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Site effect determination using seismic noise from Tungurahua volcano (Ecuador): implications for seismo-acoustic analysis

Research output: Contribution to journalArticle

Original languageEnglish
Pages (from-to)1084-1100
Number of pages17
JournalGeophysical Journal International
Volume201
Issue number2
DOIs
DateAccepted/In press - 11 Feb 2015
DatePublished (current) - May 2015

Abstract

Scattering and refractions that occur in the heterogenous near-surface beneath seismic stations can strongly affect the relative amplitudes recorded by three-component seismometers. Using data from Tungurahua volcano we have developed a procedure to correct these ‘site effects’. We show that seismic noise signals store site information, and then use their normalized spectral amplitudes as site frequency response functions. The process does not require a reference station (as per the S-wave and coda methods) or assume that the vertical amplitude is constant (the H/V component ratio method). Correcting the site effects has three consequences on data analysis: (1) improvement of the seismic source location and its energy estimation; (2) identification of a strong influence on the volcanic acoustic seismic ratio (VASR) and (3) decoupling the air wave impact on the ground caused by explosions or eruption jets. We show how site effect corrections improve the analysis of an eruption jet on 2006 July 14–15, appearing two periods of strong acoustic energy release and a progressive increase of the seismic energy, reaching the maximum before finishing the eruption.

    Research areas

  • Site effects, Volcano seismology, Acoustic properties, Explosive volcanism

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  • Geophys. J. Int. 2015 Palacios 1084 100

    Rights statement: This is the final published version of the article (version of record). It first appeared online via Oxford University Press at http://gji.oxfordjournals.org/content/201/2/1084.full.

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