scholarly journals How Accurately Can We Model Magma Reservoir Failure With Uncertainties in Host Rock Rheology?

2019 ◽  
Vol 124 (8) ◽  
pp. 8030-8042 ◽  
Author(s):  
Y. Zhan ◽  
P. M. Gregg
Keyword(s):  
Host Rock ◽  
Magma Reservoir ◽  
Rock Rheology

Linking thermomechanical models with geodetic observations to evaluate the 2018 eruption of Sierra Negra Volcano, Galápagos

2020 ◽  
Author(s):  
Patricia Gregg ◽  
Yan Zhan ◽  
Falk Amelung ◽  
Jack Albright ◽  
Dennis Geist ◽  
...  
Keyword(s):  
Data Assimilation ◽  
Host Rock ◽  
Volcanic Eruptions ◽  
Magma Reservoir ◽  
Tensile Failure ◽  
Model Calculations ◽  
Coulomb Failure ◽  
Magma System ◽  
Sierra Negra Volcano ◽  
Sierra Negra

<p>Ensemble based data assimilation approaches, such as the Ensemble Kalman Filter (EnKF), have been widely and successfully implemented to combine observations with dynamic models to investigate the evolution of a system’s state. Such inversions are powerful tools for providing forecasts as well as “hindcasting” events such as volcanic eruptions to investigate source parameters and triggering mechanisms. In this study, a high performance computing (HPC) adaptation of the EnKF is used to assimilate ground deformation observations from interferometric synthetic-aperture radar (InSAR) into high-fidelity, multiphysics finite element models to evaluate the prolonged unrest and June 26, 2018 eruption of Sierra Negra volcano, Galápagos. The stability of the Sierra Negra magma system is evaluated at each time step by estimating variations in reservoir overpressure, Mohr-Coulomb failure in the host rock, and tensile stress and failure along the reservoir boundary. The deformation of Sierra Negra is tracked over a decade, during which almost 5 meters of surface uplift has been recorded. The EnKF reveals that the evolution of the stress state in the host rock surrounding the Sierra Negra magma reservoir likely controlled the timing of the eruption. While increases in magma reservoir overpressure remained modest (< 10 MPa) throughout the data assimilation time period, significant Mohr-Coulomb failure is indicated in the lead up to the eruption coincident with increased seismicity along both trapdoor faults within Sierra Negra’s caldera and along the caldera’s ring faults. During the final stages of pre-eruptive unrest, the EnKF models indicate limited tensile failure, with no tensile failure along the northern portion of the magma system where the eruption commenced. Most strikingly, model calculations of significant through-going Mohr-Coulomb failure correspond in space and time with a Mw 5.4 earthquake recorded in the hours preceding the 2018 eruption. Subsequent stress modeling implicates the Mw 5.4 earthquake along the southern intra-caldera trapdoor fault as the potential catalyst for tensile failure and dike initiation along the reservoir to the north. In conclusion, the volcano EnKF approach successfully tracked the evolving stability of Sierra Negra, indicating great potential for future forecasting efforts.</p>

scholarly journals Effect of host-rock rheology on dyke shape, thickness and magma overpressure

2016 ◽  
Vol 208 (3) ◽  
pp. 1414-1429 ◽  
Author(s):  
Rémi Vachon ◽  
Christoph F. Hieronymus
Keyword(s):  
Host Rock ◽  
Rock Rheology

Host rock rheology controls on the emplacement of tabular intrusions: Implications for underplating of extending crust

Tectonics ◽  
1992 ◽  
Vol 11 (6) ◽  
pp. 1348-1356 ◽  
Author(s):  
Tom Parsons ◽  
Norman H. Sleep ◽  
George A. Thompson
Keyword(s):  
Host Rock ◽  
Rock Rheology

Optimal Density Determination of Bouguer Anomaly Using Fractal Analysis (Case of study: Charak area,IRAN)

2005 ◽  
Vol 1 (1) ◽  
pp. 21-24
Author(s):  
Hamid Reza Samadi
Keyword(s):  
Surface Roughness ◽  
Fractal Dimension ◽  
Fractal Analysis ◽  
Fractal Geometry ◽  
Host Rock ◽  
Bouguer Anomaly ◽  
Research Area ◽  
Density Difference ◽  
Optimal Density

In exploration geophysics the main and initial aim is to determine density of under-research goals which have certain density difference with the host rock. Therefore, we state a method in this paper to determine the density of bouguer plate, the so-called variogram method based on fractal geometry. This method is based on minimizing surface roughness of bouguer anomaly. The fractal dimension of surface has been used as surface roughness of bouguer anomaly. Using this method, the optimal density of Charak area insouth of Hormozgan province can be determined which is 2/7 g/cfor the under-research area. This determined density has been used to correct and investigate its results about the isostasy of the studied area and results well-coincided with the geology of the area and dug exploratory holes in the text area

PETROLOGICAL FORENSICS OF THE MOUNT SINABUNG, SUMATRA, INDONESIA MAGMA RESERVOIR PRIOR TO MAY 2016 DOME COLLAPSE

2019 ◽  
Author(s):  
Jade M. Bowers ◽  
◽  
Shanaka L. de Silva ◽  
Frank J. Tepley ◽  
Indyo Pratomo ◽  
...  
Keyword(s):  
Magma Reservoir ◽  
Dome Collapse

DETERMINING HOST-ROCK ENVIRONMENT OF TOURMALINITES USING LASER-INDUCED BREAKDOWN SPECTROSCOPY

2019 ◽  
Author(s):  
Shoshauna Farnsworth-Pinkerton ◽  
◽  
Barbara L. Dutrow ◽  
Darrell J. Henry ◽  
Nancy J. McMillan
Keyword(s):  
Host Rock ◽  
Laser Induced Breakdown Spectroscopy ◽  
Breakdown Spectroscopy ◽  
Laser Induced Breakdown
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