Ground Deformation Between 2002 and 2013 from InSAR Observations

Vélez, María Laura; Euillades, Pablo A.; Blanco, M.; Euillades, Leonardo

doi:10.1007/978-3-662-48005-2_8

Cited by 16 publications

(21 citation statements)

References 25 publications

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“…In order to reduce a positive residual on the volcano's northern flank, Velez et al . [] added a conduit that they approximated by a high aspect ratio, prolate, inclined spheroid. Their best fit conduit solution was located at 2 km depth beneath the edifice.…”

Section: Discussionmentioning

confidence: 55%

“…The main difference between the Velez et al . [] solution and ours lies in the inclined orientation of our deeper source and the greater depth separation between their sources. It is also worth noting that their volume change ( δV ), the amount the surrounding medium deforms for a change in pressure within their source volume [see Nikkhoo et al ., , equation (10)], for the 2011.75–2012.25 (half‐year) interval for their two‐source solution ( δV = 0.050 km 3 /yr if assumed a rate) is considerably larger than our two‐source pCDM potency change (Δ V ) solution (Table S1) for the 2013–2014 interval (Δ V = 0.029 km 3 /yr), even though the LOS rates in the ascending tracks were similar (~8 cm/yr).…”

Section: Discussionmentioning

confidence: 56%

“…Velez et al . [] preferred the spheroidal source solution since the sill‐like dislocation source extended beyond the edifice into the caldera. In order to reduce a positive residual on the volcano's northern flank, Velez et al .…”

Section: Discussionmentioning

confidence: 99%

“…They found solutions located between 7.5 and 9 km beneath the surface for the current unrest, with the shallower depth found for the point and spheroid sources and the deeper one found for the tensile dislocation (sill) source. Velez et al [2016] preferred the spheroidal source solution since the sill-like dislocation source extended beyond the edifice into the caldera. In order to reduce a positive residual on the volcano's northern flank, Velez et al [2016] added a conduit that they approximated by a high aspect ratio, prolate, inclined spheroid.…”

Section: Journal Ofmentioning

confidence: 99%

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Source model for the Copahue volcano magma plumbing system constrained by InSAR surface deformation observations

et al. 2017

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Copahue volcano straddling the edge of the Agrio‐Caviahue caldera along the Chile‐Argentina border in the southern Andes has been in unrest since inflation began in late 2011. We constrain Copahue's source models with satellite and airborne interferometric synthetic aperture radar (InSAR) deformation observations. InSAR time series from descending track RADARSAT‐2 and COSMO‐SkyMed data span the entire inflation period from 2011 to 2016, with their initially high rates of 12 and 15 cm/yr, respectively, slowing only slightly despite ongoing small eruptions through 2016. InSAR ascending and descending track time series for the 2013–2016 time period constrain a two‐source compound dislocation model, with a rate of volume increase of 13 × 106 m3/yr. They consist of a shallow, near‐vertical, elongated source centered at 2.5 km beneath the summit and a deeper, shallowly plunging source centered at 7 km depth connecting the shallow source to the deeper caldera. The deeper source is located directly beneath the volcano tectonic seismicity with the lower bounds of the seismicity parallel to the plunge of the deep source. InSAR time series also show normal fault offsets on the NE flank Copahue faults. Coulomb stress change calculations for right‐lateral strike slip (RLSS), thrust, and normal receiver faults show positive values in the north caldera for both RLSS and normal faults, suggesting that northward trending seismicity and Copahue fault motion within the caldera are caused by the modeled sources. Together, the InSAR‐constrained source model and the seismicity suggest a deep conduit or transfer zone where magma moves from the central caldera to Copahue's upper edifice.

