Ambient noise tomography of Misti volcano, Peru

被引：4

作者：

Cabrera-Pérez I. ^{[1
]}

Centeno R. ^{[2
]}

Soubestre J. ^{[1
]}

D'Auria L. ^{[1
,3
]}

Rivera M. ^{[2
]}

Machacca R. ^{[2
]}

机构：

[1] Instituto Volcanológico de Canarias (INVOLCAN), Granadilla de Abona, Canary Islands, Tenerife

[2] Instituto Geofı́sico del Perú, Urbanización La Marina B19, Arequipa, Cayma

[3] Instituto Tecnológico y de Energías Renovables (ITER), Granadilla de Abona, Canary Islands, Tenerife

来源：

Journal of Volcanology and Geothermal Research | 2022年 / 426卷

关键词：

Ambient noise tomography; Misti volcano; Transdimensional inversion;

D O I：

10.1016/j.jvolgeores.2022.107538

中图分类号：

学科分类号：

摘要：

To better understand the recent internal structure of Misti volcano, we determined a 3D S-wave velocity model applying Ambient Noise Tomography (ANT). We used data from 23 broadband and short-period seismic stations temporarily installed at Misti volcano between March and December 2011. This dataset allowed us to obtain empirical Green's functions by cross-correlating seismic ambient noise signals. Then, we retrieved 104 dispersion curves using the frequency-time analysis (FTAN) and, through a non-linear multiscale inversion, we obtained nine 2-D Rayleigh waves group velocity maps for periods in the range 0.7 s - 2 s. Finally, we carried out the depth inversion through a Bayesian transdimensional inversion to obtain a 3-D S-wave velocity model down to 3 km depth. Our study highlights five relevant seismic velocity anomalies. We observed the presence of three high-velocity zones located in the west-northwest, southwest and southeast parts of the crater, that could be related to intrusive bodies possibly associated with the formation of Misti volcano. We also observed two low-velocity anomalies in the volcano's western and central parts, which coincide with previous studies' findings and are related to fractured and weakened materials associated with the external caldera collapse and recent eruption episodes. © 2022 Elsevier B.V.

引用

共 65 条

[41] Masterlark T., Haney M., Dickinson H., Fournier T., Searcy C., Rheologic and structural controls on the deformation of Okmok volcano, Alaska: FEMs, InSAR, and ambient noise tomography, J. Geophys. Res. Solid Earth, 115, B2, (2010)
[42] Mordret A., Rivet D., Landes M., Shapiro N.M., Three-dimensional shear velocity anisotropic model of Piton de la Fournaise Volcano (La Réunion Island) from ambient seismic noise, J. Geophys. Res. Solid Earth, 120, 1, pp. 406-427, (2015)
[43] Moussallam Y., Peters N., Masias P., Apaza F., Barnie T., Schipper C., Oppenheimer C., Magmatic gas percolation through the old lava dome of El Misti volcano, Bull. Volcanol., 79, 46, (2017)
[44] Nagaoka Y., Nishida K., Aoki Y., Takeo M., Ohminato T., Seismic imaging of magma chamber beneath an active volcano, Earth Planet. Sci. Lett., 333, pp. 1-8, (2012)
[45] Navarro P., Cartografía geológica, historia eruptiva y evaluación de las amenazas volcánicas del estrato-volcán Misti, (2000)
[46] Nouibat A., Stehly L., Paul A., Schwartz S., Bodin T., Dumont T., Brossier R., Lithospheric transdimensional ambient-noise tomography of W-Europe: implications for crustal-scale geometry of the W-Alps, Geophys. J. Int., 229, 2, pp. 862-879, (2022)
[47] Obermann A., Lupi M., Mordret A., Jakobsdottir S.S., Miller S.A., 3D-ambient noise Rayleigh wave tomography of Snæfellsjökull volcano, Iceland, J. Volcanol. Geotherm. Res., 317, pp. 42-52, (2016)
[48] Obermann A., Molinari I., Metaxian J.P., Grigoli F., Strauch W., Wiemer S., Structure of Masaya and Momotombo volcano, Nicaragua, investigated with a temporary seismic network, J. Volcanol. Geotherm. Res., 379, pp. 1-11, (2019)
[49] Ramos D., Aplicación del método geofísico del potencial espontáneo para el estudio estructural del volcán Misti, (2000)
[50] Rivera M., Martin H., Le Pennec J.L., Thouret J.C., Gourgaud A., Gerbe M.C., Petro-geochemical constraints on the source and evolution of magmas at El Misti volcano (Peru), Lithos, 268, pp. 240-259, (2017)

← 1 2 3 4 5 6 7 →