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Bulletin of Volcanology

, 78:80 | Cite as

Relationship between volcanic ash fallouts and seismic tremor: quantitative assessment of the 2015 eruptive period at Cotopaxi volcano, Ecuador

  • Benjamin Bernard
  • Jean Battaglia
  • Antonio Proaño
  • Silvana Hidalgo
  • Francisco Vásconez
  • Stephen Hernandez
  • Mario Ruiz
Research Article

Abstract

Understanding the relationships between geophysical signals and volcanic products is critical to improving real-time volcanic hazard assessment. Thanks to high-frequency sampling campaigns of ash fallouts (15 campaigns, 461 samples), the 2015 Cotopaxi eruption is an outstanding candidate for quantitatively comparing the amplitude of seismic tremor with the amount of ash emitted. This eruption emitted a total of ~1.2E + 9 kg of ash (~8.6E + 5 m3) during four distinct phases, with masses ranging from 3.5E + 7 to 7.7E + 8 kg of ash. We compare the ash fallout mass and the corresponding cumulative quadratic median amplitude of the seismic tremor and find excellent correlations when the dataset is divided by eruptive phase. We use scaling factors based on the individual correlations to reconstruct the eruptive process and to extract synthetic Eruption Source Parameters (daily mass of ash, mass eruption rate, and column height) from the seismic records. We hypothesize that the change in scaling factor through time, associated with a decrease in seismic amplitudes compared to ash emissions, is the result of a more efficient fragmentation and transport process. These results open the possibility of feeding numerical models with continuous geophysical data, after adequate calibration, in order to better characterize volcanic hazards during explosive eruptions.

Keywords

Cotopaxi Ash fallout Seismic tremor Correlation Ashgram 

Notes

Acknowledgments

Field campaigns for this study were funded by the project SENPLADES. Seismic data came from the JICA seismic network. This research has been conducted in the context of the Laboratoire Mixte International “Séismes et Volcans dans les Andes du Nord” of IRD. This work is the contribution n°2 of the project “Grupo de Investigación sobre la Ceniza Volcánica en Ecuador”. The authors thank the personnel of IGEPN, in particular those who participated to the field campaigns. Comments from D. Pyle, T. Nishimura, and an anonymous reviewer greatly improved a first version of this paper. We thank two anonymous reviewers and J. Taddeucci for their constructive comments which helped improving this paper.

Supplementary material

445_2016_1077_MOESM1_ESM.xls (96 kb)
Online Resources 1 (XLS 95 kb)
445_2016_1077_MOESM2_ESM.pdf (7.5 mb)
Online Resources 2 (PDF 7665 kb)
445_2016_1077_MOESM3_ESM.pdf (38 kb)
Online Resources 3 (PDF 38 kb)
445_2016_1077_MOESM4_ESM.pdf (46 kb)
Online Resources 4 (PDF 46 kb)
445_2016_1077_MOESM5_ESM.xls (3.3 mb)
Online Resources 5 (XLS 3382 kb)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  1. 1.Escuela Politécnica NacionalInstituto GeofísicoQuitoEcuador
  2. 2.Laboratoire Magmas et VolcansUniversité Blaise Pascal–CNRS–IRD, OPGCClermont-FerrandFrance

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