Results 81 to 90 of about 70,364 (285)

Hidden Markov graphical models with state‐dependent generalized hyperbolic distributions

Canadian Journal of Statistics, EarlyView.
Abstract In this article, we develop a novel hidden Markov graphical model to investigate time‐varying interconnectedness between different financial markets. To identify conditional correlation structures under varying market conditions and accommodate shape features embedded in financial time series, we rely upon the generalized hyperbolic family of ...
Beatrice Foroni, Luca Merlo, Lea Petrella   +2 more
wiley   +1 more source

Spread or Splash: The Ubiquitous Role of Droplets in Mafic Explosive Eruptions

Geochemistry, Geophysics, Geosystems
Magma fragmentation is an essential process driving explosive volcanic eruptions, generating a distribution of pyroclasts with characteristic shape and grain size.
Pier Paolo Comida, Thomas J. Jones
doaj   +1 more source

Stress Field Control of Eruption Dynamics

, 2017
Increasing evidence supports the claim that stress changes play a fundamental role in triggering volcanic eruptions. Stress changes may vary in origin to include earthquakes, erosion and landslide processes, deglaciation, or tidal effects. The local stress can also change as response of magma influx from deeper reservoirs and an increase of the magma ...
Antonio Costa, Roberto Sulpizio, Geoffrey Wadge   +2 more
openaire   +3 more sources

Characterizing the dynamics of geyser eruptions [PDF]

Eos, Transactions American Geophysical Union, 2013
Some geysers have predictable eruptions that make them ideal for study. Understanding geyser eruption dynamics can provide insight into other intermittent natural processes, such as volcanic eruptions, but most studies of geysers have focused on the processes that trigger geyser eruption. The eruption jet dynamics are less well characterized.
openaire   +1 more source

Research progress and current status of dynamic wave propagation characteristics in rock mass: A review

Deep Underground Science and Engineering, EarlyView.
This review elucidates the velocity–dispersion–attenuation coupling mechanisms of wave propagation in rock masses, compares six representative models, and reveals how pressure, temperature, mineral composition, and anisotropy jointly control dynamic responses in complex geological media.
Jiajun Shu, Tao Li, Ruiqi Yuan, Yue Li, Bingni Wu, Bo Liu, Zhengding Deng, Galindo Rubén, Fausto Molina‐Gómez   +8 more
wiley   +1 more source

Sympathetic Eruption of Two Filaments and Associated Solar Coronal Jet

The Astrophysical Journal
Combining the high-quality observations from the Solar Dynamics Observatory, the Global Oscillation Network Group, and the Chinese H α Solar Explorer, we report a solar coronal jet triggered by the sympathetic eruption of two filaments on 2024 January 11.
Jiayan Yang, Leping Li, Huadong Chen, Yi Bi, Bo Yang, Junchao Hong, Yan Dong   +6 more
doaj   +1 more source

High‐Titanium Zircon Rims in Rhyolite – A Reflection of Adiabatic Ascent?

Geological Journal, EarlyView.
The ascent of granitic magma from source to emplacement is rapidly achieved through dyking, resulting in negligible heat loss to the surrounding wallrock (i.e., adiabatic). Zircon growth during ascent can record the changing magma conditions including adiabatic cooling and heating, resulting in high titanium rims on low titanium cores without ...
Carson Kinney, Holden Little, Chris Yakymchuk   +2 more
wiley   +1 more source

Quantifying volumes of volcanic deposits using time-averaged ASTER digital elevation models

Science of Remote Sensing
Quantifying the volume of erupted volcanic material, particularly lava flows and domes, provides critical insights into the dynamics of an eruption. This in turn aids in future hazard modeling, mitigation, and response.
Ian T.W. Flynn, Daniel B. Williams, Michael S. Ramsey   +2 more
doaj   +1 more source

Sunshine Duration in Brazil From Meteosat (1983–2020): Climatology, Variability and Long‐Term Trends

International Journal of Climatology, EarlyView.
Using nearly four decades of Meteosat satellite data (1983–2020), this study presents a country‐wide climatology of sunshine duration (SDU) in Brazil. The results reveal marked regional contrasts, dominant modes of variability, and significant long‐term trends, providing new information on the most relevant meteorological systems that influence SDU and
Maria Lívia Lins Mattos Gava, Simone Marilene Sievert da Costa, Íris Paraguay Silva   +2 more
wiley   +1 more source

Volcanic Precursor Revealed by Machine Learning Offers New Eruption Forecasting Capability

Geophysical Research Letters
Seismicity at active volcanoes provides crucial constraints on the dynamics of magma systems and complex fault activation processes preceding and during an eruption.
Kaiwen Wang, Felix Waldhauser, Maya Tolstoy, David Schaff, Theresa Sawi, William S. D. Wilcock, Yen Joe Tan   +6 more
doaj   +1 more source