Infrasound Tornillos Produced by Volcán Cotopaxi's Deep Crater

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  • J. B. Johnson
    Department of Geosciences Boise State University Boise ID USA
  • M. C. Ruiz
    Instituto Geofisico Escuela Politecnica Nacional Quito Ecuador
  • H. D. Ortiz
    Escuela de Ciencias Físicas y Matemática Pontificia Universidad Católica del Ecuador Quito Ecuador
  • L. M. Watson
    Department of Geophysics Stanford University Stanford CA USA
  • G. Viracucha
    Instituto Geofisico Escuela Politecnica Nacional Quito Ecuador
  • P. