Source location of long period seismicity at Volcàn de Colima, México

Petrosino, Simona; Cusano, Paola; Rocca, Mario La; Galluzzo, Danilo; Orozco-Rojas, Justo; Bretón, Mauricio; Ibáñez, Jesús M.; Pezzo, E. Del

doi:10.1007/s00445-011-0447-2

Cited by 22 publications

(19 citation statements)

References 27 publications

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“…Analysis of the spectral properties of long-period volcanic earthquakes by Petrosino et al (2011) further identifies a variety of events confined to a small volume lying about 1 km below the crater, which they associated with explosive activity. Decompression experiments performed on Colima ballistic bombs ejected during recent vulcanian eruptions indicate decompression as great as 20 MPa (Lavallee et al2012), which is equivalent to the lithostatic pressure 1.2 km below the summit.…”

Section: Link Between the Melt Inclusion And Surface Volcano Monitorimentioning

confidence: 99%

Volatiles contents, degassing and crystallisation of intermediate magmas at Volcan de Colima, Mexico, inferred from melt inclusions

Reubi

Blundy

Varley

2013

Contrib Mineral Petrol

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In volatile-saturated magmas, degassing and crystallisation are interrelated processes which influence the eruption style. Melt inclusions provide critical information on volatile and melt evolution, but this information can be compromised significantly by post-entrapment modification of the inclusions. We assess the reliability and significance of pyroxene-hosted melt inclusion analyses to document the volatile contents (particularly H 2 O) and evolution of intermediate arc magmas at Volcán de Colima, Mexico. The melt inclusions have maximal H 2 O contents (B4 wt%) consistent with petrological estimates and the constraint that the magmas crystallised outside the amphibole stability field, demonstrating that pyroxenehosted melt inclusions can preserve H 2 O contents close to their entrapment values even in effusive eruptions with low effusion rates (0.6 m 3 s -1 ). The absence of noticeable H 2 O loss in some of the inclusions requires post-entrapment diffusion coefficients (B1 9 10 -13 m 2 s -1 ) at least several order of magnitude smaller than experimentally determined H ? diffusion coefficient in pyroxenes. The H 2 O content distribution is, however, not uniform, and several peaks in the data, interpreted to result from diffusive H 2 O reequilibration, are observed around 1 and 0.2 wt%. H 2 O diffusive loss is also consistent with the manifest lack of correlations between H 2 O and CO 2 or S contents. The absence of textural evidence supporting post-entrapment H 2 O loss suggests that diffusion most likely occurred via melt channels prior to sealing of the inclusions, rather than through the host crystals. Good correlation between the melt inclusion sealing and volcano-tectonic seismic swarm depths further indicate that, taken as a whole, the melt inclusion population accurately records the pre-eruptive conditions of the magmatic system. Our data demonstrate that H 2 O diffusive loss is a second-order process and that pyroxene-hosted melt inclusions can effectively record the volatile contents and decompression-induced crystallisation paths of vapoursaturated magmas.

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Section: Link Between the Melt Inclusion And Surface Volcano Monitorimentioning

confidence: 99%

Volatiles contents, degassing and crystallisation of intermediate magmas at Volcan de Colima, Mexico, inferred from melt inclusions

Reubi

Blundy

Varley

2013

Contrib Mineral Petrol

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“…For each station, the panel on the left contains the distribution of RL fraction; the central panel displays the azimuth distribution; the right graphic shows the dip distribution. near field as well (Petrosino et al, 2011;De Lauro et al, 2012a). In addition, volcanic tremor with frequency content matching that of FB2 has been already observed in other areas (De Lauro et al, 2005;Haney, 2010) and a competition between volcanic and non-volcanic sources has been already detected at Stromboli, with the evidence of volcanic tremor during a phase of low-energy microseismic noise (De Lauro et al, 2005.…”

Section: Palo and P Cusano: Analysis Of The Seismic Noise At Volcmentioning

confidence: 79%

“…It shows a wide range of eruption styles, like dome growth, lava flow accompanied by frequent small block avalanches, phreatic explosions, explosive events and pyroclastic flows (Luhr, 2002;Petrosino et al, 2011).…”

