New Results at Mayon, Philippines, from a Joint Inversion of Gravity and Deformation Measurements

Tiampo, K. F.; Fernández, José; Jentzsch, G.; Charco, María; Rundle, John B.

doi:10.1007/978-3-0348-7897-5_9

Cited by 12 publications

(21 citation statements)

References 31 publications

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“…This model is based on a redistribution of the mass via the migration of magma down the vent system and can explain about 50% of the magnitude and distribution of the observed gravity changes. FERNA´NDEZ et al (2001) and TIAMPO et al (2004a) used a genetic algorithm for an inversion based on an Vol. 164, 2007 Interpretation of Gravity Changes around Mayon elastic-gravitational model, which introduces a long-wavelength effect and can combine the gravity and deformation fields.…”

Section: Gravity Data Fit and Inversion Approachmentioning

confidence: 99%

“…An inversion process, prompted the evacuation of 60,000 others. The volcano erupted again in 2000(JENTZSCH et al, 2004TIAMPO et al, 2004a).…”

Section: Introductionmentioning

confidence: 99%

“…Nevertheless, the mean accuracy of 9.4 Gal assumed for the gravity data does not permit better discrimination between the models considered, which (except for model A in Table 2 that only considers constant variation in vertical displacement and gravity change and no mass and/or pressure changes) produce residuals smaller than this accuracy threshold. TIAMPO et al (2004a), working with the entire set of stations and using a genetic algorithm as inversion method, obtained shallower sources. We conclude, however, that the point-source inversion suggests a discontinuity phenomenon whose consideration as a model of the San Vicente-Linao Fault provides an optimal fit of the Mayon data, using one very plausible source.…”

mentioning

confidence: 99%

“…'W' means a source located far west of the summit, 'C' (residuals of about 6 lGal) (seeFig. 5) TIAMPO et al (2004a). also considered a two-source model, but the inferred sources were at depth of 1 km and 200 m. These shallow sources, hypothesized to be magmatic and hydrothermal respectively, resolve the local gravity changes on different wavelengths.…”

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confidence: 99%

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Interpretation of 1992–1994 Gravity Changes around Mayon Volcano, Philippines, Using Point Sources

Camacho¹,

Fernández²,

Charco³

et al. 2007

Pure appl. geophys.

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Significant gravity changes observed around the Mayon Volcano (Philippines) between 1992 and 1994 at 26 stations are interpreted in terms of an increase of mass and pressure changes at several point sources modelled using a fast inversion process. This inversion approach attempts to fit gravity and elevation changes by combining a random search for the positions of the sources and a linear least-squares fit for the incremental mass, pressure and possible common regional values for gravity or elevation changes. Some stabilizer terms are included in the misfit function. Models with one and two sources were tested against the observed changes at Mayon. Models with only one-source give a best fit for a shallow source with a positive mass increment, horizontally displaced far from the summit. The study using two sources gives a best fit that is similar to the one-source model, but in addition indicates anomalous behavior at stations in the SW. Neglecting the stations located southward from a local fracture, the bestfitting model suggests one central positive mass change source, which is likely to be an intrusion of about 0.5 MU with a depth of about 5 km beneath the volcano. Standard deviation for the residuals ranges from 7-8 lGal for one-source models to 6-7 lGal for models with two sources. Both of the cases are below the error value of 9.4 lGal estimated for the gravity data, so that it is not possible to discriminate between both possible interpretations without additional information.

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Section: Gravity Data Fit and Inversion Approachmentioning

confidence: 99%

“…An inversion process, prompted the evacuation of 60,000 others. The volcano erupted again in 2000(JENTZSCH et al, 2004TIAMPO et al, 2004a).…”

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Interpretation of 1992–1994 Gravity Changes around Mayon Volcano, Philippines, Using Point Sources

Camacho¹,

Fernández²,

Charco³

et al. 2007

Pure appl. geophys.

Self Cite

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“…Second, the incorporation of the elastic-gravitational effect introduces a long-wavelength effect to the gravity and deformation field that might prove important in an area with significant topography. Finally, with the correct combination of mass, pressure, and radius, inside a volcano that likely contains a complicated, preexisting vent system, it is possible to model the unusual measurements recorded at Mayon and originally presented in TIAMPO et al (2004).…”

Section: Introductionmentioning

confidence: 99%

Modeling of Stress Changes at Mayon Volcano, Philippines

Tiampo

Fernández²,

Jentzsch³

2007

Pure appl. geophys.

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In this paper, we analyze the stress change associated with the inverted volcanic source models at Mayon volcano, Philippines, where there are gravity changes without significant deformation after the 1993 eruption. We detail the applicable data and the associated inversion techniques and models prior to calculating the appropriate stress changes. It is determined that the stress change associated with the central magmatic source produces compressional stress changes at a secondary source to the northwest, prompting a change in the local water storage in the underlying fractured rock.

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GEOFIM: A WebGIS application for integrated geophysical modeling in active volcanic regions

Currenti

Napoli

Sicali

et al. 2014

Computers & Geosciences

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New Results at Mayon, Philippines, from a Joint Inversion of Gravity and Deformation Measurements

Cited by 12 publications

References 31 publications

Interpretation of 1992–1994 Gravity Changes around Mayon Volcano, Philippines, Using Point Sources

Interpretation of 1992–1994 Gravity Changes around Mayon Volcano, Philippines, Using Point Sources

Modeling of Stress Changes at Mayon Volcano, Philippines

GEOFIM: A WebGIS application for integrated geophysical modeling in active volcanic regions

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