Atsuko Namiki
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View article: A computed tomography observation of the Unzen lava reveals the frequent existence of vesicles and crystals in proximity
A computed tomography observation of the Unzen lava reveals the frequent existence of vesicles and crystals in proximity Open
Volcanic outgassing through interconnected bubble networks controls eruption dynamics. Frameworks formed by crystals may facilitate gas escape, but the relative spatial arrangements of bubbles and crystals remain overlooked. We conducted m…
View article: Crystal‐Rich Magma Is Solid‐Like and Liquefies When Deformed
Crystal‐Rich Magma Is Solid‐Like and Liquefies When Deformed Open
The rheology of highly crystalline magma regulates its mobility, which may, in turn, determine the occurrence and styles of volcanic eruptions. We measured the rheology of high‐temperature magma with a basaltic‐andesite composition to docu…
View article: An Experimental Model of Unconfined Bubbly Lava Flows: Importance of Localized Bubble Distribution
An Experimental Model of Unconfined Bubbly Lava Flows: Importance of Localized Bubble Distribution Open
Most lava flows carry bubbles and crystals in suspension. From earlier works, it is known that spherical bubbles increase the effective viscosity while bubbles deformed by rapid flow decrease it. Changes in the spatial distribution of bubb…
View article: Fragility and an extremely low shear modulus of high porosity silicic magma
Fragility and an extremely low shear modulus of high porosity silicic magma Open
<p>The rheology and strength of bubbly magma govern eruption dynamics by determining the possibility of fragmentation of ascending magmas. The rheology of magma also regulates the propagation velocity and attenuation of seismic waves…
View article: Volcanic activities triggered or inhibited by resonance of volcanic edifices to large earthquakes
Volcanic activities triggered or inhibited by resonance of volcanic edifices to large earthquakes Open
The existence of a causal link between large earthquakes and volcanic unrest is widely accepted. Recent observations have also revealed counterintuitive negative responses of volcanoes to large earthquakes, including decreased gas emission…
View article: An experimental study of the role of subsurface plumbing on geothermal discharge
An experimental study of the role of subsurface plumbing on geothermal discharge Open
In order to better understand the diverse discharge styles and eruption intervals observed at geothermal features, we performed here three series of laboratory experiments with differing plumbing geometries. A single, straight conduit that…
View article: Sloshing of a bubbly magma reservoir as a mechanism of triggered eruptions
Sloshing of a bubbly magma reservoir as a mechanism of triggered eruptions Open
Large earthquakes sometimes activate volcanoes both in the near field as well as in the far field. One possible explanation is that shaking may increase the mobility of the volcanic gases stored in magma reservoirs and conduits. Here exper…