Section: Published By Copernicus Publications On Behalf Of the Europementioning

confidence: 99%

“…Most vulcanian-style explosions are preceded by a high-energy transient seismic event with principal frequency peak at about 0.4 Hz and over-modes. This transient event is generated in the crater area and is induced by strong and rapid degassing flux interacting with the volcanic conduit and leading to the eruption (Zobin et al, 2006(Zobin et al, , 2010Petrosino et al, 2011;De Lauro et al, 2012a). Such pressurization (or long-period) events dominate the seismicity of active volcanic areas and share with the volcanic tremor very similar spectral content and wavefield properties, as the effect of a common source mechanism (e.g., Chouet, 1996;De Lauro et al, 2008).…”

Section: Published By Copernicus Publications On Behalf Of the Europementioning

confidence: 99%

“…Specifically, degassing permanently can put in vibration the main conduit of the plumbing system, exciting its fundamental vibration mode. During vulcanian-style explosions, the degassing flux is strongly enhanced due to the coherent rapid movement of aggregated magma-gas mixtures nucleated at a depth of 1-3 km, producing very energetic conduit oscillations with the appearance of higher vibration modes along the entire event and a broad spectrum just during the nucleation Petrosino et al, 2011;De Lauro et al, 2012a). Our scheme follows the behaviour of many volcanoes worldwide for which explosion-related seismic events and background signals are both manifestations of a common source, i.e.…”

Section: Palo and P Cusano: Analysis Of The Seismic Noise At Volcmentioning

confidence: 99%

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Wavefield decomposition and phase space dynamics of the seismic noise at Volcàn de Colima, Mexico: evidence of a two-state source process

Palo

Cusano

2013

Nonlin. Processes Geophys.

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Abstract. We analyse the seismic noise recorded at the Colima Volcano (Mexico) in the period December 2005-May 2006 by four broadband three-component seismic stations. Specifically, we characterize the spectral content of the signal and follow its time evolution along all the data set. Moreover, we infer the properties of the attractor in the phase space by false nearest neighbours analysis and GrassbergerProcaccia algorithm, and adopt a time-domain decomposition method (independent component analysis) to find the basic constituents (independent components) of the system. Constraints on the seismic wavefield are inferred by the polarization analysis. We find two states of the background seismicity visible in different time-intervals that are Phase A and Phase B. Phase A has a spectrum with two peaks at 0.15 Hz and 0.3 Hz, with the latter dominating, an attractor of correlation dimension close to 3, three quasi-monochromatic independent components, and a relevant fraction of craterpointing polarization solutions in the near-field. In Phase B, the spectrum is preserved but with the highest peak at 0.15 Hz, the attractor has a correlation dimension close to 2, two independent components are extracted, and the polarization solutions are dominated by Rayleigh waves incoming from the southwest direction. We depict two sources acting on the background seismicity that are the microseismic noise loading on the Pacific coastline and a low-energy volcanic tremor. A change in the amplitude of the microseismic noise can induce the switching from a state of the system to the other.

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Strain‐induced permeability increase in volcanic rock

Farquharson

Heap

Baud

2016

Geophysical Research Letters

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The extrusion of dense, viscous magma typically occurs along pronounced conduit‐parallel faults. To better understand the evolution of fault permeability with increasing strain, we measured the permeability of low‐porosity volcanic rock samples (basalt and andesite) that were deformed in the brittle regime to various levels of inelastic strain. We observed a progressive increase in sample permeability with increasing inelastic strain (i.e., with continued sliding on the fault plane). At the maximum imposed inelastic strain (0.11), sample permeability had increased by 3 orders of magnitude or more for all sample sets. Microstructural observations show that narrow shear fractures evolve into more complex fracture systems characterized by thick zones of friction‐induced cataclasis (gouge) with increasing inelastic strain. These data suggest that the permeability of conduit‐parallel faults hosted in the rock at the conduit‐wall rock interface will increase during lava extrusion, thus facilitating outgassing and hindering the transition to explosive behavior.

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Source location of long period seismicity at Volcàn de Colima, México

Abstract: This paper presents an analysis of seismicity associated with the volcanic activity of Volcàn de Colima (México) and recorded in the period

Cited by 22 publications

References 27 publications

Volatiles contents, degassing and crystallisation of intermediate magmas at Volcan de Colima, Mexico, inferred from melt inclusions

Volatiles contents, degassing and crystallisation of intermediate magmas at Volcan de Colima, Mexico, inferred from melt inclusions

Wavefield decomposition and phase space dynamics of the seismic noise at Volcàn de Colima, Mexico: evidence of a two-state source process

Strain‐induced permeability increase in volcanic rock

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