Ground deformation monitoring of a potential landslide at La Palma, Canary Islands

Moss, Jane Louise; McGuire, William; Page, David P.

doi:10.1016/s0377-0273(99)00106-7

Cited by 43 publications

(24 citation statements)

References 18 publications

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“…7) is the absence of deformation in the northern section affecting the Cumbre Vieja volcano in its entirety. There has recently been discussion of a potential detachment surface beneath this ridge that has the possibility to create a landslide (MOSS et al, 1999;DAY et al, 1999). Differential InSAR tends to be more sensitive to vertical motion, but will still detect a projection of the horizontal motion in the LOS.…”

Section: Resultsmentioning

confidence: 99%

Time Evolution of Deformation Using Time Series of Differential Interferograms: Application to La Palma Island (Canary Islands)

Perlock

González²,

Tiampo

et al. 2008

Pure appl. geophys.

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Differential interferometry is a very powerful tool for detecting changes in the Earth's crust where coherence conditions are good, but is difficult to employ in some volcanic areas due to dense vegetation. We apply two differential InSAR methods using the time series associated with the interferograms to perform a phase analysis on a data set for La Palma island (Canary Islands) from the ERS-1 and ERS-2 European Space Agency (ESA) satellites for the time period 1992 to 2000. Both methods involve choosing a master image from the database and creating a series of interferograms with respect to this image. The ''Coherent Pixel Time Series'' (CPTS) technique chooses pixels with good average coherence, aligns the unwrapped interferograms with a stable area and then performs an inversion to calculate the linear velocity to quantify the deformation. The Coherent Target Modeling (CTM) method calculates the temporal coherence of each pixel to identify stable targets and then determines the best velocity for each pixel by using a linear fit that maximizes the temporal coherence. Using these two methods we have been able to detect deformation on La Palma Island that has been previously undetectable by conventional InSAR methods. There is a roughly circular region on the Southern part of the island that is actively deforming at *-4 to -8 mm/yr. This region is located near the Teneguia valcano, the host of the last known eruption on La Palma in 1971. A thorough investigation of the possible sources for this deformation revealed that it was most likely created by a subsurface thermal source.

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Section: Resultsmentioning

confidence: 99%

Time Evolution of Deformation Using Time Series of Differential Interferograms: Application to La Palma Island (Canary Islands)

Perlock

González²,

Tiampo

et al. 2008

Pure appl. geophys.

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“…In 2000 and 2001, this island became very famous among scientists and general society due to the publication of several articles (Moss et al, 1999;Day et al, 1999;Ward and Day, 2001), and the consequent appearance in the media of related news, which warned that a giant collapse affecting the western flank of the southern part of the island would generate a tsunami that could affect coastal areas around the North and Central Atlantic basin, although not all scientific researchers agree with this (e.g., Carracedo et al, 2009).…”

Section: Measurement Of Deformation and Gravity Changesmentioning

confidence: 99%

“…To assess the level of stability of the western flank of Cumbre Vieja (Moss et al, 1999), in the mid-1990s a geodetic network was installed and was used three times between [1994][1995][1996][1997] utilizing Electronic Distance Measurement techniques (EDM) and Rapid-Static GPS . However, these studies were limited in their spatial extension and temporal coverage.…”

Section: Measurement Of Deformation and Gravity Changesmentioning

confidence: 99%

“…In addition, the mean square root of the residuals with respect to the linear model for all times series is of the order of ∼±1 mm/year. 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 catastrophic works published on the likelihood and possible effects of a landslide on the Island of La Palma (Moss et al, 1999;Day et al, 1999;Ward and Day, 2001) …”

Section: Measurement Of Deformation and Gravity Changesmentioning

confidence: 99%

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An Overview of Geodetic Volcano Research in the Canary Islands

Fernández

González

Camacho

et al. 2014

Pure Appl. Geophys.

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“…At the beginning of the 21st century, a public debate opened about the possible future giant collapse affecting the western flank of the southern part of La Palma and consequent tsunami generation that could affect coastal areas around the North and Central Atlantic basin WARD and DAY, 2001). To assess the level of stability of the western flank of Cumbre Vieja, in the mid-1990s a geodetic network was installed and was used three times utilizing Electronic Distance Measurement techniques (EDM) and Rapid-Static GPS (between 1994, however, these studies were limited in their spatial extension and temporal coverage (MOSS et al, 1999). The results showed a coherent pattern of displacement vectors, but they were of the same order of magnitude as the associated errors.…”

Section: Previous Geodetic Studiesmentioning

confidence: 99%

Geodetic and Structural Research in La Palma, Canary Islands, Spain: 1992–2007 Results

Prieto

González²,

Seco

et al. 2009

Pure appl. geophys.

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We review the results of the geodetic and structural studies carried out on La Palma Island using geodetic and geophysical data during the period 1992-2007. InSAR and GPS observation techniques were applied to study the existence of deformation on the island and gravity observations were carried out for structural studies. Gravity data were inverted using a nonlinear three-dimensional gravity inversion approach to obtain the geometry of the anomalous bodies constructed in a random growth process with respect to an exponentially stratified background. The main structural feature is a large central body (under the Caldera de Taburiente) with high density, which was interpreted as the Pliocene-age uplifted seamount and a relatively dense intrusive plutonic complex/magma body. The Cumbre Vieja series is characterized by elongated minima distributed according to the rift structure. InSAR results show a clear subsidence located on the Teneguı´a volcano, where the last eruption took place in 1971. A thermal source is the most probable origin for this deformation. A GPS network composed of 26 stations covering the total island surface was set up. Vertical displacements determined comparing the GPS coordinates obtained in 2007 with coordinates determined in 1994 are consistent with the InSAR results obtained in the southern part of the island. This is not the case for the northern part. From the comparison of 2006 and 2007 coordinates it is clear that more time is needed to obtain significant displacements, but observed trends are also consistent with InSAR results. All the observed significant displacements are in stations located outside of the large high-density central body.

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Ground deformation monitoring of a potential landslide at La Palma, Canary Islands

Cited by 43 publications

References 18 publications

Time Evolution of Deformation Using Time Series of Differential Interferograms: Application to La Palma Island (Canary Islands)

Time Evolution of Deformation Using Time Series of Differential Interferograms: Application to La Palma Island (Canary Islands)

An Overview of Geodetic Volcano Research in the Canary Islands

Geodetic and Structural Research in La Palma, Canary Islands, Spain: 1992–2007 Results

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