A new algorithm for modelling simple and double Mogi magma sources in active volcanoes: accuracy, sensitivity, limitations and implications

Saltogianni, Vasso; Stiros, Stathis C.

doi:10.1007/s00445-013-0754-x

Cited by 6 publications

(19 citation statements)

References 42 publications

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“…This indicates that the underlying magmatic process cannot be explained by expansion and/or contraction of one or of two‐point spherical sources, and the algorithm adopted can identify cases not leading to a solution and hence tends to avoid “false alarms” [cf. Saltogianni and Stiros , ].…”

Section: Resultsmentioning

confidence: 99%

“…Furthermore, the topography in Santorini is essentially smooth and does not a priori exclude elastic modeling [ Cayol and Cornet , ; Williams and Wadge , ; Lundgren et al ., ; Masterlark , ], an effect already confirmed by the use of synthetic data [ Saltogianni and Stiros , ].…”

Section: Resultsmentioning

confidence: 99%

“…As noted above and analyzed in Saltogianni and Stiros [], we conclude to a “nested grid” solution by making the inversion in steps for all variables by using a gradually smaller and finer grid. This was necessary in the case of modeling a double source, where the unknown variables are 8 and the number of grid points tends to become very large.…”

Section: Discussionmentioning

confidence: 99%

“…TOPINV can also be adopted for modeling of the deformation produced by two magma sources [Saltogianni and Stiros, 2013b]. In this case, x and grid G are combined in R 8 space whose four-dimensions correspond to each of the two Mogi sources.…”

Section: Methodsmentioning

confidence: 99%

“…This indicates that the underlying magmatic process cannot be explained by expansion and/or contraction of one or of two-point spherical sources, and the algorithm adopted can identify cases not leading to a solution and hence tends to avoid "false alarms" [cf. Saltogianni and Stiros, 2013b]. A possibility is that P5 reflects partial viscoelastic relaxation, a problem that is beyond the scope of this work, or that displacements during this period were too small, equal to, or even below the level of uncertainty of geodetic measurements to permit a safe modeling.…”

Section: The Problem Of Periodmentioning

confidence: 95%

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Time‐space modeling of the dynamics of Santorini volcano (Greece) during the 2011–2012 unrest

et al. 2014

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The 2011-2012 unrest of Santorini (Thera) volcano (Aegean Sea, Greece) was associated with microseismicity confined to the Kameni Line (KL), a major tectonovolcanic lineament, and has been regarded as a single magmatic episode, produced by a spherical source derived from inversion of GPS data. However, such a source is a few kilometers away from the KL and cannot explain observed microseismicity. For this reason, we divided the unrest episode into five periods based on the fluctuations of seismicity and deformation rates and investigated the connection between seismicity and two spherical magmatic point sources for each period. Based on a new inversion algorithm and consistent GPS data, we recognized during the volcano unrest episode an unstable pattern of intrusions correlating with both the KL and Columbo Line (CL), a second major tectonovolcanic lineament. Intrusions correlating with CL appear relatively persistent, aseismic, small, and shallow, which is consistent with marine geophysical evidence for arrested shallow dykes and geodetic evidence from a previous inflation episode. During the two periods of intense seismicity, sources close to the KL, explaining seismicity, were obtained. This unstable pattern of intrusions explains both the well-observed location and timing of seismicity as well as ground deformation and is consistent with results of an Okada-type inversion for a sill and a dyke. The stress interactions between the two sources agree with Coulomb failure stress models. Santorini appears to be affected by concurrent offset magma pulses, and only recent activity from a magma pulse below the KL produced microseismic swarms.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: The Problem Of Periodmentioning

confidence: 95%

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Time‐space modeling of the dynamics of Santorini volcano (Greece) during the 2011–2012 unrest

et al. 2014

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Spatiotemporal gravity changes at the Santorini Volcanic complex and their interpretation

Paraskevas,

Paradissis,

Hooft

et al. 2024

Quaternary Science Advances

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The Method of Fundamental Solutions for Solving the Inverse Problem of Magma Source Characterization

Yazdanparast

Voosoghi

Mossaiby

2019

Geomatics, Natural Hazards and Risk

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Volcano is one of the geodynamic phenomena causing irreparable damages. As lava accumulates in reservoir and then comes to the surface, geometry of the source can be used to predict volcanic eruptions. In this study, using the inverse method of fundamental solutions (MFS) and taking into account the effect of topography, the geometry of the source including shape, depth and centre position of the magma tank is estimated. The MFS is a numerical method for solving boundary value problems with known partial differential equations. The displacement field calculated in the previous studies using InSAR for deflation mode of Cerro Blanco volcano was utilized in this study. It was estimated that the magma source of the volcano is a sphere with a radius of 1 km located at a horizontal position of (1:00164eÀ6; À1:00161eÀ6) km and the depth of about 10 km from the summit with respect to the defined coordinate system. This finding is consistent with that of recent studies in which inversion of InSAR data was used to analyse the geometry of the magma source. The RMSE between the deformation fields of the magma source calculated in the previous studies and that of the study herein via MFS was approximately 3 mm.

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A new algorithm for modelling simple and double Mogi magma sources in active volcanoes: accuracy, sensitivity, limitations and implications

Cited by 6 publications

References 42 publications

Time‐space modeling of the dynamics of Santorini volcano (Greece) during the 2011–2012 unrest

Time‐space modeling of the dynamics of Santorini volcano (Greece) during the 2011–2012 unrest

Spatiotemporal gravity changes at the Santorini Volcanic complex and their interpretation

The Method of Fundamental Solutions for Solving the Inverse Problem of Magma Source Characterization

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