scholarly journals Three‐Dimensional Resistivity Structure of Iwo‐Yama Volcano, Kirishima Volcanic Complex, Japan: Relationship to Shallow Seismicity, Surface Uplift, and a Small Phreatic Eruption

2018 ◽  
Vol 45 (23) ◽  
Author(s):  
K. Tsukamoto ◽  
K. Aizawa ◽  
K. Chiba ◽  
W. Kanda ◽  
M. Uyeshima ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Phreatic Eruption ◽  
Volcanic Complex ◽  
Resistivity Structure ◽  
Surface Uplift

Crustal seismicity associated to rpid surface uplift at Laguna del Maule Volcanic Complex, Southern Volcanic Zone of the Andes

2018 ◽  
Vol 353 ◽  
pp. 83-94 ◽  
Author(s):  
Carlos Cardona ◽  
Andrés Tassara ◽  
Fernando Gil-Cruz ◽  
Luis Lara ◽  
Sergio Morales ◽  
...  
Keyword(s):  
Volcanic Complex ◽  
Volcanic Zone ◽  
Surface Uplift ◽  
The Andes ◽  
Southern Volcanic Zone

scholarly journals Crustal magma pathway beneath Aso caldera inferred from three-dimensional electrical resistivity structure

2016 ◽  
Vol 43 (20) ◽  
pp. 10,720-10,727 ◽  
Author(s):  
Maki Hata ◽  
Shinichi Takakura ◽  
Nobuo Matsushima ◽  
Takeshi Hashimoto ◽  
Mitsuru Utsugi
Keyword(s):  
Electrical Resistivity ◽  
Three Dimensional ◽  
Resistivity Structure ◽  
Aso Caldera ◽  
Crustal Magma

scholarly journals Three-dimensional resistivity structure of Asama Volcano revealed by data-space magnetotelluric inversion using unstructured tetrahedral elements

2016 ◽  
Vol 208 (3) ◽  
pp. 1359-1372 ◽  
Author(s):  
Yoshiya Usui ◽  
Yasuo Ogawa ◽  
Koki Aizawa ◽  
Wataru Kanda ◽  
Takeshi Hashimoto ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Resistivity Structure ◽  
Data Space ◽  
Tetrahedral Elements ◽  
Asama Volcano ◽  
Magnetotelluric Inversion

scholarly journals Reconstructing Surface Eruptive Sequence of 2018 Small Phreatic Eruption of Iwo-Yama Volcano, Kirishima Volcanic Complex, Japan by Infrasound Cross-correlation Analysis

2020 ◽  
Author(s):  
Dan Muramatsu ◽  
Takeshi Matsushima ◽  
Mie Ichihara
Keyword(s):  
Correlation Analysis ◽  
Cross Correlation ◽  
Phreatic Eruption ◽  
Volcanic Complex ◽  
Cross Correlation Analysis ◽  
Hazard Assessments ◽  
The Individual

Abstract The Iwo-yama volcano of the Kirishima Volcanic Complex in Japan had a small phreatic eruption in April 2018, which formed multiple vents. The activity was recorded by two infrasound sensors and two monitoring cameras which had been installed within 1 km of the vents. This study identified infrasonic signals from the multiple vents by a cross-correlation analysis between the two infrasound sensors. The analysis successfully revealed the signals from two main eruption craters and constrained the infrasound onsets at the individual vents in the two craters. We combined the results with the images from the cameras and reconstructed the sequence of the small phreatic eruption of Iwo-yama. Notably, the intense eruption accompanying remarkable infrasound delayed several hours to the eruption onset at each of the two craters. This study provides a sequence of the activities of the multiple vents in a phreatic eruption, which will be useful for understanding the phreatic eruption mechanism and hazard assessments.

The electrical resistivity structure of Archean to Tertiary lithosphere along 3200 km of SNORCLE profiles, northwestern Canada

2005 ◽  
Vol 42 (6) ◽  
pp. 1257-1275 ◽  
Author(s):  
Alan G Jones ◽  
Juanjo Ledo ◽  
Ian J Ferguson ◽  
Colin Farquharson ◽  
Xavier Garcia ◽  
...  
Keyword(s):  
Shear Zone ◽  
North American ◽  
Three Dimensional ◽  
Thickness Variation ◽  
Resistivity Structure ◽  
Seismic Reflection Data ◽  
Lithospheric Thickness ◽  
The North ◽  
Reflection Data ◽  
Great Slave Lake

Magnetotelluric (MT) measurements to image the three-dimensional resistivity structure of the North American continent from an Archean core to a region of Tertiary assembly were recorded at almost 300 sites along 3200 km of profiles on the Lithoprobe Slave – Northern Cordillera Lithospheric Evolution (SNORCLE) transect in northwestern Canada. At the largest scale, the MT results indicate significant lithospheric thickness variation, from 260 km at the southwest margin of the Slave craton to significantly < 100 km at the southwestern end of the SNORCLE transect in the Cordillera. At intermediate scale, the resistivity results allow broad terrane subdivisions to be made. Several anomalously conductive zones along the SNORCLE transect, in rocks ranging in age from Archean to Tertiary, are attributed to the introduction of either water or carbon into the crust and mantle during subduction processes. At the local scale, the MT data image two major faults crossing the study area, the Great Slave Lake shear zone and the Tintina Fault. The resistivity images show that both the Tintina Fault and Great Slave Lake shear zone form crustal-scale features, and that the Tintina Fault has a remarkably uniform resistivity signature over a 400 km strike length in the study area. Arguably the most controversial conclusion reached is that the MT data do not support the western extension of North American autochthonous basement suggested from interpretation of the seismic reflection data.

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