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  • 1
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    Impact of Crustal Rheology on Temperature‐Dependent Viscoelastic Models of Volcano Deformation: Application to Taal Volcano, Philippines (2019)
    Wiley
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    Publication Date: 2019
    Description: Abstract We use ALOS‐1 interferometric synthetic aperture radar data spanning the period of 2007–2011 to obtain time‐dependent ground deformation data over Taal caldera related to the 2010–2011 volcanic unrest, which did not lead to an eruption. We employ finite element models that account for subsurface thermomechanical properties to test for viscoelastic deformation. We also examine the variability of crustal rheological parameters of the temperature‐dependent Arrhenius formulation for viscosity, to investigate the effects on surface deformation. Deformation at Taal is observed to be time dependent and explained by a linear rate of pressure increase in a shallow magma reservoir at 5‐km depth within a hot and viscoelastic upper crust. The best‐fitting rheological properties of the local setting are consistent with either a felsic or hydrothermally altered uppermost crust. We show the significantly different effects that the variation of rheological parameters has on surface deformation, highlighting the importance of incorporation into future studies of deformation at different volcanic settings.
    Print ISSN: 2169-9313
    Electronic ISSN: 2169-9356
    Topics: Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 2
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    Viscoelastic perturbations of the earth: significance of the incremental gravitational force in models of glacial isostasy (1994)
    In:  Geophys. J. Int., Luxembourg, EGS-Gauthier-Villars, vol. 117, no. 3-4, pp. 864-879, pp. 2214
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    Publication Date: 1994
    Keywords: Inelastic ; Gravimetry, Gravitation ; Elasticity ; Modelling ; GJI
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    BIBLIOGRAPHY SEISMOLOGY
  • 3
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    Seismic tomography and deformation modeling of the junction of the San Andreas and Calaveras faults (1996)
    In:  J. Geophys. Res., London, Elsevier, vol. 101, no. 8, pp. 27,917-27,942, pp. 2083, (ISBN 1-86239-117-3)
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    Publication Date: 1996
    Keywords: Tomography ; Fault zone ; triple ; junction ; Modelling ; Crustal deformation (cf. Earthquake precursor: deformation or strain) ; JGR
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    BIBLIOGRAPHY SEISMOLOGY
  • 4
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    Coseismic and postseismic deformation due to the 2007 M5.5 Ghazaband fault earthquake, Balochistan, Pakistan (2015)
    Wiley
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    Publication Date: 2015-04-25
    Description: Time-series analysis of InSAR data reveal coseismic and postseismic surface displacements associated with the 2007 M5.5 earthquake along the southern Ghazaband fault, a major but little studied fault in Pakistan. Modeling indicates that the coseismic surface deformation was caused by ~9 cm of strike-slip displacement along a shallow subvertical fault. The earthquake was followed by at least one year of afterslip, releasing ~70% of the moment of the main event, equivalent to a ~M5.4 event. This high aseismic relative to the seismic moment release is consistent with previous observations for moderate earthquakes (M〈6) and suggests that smaller earthquakes are associated with a higher aseismic relative to seismic moment release than larger earthquakes.
    Print ISSN: 0094-8276
    Electronic ISSN: 1944-8007
    Topics: Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 5
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    Geodetic evidence for interconnectivity between Aira and Kirishima magmatic systems, Japan (2018)
    Springer Nature
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    Publication Date: 2018-06-29
    Description: Geodetic evidence for interconnectivity between Aira and Kirishima magmatic systems, Japan Geodetic evidence for interconnectivity between Aira and Kirishima magmatic systems, Japan, Published online: 28 June 2018; doi:10.1038/s41598-018-28026-4 Geodetic evidence for interconnectivity between Aira and Kirishima magmatic systems, Japan
    Electronic ISSN: 2045-2322
    Topics: Natural Sciences in General
    Published by Springer Nature
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  • 6
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    Stress control of deep rift intrusion at Mauna Loa volcano, Hawaii (2007)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 2007-05-19
    Description: Mauna Loa volcano, Hawaii, deforms by a combination of shallow dike intrusions in the rift zones and earthquakes along the base of the volcano, but it is not known how the spreading is accommodated in the lower part of the volcanic edifice. We present evidence from interferometric synthetic aperture radar data for secular inflation of a dike-like magma body at intermediate depth in the southwest rift zone during 2002 to 2005. Magma accumulation occurred in a section of the rift zone that was unclamped by previous dikes and earthquakes, suggesting that stress transfer plays an important role in controlling subsurface magma accumulation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Amelung, Falk -- Yun, Sang-Ho -- Walter, Thomas R -- Segall, Paul -- Kim, Sang-Wan -- New York, N.Y. -- Science. 2007 May 18;316(5827):1026-30.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Rosenstiel School of Marine and Atmospheric Sciences, University of Miami, 4600 Rickenbacker Causeway, Miami, FL 33149, USA. famelung@rsmas.miami.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17510364" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 7