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Section: Discussionmentioning

confidence: 55%

Section: Discussionmentioning

confidence: 56%

Section: Discussionmentioning

confidence: 99%

Section: Journal Ofmentioning

confidence: 99%

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Source model for the Copahue volcano magma plumbing system constrained by InSAR surface deformation observations

et al. 2017

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“…Uplift preceding eruption can be of long duration (e.g., 6 years before the 2011 eruption of Hudson, Delgado et al, 2014), or continue after an eruption has taken place (c.f. 2012 phreatic eruption at Copahue, Velez et al, 2016). There are a growing number of observations of episodes of uplift occurring both months and years before the onset of eruption: the 2010 eruption of Eyjafjallajökull tapped sills both emplaced gradually in the three months before eruption, and a decade earlier .…”

Section: Pre-eruptive Deformationmentioning

confidence: 99%

Synthesis of global satellite observations of magmatic and volcanic deformation: implications for volcano monitoring & the lateral extent of magmatic domains

et al. 2018

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Global Synthetic Aperture Radar (SAR) measurements made over the past decades provide insights into the lateral extent of magmatic domains, and capture volcanic process on scales useful for volcano monitoring. Satellite-based SAR imagery has great potential for monitoring topographic change, the distribution of eruptive products and surface displacements (InSAR) at subaerial volcanoes. However, there are challenges in applying it routinely, as would be required for the reliable operational assessment of hazard. The deformation detectable depends upon satellite repeat time and swath widths, relative to the spatial and temporal scales of volcanological processes. We describe the characteristics of InSAR-measured volcano deformation over the past two decades, highlighting both the technique's capabilities and its limitations as a monitoring tool. To achieve this, we draw on two global datasets of volcano deformation: the Smithsonian Institution Volcanoes of the World database and the Centre for the Observation and Modelling of Earthquakes, Volcanoes and Tectonics volcano deformation catalogue, as well as compiling some measurement characteristics and interpretations from the primary literature. We find that a higher proportion of InSAR observations capture non-eruptive and non-magmatic processes than those from ground-based instrument networks, and that both transient (< month) and long-duration (> 5 years) deformation episodes are under-represented. However, satellite radar is already used to assess the development of extended periods of unrest and long-lasting eruptions, and improved spatial resolution and coverage have resulted in the detection of previously unrecognised deformation at both ends of the spatial scale (~10 to > 1000 km 2 ). 'Baseline' records of past InSAR measurements, including 'null' results, are fundamental for any future interpretation of interferograms in terms of hazard‚ both by providing information about past deformation at an individual volcano, and for assessing the characteristics of deformation that are likely to be detectable (and undetectable) using InSAR. More than half of all InSAR deformation signals attributed to magmatic processes have sources in the shallow crust (< 5 km depth). While the depth distribution of InSAR-derived deformation sources is affected by measurement limitations, their lateral distribution provides information about the extent of active magmatic domains. Deformation is common (24% of all potentially magmatic events) at loci ≥5 km away from the nearest active volcanic vent. This demonstrates that laterally extensive active magmatic domains are not exceptional, but can comprise the shallowest part of trans-crustal magmatic systems in a range of volcanic settings.

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The 2020 eruption and the large lateral dike emplacement at Taal volcano, Philippines: Insights from radar satellite data

Bato

Lundgren

Pinel

et al. 2020

Preprint

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Taal volcano is a caldera located in southwestern Luzon island in the Philippines (Figure 1). It is one of the frequently erupting volcanoes in the country, having at least 33 known historical eruptions between CE1572 and CE1977 (Delos Reyes et al., 2018). The volcano is part of the Macolod Corridor, a complex NE-SW trending 50-60 km-wide rift zone, characterized by active volcanism, crustal thinning, extensive faulting, and block rotation (

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Ground Deformation Between 2002 and 2013 from InSAR Observations

Cited by 16 publications

References 25 publications

Source model for the Copahue volcano magma plumbing system constrained by InSAR surface deformation observations

Source model for the Copahue volcano magma plumbing system constrained by InSAR surface deformation observations

Synthesis of global satellite observations of magmatic and volcanic deformation: implications for volcano monitoring & the lateral extent of magmatic domains

The 2020 eruption and the large lateral dike emplacement at Taal volcano, Philippines: Insights from radar satellite data

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