@article{e2786fcad98d488bbbb273b769c3a1c9,
title = "The Role of Tectonic Stress in Triggering Large Silicic Caldera Eruptions",
abstract = "We utilize 3-D temperature-dependent viscoelastic finite element models to investigate the mechanical response of the host rock supporting large caldera-size magma reservoirs (volumes >102 km3) to local tectonic stresses. The mechanical stability of the host rock is used to determine the maximum predicted repose intervals and magma flux rates that systems may experience before successive eruption is triggered. Numerical results indicate that regional extension decreases the stability of the roof rock overlying a magma reservoir, thereby promoting early-onset caldera collapse. Alternatively, moderate amounts of compression (≤10 mm/year) on relatively short timescales (<104 years) increases roof rock stability. In addition to quantifying the affect of tectonic stresses on reservoir stability, our models indicate that the process of rejuvenation and mechanical failure is likely to take place over short time periods of hundreds to thousands of years. These findings support the short preeruption melt accumulation timescales indicated by U series disequilibrium studies.",
keywords = "Collapse calderas, eruption triggers, external eruption triggers, flux rates, numerical model, repose periods",
author = "Cabaniss, {Haley E.} and Gregg, {Patricia M.} and Grosfils, {Eric B.}",
note = "Funding Information: This work was supported by a University of Illinois startup fund (Cabaniss and Gregg), by NSF (OCE1634995, Cabaniss and Gregg) and by NASA (NNX12AO49G, Grosfils). We gratefully acknowledge helpful insightful reviews by G. De Natale, C. Wauthier, T. Masterlark, and an anonymous reviewer, which greatly improved this manuscript. We are grateful for helpful comments by and discussions with S. de Silva, C. Wilson, L. Karlstrom, D. Burns, D. Geist, B. Chadwick, S. Nooner, S. Marshak, Y. Zhan, J. Albright, R. Goldman, and the UIUC Geodynamics Group. Data in support of this manuscript are published in the PANGAEA data repository and available online (https://doi.pangaea.de/10.1594/PANGAEA.885992). Funding Information: This work was supported by a University of Illinois startup fund (Cabaniss and Gregg), by NSF (OCE1634995, Cabaniss and Gregg) and by NASA (NNX12AO49G, Grosfils). We gratefully acknowledge helpful insightful reviews by G. De Natale, C. Wauthier, T. Masterlark, and an anonymous reviewer, which greatly improved this manuscript. We are grateful for helpful comments by and discussions with S. de Silva, C. Wilson, L. Karlstrom, D. Burns, D. Geist, B. Chadwick, S. Nooner, S. Marshak, Y. Zhan, J. Albright, R. Goldman, and the UIUC Geodynamics Group. Data in support of this manuscript are published in the PANGAEA data repository and available online (https://doi.pangaea.de/10.1594/ PANGAEA.885992). Publisher Copyright: {\textcopyright}2018. American Geophysical Union. All Rights Reserved.",
year = "2018",
month = may,
day = "16",
doi = "10.1029/2018GL077393",
language = "English (US)",
volume = "45",
pages = "3889--3895",
journal = "Geophysical Research Letters",
issn = "0094-8276",
publisher = "American Geophysical Union",
number = "9",
}