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    Rebuilding Haiti smarter (2010)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 2010-03-13
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Dixon, Tim -- Amelung, Falk -- Harrison, Chris -- Wdowinksi, Shimon -- Lin, Guoqing -- New York, N.Y. -- Science. 2010 Mar 12;327(5971):1325. doi: 10.1126/science.327.5971.1325-a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20223968" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 8
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    Postseismic mantle relaxation in the Central Nevada Seismic Belt (2005)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 2005-12-03
    Description: Holocene acceleration of deformation and postseismic relaxation are two hypotheses to explain the present-day deformation in the Central Nevada Seismic Belt (CNSB). Discriminating between these two mechanisms is critical for understanding the dynamics and seismic potential of the Basin and Range province. Interferometric synthetic aperture radar detected a broad area of uplift (2 to 3 millimeters per year) that can be explained by postseismic mantle relaxation after a sequence of large crustal earthquakes from 1915 to 1954. The results lead to a broad agreement between geologic and geodetic strain indicators and support a model of a rigid Basin and Range between the CNSB and the Wasatch fault.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Gourmelen, Noel -- Amelung, Falk -- New York, N.Y. -- Science. 2005 Dec 2;310(5753):1473-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Division of Marine Geology and Geophysics, Rosenstiel School of Marine and Atmospheric Sciences, University of Miami, Miami, FL 33149, USA. ngourmelen@rsmas.miami.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16322452" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 9
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    Characterization of open and closed volcanic systems in Indonesia and Mexico using InSAR time-series (2013)
    Wiley
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    Publication Date: 2013-07-20
    Description: [1]  We use 2007-2011 ALOS SAR data to perform an arc-wide Interferometric Synthetic Aperture Radar (InSAR) time-series survey of the Trans-Mexican Volcanic Belt (TMVB), and to study time-dependent ground deformation of four Indonesian volcanoes selected following the 2007-2009 study of Chaussard and Amelung [2012]. Our objectives are to examine whether arc volcanoes exhibit long-term edifice-wide cyclic deformation patterns that can be used to characterize open and closed volcanic systems and to better constrain in which cases precursory inflation is expected. We reveal deformation cycles at both regularly active and previously inactive Indonesian volcanoes but we do not detect deformation in the TMVB, reflecting a lower activity level. We identify three types of relationships between deformation and activity: inflation prior to eruption and associated with or followed by deflation (Kerinci and Sinabung); inflation without eruption and followed by slow deflation (Agung); and eruption without precursory deformation (Merapi, Colima, and Popocatépetl; at Merapi no significant deformation is detected even during eruption). The first two cases correspond to closed volcanic systems and suggest that the traditional model of magmatic systems and eruptive cycles do apply to andesitic volcanoes (i.e. inflation and deflation episodes associated with magma accumulation or volatile exsolution in a crustal reservoir followed by eruptions or in-situ cooling). In contrast, the last case corresponds to open volcanic systems where no significant pressurization of the magmatic reservoirs is taking place prior to eruptions and thus no long-term edifice-wide ground deformation can be detected. We discuss these results in terms of InSAR's potential for forecasting volcanic unrest.
    Print ISSN: 0148-0227
    Topics: Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 10
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    On the lack of InSAR observations of magmatic deformation at Central American volcanoes (2013)
    Wiley
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    Publication Date: 2013-04-27
    Description: [1]  A systematic survey of three years of L-band InSAR measurements of the Central American Volcanic Arc shows a striking lack of magmatic deformation. We make measurements at 20 of the 26 historically active volcanoes and demonstrate that none were deforming magmatically (2007–2010), although we do measure shallow subsidence associated with flow deposits and edifice loading at three volcanoes. The minimum detection rates for our survey, as estimated from the variance in time series of radar path delay, are relatively high due to strong variability of tropospheric water vapour. We compare the average detection threshold (2.4 cm/yr) to published InSAR measurements and show that the majority (∼ 78%) of deformation events would have been measurable with the same level of noise as Central America. We calculate that if magmatic volcano deformation were spread evenly across historically active volcanoes worldwide, the probability of none of Central America's 26 volcanoes deforming would be 〈 1%. The lack of magmatic deformation in Central America may be indicative of differences in magma storage relative to other well-studied continental arcs. The high proportion of basalts that ascend directly from depth relative to andesites stored in the shallow crust may limit potential for high magnitude deformation. Magma stored in vertically elongated reservoir and high parental melt volatile contents that result in bubble-rich, compressible magmas at shallow depths may also reduce surface deformation. We consider the measurement and analysis of a lack of deformation at active volcanoes to be essential for realising the potential of regional-scale InSAR surveys.
    Print ISSN: 0148-0227
    Topics: Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
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