Skip to Main content Skip to Navigation
New interface
Theses

Understanding magmatic processes and seismo-volcano source localization with multicomponent seismic arrays

Abstract : In this thesis, we study the seismo-volcanic source localization using data recorded by new sensor arrays composed of three-component (3C) seismometers deployed on Ubinas stratovolcano (Peru). We develop a new framework (MUSIC-3C) of source localization method based on the well-known MUSIC algorithm. To investigate the performance of the MUSIC-3C method, we use synthetic datasets designed from eight broadband isotropic seismic sources located beneath the crater floor at different depths. The fundamental scheme of the MUSIC-3C method exploits the fact of the cross-spectral matrix of 3C array data, corresponding to the first seismic signal arrivals, provides of useful vector components (slowness, back-azimuth and incidence angle) from the seismic source. Application of the MUSIC-3C method on synthetic datasets shows the recovery of source positions. Real data used in this study was collected during seismic measurements with two seismic antennas deployed at Ubinas volcano in 2009, whose experiment conduced by volcanic teams of IRD-France (l'Institute de Recherche pour le Déveleppment), Geophysics group University College Dublin Ireland and Geophysical Institute of Peru (IGP). We apply the MUSIC-3C algorithm to investigate wave fields associated with the magmatic activity of Ubinas volcano. These analysis evidence a complex mechanism of vulcanian eruptions in which their seismic sources are found at two separated sources located at depths of 300 m and 1100 m beneath the crater floor. This implies the reproduction of similar mechanisms into the conduit. Based on the eruptive mechanisms proposed for other volcanoes of the same type, we interpret the position of this sources as the limits of the conduit portion that was involved in the fragmentation process.
Document type :
Theses
Complete list of metadata

Cited literature [133 references]  Display  Hide  Download

https://theses.hal.science/tel-00835676
Contributor : ABES STAR :  Contact
Submitted on : Wednesday, January 22, 2014 - 9:07:08 AM
Last modification on : Sunday, May 1, 2022 - 3:50:07 AM
Long-term archiving on: : Tuesday, April 22, 2014 - 10:15:49 PM

File

Inza.pdf
Version validated by the jury (STAR)

Identifiers

  • HAL Id : tel-00835676, version 2

Citation

Lamberto Adolfo Inza Callupe Inza Callupe. Understanding magmatic processes and seismo-volcano source localization with multicomponent seismic arrays. Earth Sciences. Université de Grenoble, 2013. English. ⟨NNT : 2013GRENU003⟩. ⟨tel-00835676v2⟩

Share

Metrics

Record views

657

Files downloads

1717