Evolution of the Magma Conduit Beneath the Galeras Volcano Inferred From Repeated Seismic Tomography

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Evolution of the Magma Conduit Beneath the Galeras Volcano Inferred From Repeated Seismic Tomography. / Koulakov, Ivan; Vargas, Carlos A.

In: Geophysical Research Letters, Vol. 45, No. 15, 16.08.2018, p. 7514-7522.

Research output: Contribution to journal › Article › peer-review

BibTeX

@article{33f0a61315434e4c8d877c70f8c3ee4a,

title = "Evolution of the Magma Conduit Beneath the Galeras Volcano Inferred From Repeated Seismic Tomography",

abstract = "The Colombian volcano Galeras is one of the most active volcanoes in the world, and it has an andesitic composition and high explosive potential. We consider the period of 1989–2015, in which the volcano manifested frequent eruptions and high seismic activity. To study the temporal variations in the seismic structure beneath Galeras, we implemented an algorithm of repeated tomography using selected data sets with similar geometries. We obtained the variations in the seismic velocity structures beneath Galeras during the three time episodes of 1989–2000, 2001–2007, and 2008–2015. In the second episode, we observe a columnar anomaly with a high V p/V s ratio that possibly represents a conduit transporting a new portion of magma material from below. This result may indicate that in this period, which culminated with dome emplacement and collapse, the volcano was directly fed from deeper magma sources. In other episodes, the conduit is less visible in the tomography models, and we propose that the volcanic activity was merely controlled by shallow magma reservoirs at 2–4 km below the surface.",

keywords = "Galeras volcano, magma conduit, repeated seismic tomography, shallow magma reservoir, COLOMBIA, LOCAL EARTHQUAKE TOMOGRAPHY",

author = "Ivan Koulakov and Vargas, {Carlos A.}",

year = "2018",

month = aug,

day = "16",

doi = "10.1029/2018GL078850",

language = "English",

volume = "45",

pages = "7514--7522",

journal = "Geophysical Research Letters",

issn = "0094-8276",

publisher = "Wiley-Blackwell",

number = "15",

}

RIS

TY - JOUR

T1 - Evolution of the Magma Conduit Beneath the Galeras Volcano Inferred From Repeated Seismic Tomography

AU - Koulakov, Ivan

AU - Vargas, Carlos A.

PY - 2018/8/16

Y1 - 2018/8/16

N2 - The Colombian volcano Galeras is one of the most active volcanoes in the world, and it has an andesitic composition and high explosive potential. We consider the period of 1989–2015, in which the volcano manifested frequent eruptions and high seismic activity. To study the temporal variations in the seismic structure beneath Galeras, we implemented an algorithm of repeated tomography using selected data sets with similar geometries. We obtained the variations in the seismic velocity structures beneath Galeras during the three time episodes of 1989–2000, 2001–2007, and 2008–2015. In the second episode, we observe a columnar anomaly with a high V p/V s ratio that possibly represents a conduit transporting a new portion of magma material from below. This result may indicate that in this period, which culminated with dome emplacement and collapse, the volcano was directly fed from deeper magma sources. In other episodes, the conduit is less visible in the tomography models, and we propose that the volcanic activity was merely controlled by shallow magma reservoirs at 2–4 km below the surface.

AB - The Colombian volcano Galeras is one of the most active volcanoes in the world, and it has an andesitic composition and high explosive potential. We consider the period of 1989–2015, in which the volcano manifested frequent eruptions and high seismic activity. To study the temporal variations in the seismic structure beneath Galeras, we implemented an algorithm of repeated tomography using selected data sets with similar geometries. We obtained the variations in the seismic velocity structures beneath Galeras during the three time episodes of 1989–2000, 2001–2007, and 2008–2015. In the second episode, we observe a columnar anomaly with a high V p/V s ratio that possibly represents a conduit transporting a new portion of magma material from below. This result may indicate that in this period, which culminated with dome emplacement and collapse, the volcano was directly fed from deeper magma sources. In other episodes, the conduit is less visible in the tomography models, and we propose that the volcanic activity was merely controlled by shallow magma reservoirs at 2–4 km below the surface.

KW - Galeras volcano

KW - magma conduit

KW - repeated seismic tomography

KW - shallow magma reservoir

KW - COLOMBIA

KW - LOCAL EARTHQUAKE TOMOGRAPHY

UR - http://www.scopus.com/inward/record.url?scp=85052564592&partnerID=8YFLogxK

U2 - 10.1029/2018GL078850

DO - 10.1029/2018GL078850

M3 - Article

AN - SCOPUS:85052564592

VL - 45

SP - 7514

EP - 7522

JO - Geophysical Research Letters

JF - Geophysical Research Letters

SN - 0094-8276

IS - 15

ER -

ID: 16330909