Volcano deformation survey over the Northern and Central Andes with ALOS InSAR time series

Rivera, A. M. Morales; Amelung, F.; Mothes, Patricia

doi:10.1002/2016gc006393

Cited by 29 publications

(15 citation statements)

References 69 publications

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“…Areas outside the 6 × 4 km El Reventador crater are almost entirely incoherent, while recent less-vegetated lava flows within the crater, up to 4 km from the active vent, are much more coherent. The flows show subsidence associated with cooling and compaction of the blocky lavas, a result previously observed in ALOS data from 2007 to 2011 (Fournier et al, 2010;Rivera Morales et al, 2016;Naranjo et al, 2016). The combined effect of lava subsidence in the near-field and incoherence in the far-field masks almost all potential edifice-wide ground deformation due to magmatic or hydrothermal processes underneath El Reventador.…”

Section: Differential Interferometrysupporting

confidence: 60%

Decaying Lava Extrusion Rate at El Reventador Volcano, Ecuador, Measured Using High‐Resolution Satellite Radar

et al. 2017

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Lava extrusion at erupting volcanoes causes rapid changes in topography and morphology on the order of tens or even hundreds of meters. Satellite radar provides a method for measuring changes in topographic height over a given time period to an accuracy of meters, either by measuring the width of radar shadow cast by steep sided features, or by measuring the difference in radar phase between two sensors separated in space. We measure height changes, and hence estimate extruded lava volume flux, at El Reventador, Ecuador, between 2011 and 2016, using data from the RADARSAT‐2 and TanDEM‐X satellite missions. We find that 39 new lava flows were extruded between 9 February 2012 and 24 August 2016, with a cumulative volume of 44.8M m3 dense rock equivalent and a gradually decreasing eruption rate. The average dense rock rate of lava extrusion during this time is 0.31 ± 0.02 m3 s−1, which is similar to the long‐term average from 1972 to 2016. Apart from a volumetrically small dyke opening event between 9 March and 10 June 2012, lava extrusion at El Reventador is not accompanied by any significant magmatic ground deformation. We use a simple physics‐based model to estimate that the volume of the magma reservoir under El Reventador is greater than 3 km3. Our lava extrusion data can be equally well fit by models representing a closed reservoir depressurising during the eruption with no magma recharge, or an open reservoir with a time‐constant magma recharge rate of up to 0.35 ± 0.01 m3 s−1.

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Section: Differential Interferometrysupporting

confidence: 60%

Decaying Lava Extrusion Rate at El Reventador Volcano, Ecuador, Measured Using High‐Resolution Satellite Radar

et al. 2017

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“…Deformation data provided by (a). Morales from the point 1.2275, −77.3486 (Morales Rivera et al, ) these data have high uncertainties due primarily to the variability of atmospheric water vapor in tropical regions (Ebmeier et al, , ). Red lines have been added to this figure to signify the timing of three VEI 3 eruptions.…”

Section: Discussionmentioning

confidence: 99%

Thermal, Deformation, and Degassing Remote Sensing Time Series (CE 2000–2017) at the 47 most Active Volcanoes in Latin America: Implications for Volcanic Systems

et al. 2019

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Volcanoes are hazardous to local and global populations, but only a fraction are continuously monitored by ground-based sensors. For example, in Latin America, more than 60% of Holocene volcanoes are unmonitored, meaning long-term multiparameter data sets of volcanic activity are rare and sparse. We use satellite observations of degassing, thermal anomalies, and surface deformation spanning 17 years at 47 of the most active volcanoes in Latin America and compare these data sets to ground-based observations archived by the Global Volcanism Program. This first comparison of multisatellite time series on a regional scale provides information regarding volcanic behavior during, noneruptive, pre-eruptive, syneruptive, and posteruptive periods. For example, at Copahue volcano, deviations from background activity in all three types of satellite measurements were manifested months to years in advance of renewed eruptive activity in 2012. By quantifying the amount of degassing, thermal output, and deformation measured at each of these volcanoes, we test the classification of these volcanoes as open or closed volcanic systems. We find that~28% of the volcanoes do not fall into either classification, and the rest show elements of both, demonstrating a dynamic range of behavior that can change over time. Finally, we recommend how volcano monitoring could be improved through better coordination of available satellite-based capabilities and new instruments.

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“…-19-ESSOAr | https://doi.org/10.1002/essoar.10501561.1 | Non-exclusive | First posted online: Sat, 4 Jan 2020 03:29:38 | This content has not been peer reviewed. Figure 3a) derived from ERS [Pritchard and Simons, 2004;Jay, 2014], ENVISAT [Jay, 2014;Jay et al, 2015], ALOS [Morales Rivera et al, 2016], TSX [Reath et al, 2019a], and S1 (this study) data. Note that although this time series mixes ascending and descending data, the point at Sabancaya is chosen such that the amplitude of the uplift signal is as close as possible between ascending and descending.…”

Section: Timeline Of Activity At Sabancayamentioning

confidence: 96%

Volcano-tectonic interactions at Sabancaya volcano, Peru: eruptions, magmatic inflation, moderate earthquakes, and fault creep

MacQueen

Delgado

Reath

et al. 2020

Preprint

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Volcano deformation survey over the Northern and Central Andes with ALOS InSAR time series

Cited by 29 publications

References 69 publications

Decaying Lava Extrusion Rate at El Reventador Volcano, Ecuador, Measured Using High‐Resolution Satellite Radar

Decaying Lava Extrusion Rate at El Reventador Volcano, Ecuador, Measured Using High‐Resolution Satellite Radar

Thermal, Deformation, and Degassing Remote Sensing Time Series (CE 2000–2017) at the 47 most Active Volcanoes in Latin America: Implications for Volcanic Systems

Volcano-tectonic interactions at Sabancaya volcano, Peru: eruptions, magmatic inflation, moderate earthquakes, and fault creep

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