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Analysis of Magma Injection Beneath an Active Volcano Using a Hydromechanical Numerical Model
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, Horizontal Wells 2017, May 2017, Volume 2017, p.1 - 5
Abstract
A numerical model was used for a geomechanical analysis of dike formation beneath the Koryaksky Volcano, which was active during 2008 through 2009. We investigated whether seismicity associated with the volcanic activity may have been influenced by flow of magma into preexisting fault structures. In our conceptual model, magma flowed into a 2 km (along dip) by 2 km (along strike) fracture located at a depth of 6000 m (-3000 m abs.) with a dip angle of 60. In the model, magma was injected into the fracture over the period of one day at a rate of 2000 kg/s and a maximum pressure of 200 MPa. The initial fluid pressure in the fault was 50 MPa. The magma density was 2800 kg/m3. We tested various magma viscosities ranging from 200 Pa s (andesitic magma) to 2 Pa s (basaltic magma). The state of stress in the study are was determined in a previous study.