Mayon volcano, Philippines: change of monitoring strategy after microgravity and GPS measurements from 1992 to 1996

Jentzsch, G.; Punongbayan, Raymondo S.; Schreiber, Ulrich; Seeber, Günter; Völksen, Christof; Weise, A.

doi:10.1016/s0377-0273(00)00313-9

Cited by 33 publications

(54 citation statements)

References 13 publications

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“…Table 1 shows the observed gravity changes N94-N92 considered for the source modelling. The a priori mean standard deviation for the gravity data in Table 1 is 9.4 lGal, but a more realistic value of 12 lGal is suggested by JENTZSCH et al (2001). Apart from considering one or several sources (positive and/or negative), a uniform change for seasonal variations and the effect of a laminar body can be tested.…”

Section: Resultsmentioning

confidence: 99%

“…G. Camacho et al Pure appl. geophys., Table 2 Some results for the fit of seven possible models ( The data accuracy level (12 lGal according to JENTZSCH et al, 2001) does not allow us to distinguish between the models. Nevertheless, interesting conclusions can be drawn from the source models.…”

Section: Resultsmentioning

confidence: 99%

“…JAHR et al (1998) andJENTZSCH et al (2001) suggested that the gravity changes can be explained in terms of density changes within a vent system. 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.…”

Section: Gravity Data Fit and Inversion Approachmentioning

confidence: 99%

“…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. JENTZSCH et al (2001) considered the effects of changes in the groundwater level or soil moisture for tropical regions. For instance, for a porosity of 50%, a 50% change in the filling of the pore space produces a maximum attraction effect of 42 lGal.…”

Section: Gravity Data Fit and Inversion Approachmentioning

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: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Gravity Data Fit and Inversion Approachmentioning

confidence: 99%

Section: Gravity Data Fit and Inversion Approachmentioning

confidence: 99%

See 2 more Smart Citations

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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“…The Mogi model has been extensively applied in modeling ground deformations in volcanic areas and has been successful primarily in explaining the vertical component of the ground deformations. However, this model often poses difficulties in simultaneously modeling all components of the observed displacements in conjunction with gravity changes (KISSLINGER, 1975;RYMER et al, 1993;RYMER, 1996), and there is a large body of evidence for ground deformations and seismicity at calderas and other volcanic areas that cannot be modeled by these purely elastic effects (e.g., EGGERS, 1987;BERRINO and CORRADO, 1991;BONAFEDE, 1991;RYMER et al, 1993;DE NATALE et al, 1997;GAETA et al, 1998;JAHR et al, 1998;WATANABE et al, 1998;JENTZSCH et al, 2001b;PRITCHARD and SIMONS, 2002).…”

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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The Influence of Plumbing System Structure on Volcano Dimensions and Topography

2017

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Volcano morphology has been traditionally studied from a descriptive point of view, but in this work we took a different more quantitative perspective. Here we used volcano dimensions such as height and basal radius, together with the topographic profile as indicators of key plumbing system properties. We started by coupling models for the ascent of magma and extrusion of lava flows with those for volcano edifice construction. We modeled volcanic edifices as a pile of lavas that are emitted from a single vent and reduce in volume with time. We then selected a number of arc‐volcano examples to test our physical relationships and estimate parameters, which were compared with independent methods. Our results indicate that large volcanoes (>2,000 m height and base radius >10 km) usually are basaltic systems with overpressured sources located at more than 15 km depth. On the other hand, smaller volcanoes (<2,000 m height and basal radius <10 km) are associated with more evolved systems where the chambers feeding eruptions are located at shallower levels in the crust (<10 km). We find that surface observations on height and basal radius of a volcano and its lavas can give estimates of fundamental properties of the plumbing system, specifically the depth and size of the magma chamber feeding eruptions, as the structure of the magmatic system determines the morphology of the volcanic edifice.

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Mayon volcano, Philippines: change of monitoring strategy after microgravity and GPS measurements from 1992 to 1996

Cited by 33 publications

References 13 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

The Influence of Plumbing System Structure on Volcano Dimensions and Topography

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