano formation and pore closing slow and stop at low temperatures and saturate at hi...

2014
Anthony L. Gerig David L. Bradley

Mud volcanoes are solid objects that form on the seafloor due to the emission of gas and fluidized sediment from the earth’s interior [1]. They vary widely in size, can be exposed, proud, or buried, and are of interest to the Navy as sources of active sonar clutter [2]. The long-term goal of this work is to accurately model mud volcano scattering. The final product will make predicting and simu...

2015
Michael Naaman Robin Sickles

Power-law distributions have a wide range of applications including physics, economics, and biology. We derive a new family of densities with support on the real line which obeys a broken power law called the volcano distribution. An estimation procedure is also outlined. The volcano density is very flexible as it can be unbounded or bimodal. It allows for an infinite mean or an undefined mean....

2004
V. Singhroy H. Ohkura K. Molch R. Couture

Our research has shown that interferometric SAR techniques can be used to monitor deformation at landslides and volcanoes under specific conditions. Special filtered interferograms are being used to reduce speckle and minimize errors created by vegetation. InSAR images were used to monitor current post slide motion along existing fault lines at the Frank Slide a 30 x 10 m rock avalanche, in the...

2009
A. McEwen L. Keszthelyi J. Spencer N. Thomas T. Johnson P. Wurz K.-H. Glassmeier C. Shinohara T. Girard G. Heinsohn R. Furfaro T. Gardner D. Cheeseman R. Beatty J. Ludwinski T. Kowalkowski C. Yen T. Elliott E. Turtle K. Strohbehn C. Falco R. Evans

tensen, P. Wurz, K.-H. Glassmeier, C. Shinohara, T. Girard, G. Heinsohn, R. Furfaro, T. Gardner, D. Cheeseman, R. Beatty, J. Ludwinski, T. Kowalkowski, C. Yen, T. Elliott, E. Turtle, K. Strohbehn, J. Janesick, C. Falco, R. Evans University of Arizona (Tucson, [email protected]), USGS, SwRI/Boulder, U. Bern, JPL, ASU, IGEP, Microsat Systems Inc., Raytheon MS, APL, Sarnoff Corp., Gibble Corp.

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