scholarly journals Unprecedented pressure increase in deep magma reservoir triggered by lava-dome collapse

2006 ◽  
Vol 33 (3) ◽  
Author(s):  
B. Voight ◽  
A. T. Linde ◽  
I. S. Sacks ◽  
G. S. Mattioli ◽  
R. S. J. Sparks ◽  
...  
Keyword(s):  
Lava Dome ◽  
Magma Reservoir ◽  
Pressure Increase ◽  
Dome Collapse ◽  
Lava Dome Collapse

scholarly journals Post-Caldera Eruptions at Chalupas Caldera, Ecuador: Determining the Timing of Lava Dome Collapse, Hummock Emplacement and Dome Rejuvenation

2020 ◽  
Vol 8 ◽  
Author(s):  
Marco D. Córdova ◽  
Patricia Ann Mothes ◽  
H. Elizabeth Gaunt ◽  
Josué Salgado
Keyword(s):  
Lava Dome ◽  
Radiometric Dating ◽  
Potential Hazard ◽  
Geological Features ◽  
Tephra Layers ◽  
Electron Microscope Analysis ◽  
Dome Collapse ◽  
Remote Sensing Techniques ◽  
Shed Light ◽  
Lava Dome Collapse

Determining the lithology, extent, origin, and age of hummocks can be challenging, especially if these are covered by successive deposits and lush vegetation. At Chalupas caldera, a late-Pleistocene silicic center that lies astride the Eastern Cordillera of northern Ecuador, we have tried to overcome these difficulties by combining geological observations and sampling, laboratory analysis (geochemistry, scanning electron microscope analysis and radiometric dating) and remote sensing techniques. Chalupas is the second largest caldera in the Northern Volcanic Zone of South America and its VEI 7 eruption, which occurred ∼0.21 Ma, has garnered the attention of the volcanological community. Our research highlights new observations of the post-caldera activity at Chalupas, beginning with the growth of Quilindaña stratovolcano (∼0.170 Ma), followed by the formation of Buenavista dome that is located 5 km eastward of Quilindaña’s summit. At the eastern foot of Buenavista dome we identify hummocky terrain covering an area of ∼20 km2. Collectively, the suite of techniques that we used helped to highlight geological features that shed light on the provenance of the hummocks and demonstrate that this topography may have originated from gravitational breccia flows from Buenavista lava dome. Numerical simulations were also performed to represent breccia flow transit and emplacement over the present caldera landscape and to view the potential hazard footprints of a future Buenavista dome collapse. For modeling we employed volumes of 20–120 Mm3 to visualize the consecutive traces of mass flow deposition and how the traces correspond to the hummocky landscape. Following the partial collapse of Buenavista lava dome, its rejuvenation is represented by tephra layers of several small eruptions that are dated at about 40 ky BP. These tephras represent some of the youngest eruptive activity recognized at Chalupas caldera. Our results contribute to the overall knowledge about Chalupas and demonstrate that eruptions at this important caldera are more recent than was previously reported.

Lava dome collapse causes pyroclastic flows

Eos ◽  
1993 ◽  
Vol 74 (27) ◽  
pp. 306
Author(s):  
Curtis R. Manley
Keyword(s):  
Lava Dome ◽  
Pyroclastic Flows ◽  
Dome Collapse ◽  
Lava Dome Collapse

scholarly journals Effect of rainfall on dacitic lava dome collapse at Unzen volcano, Japan.

1998 ◽  
Vol 48 (3) ◽  
pp. 73-78 ◽  
Author(s):  
Hitoshi Yamasato ◽  
Sadayuki Kitagawa ◽  
Manabu Komiya
Keyword(s):  
Lava Dome ◽  
Unzen Volcano ◽  
Dacitic Lava ◽  
Dome Collapse ◽  
Lava Dome Collapse

scholarly journals Presentation and analysis of a worldwide database for lava dome collapse events: the Global Archive of Dome Instabilities (GLADIS)

2019 ◽  
Vol 81 (3) ◽  
Author(s):  
Claire E. Harnett ◽  
Mark E. Thomas ◽  
Eliza S. Calder ◽  
Susanna K. Ebmeier ◽  
Alison Telford ◽  
...  
Keyword(s):  
Lava Dome ◽  
Dome Collapse ◽  
Lava Dome Collapse
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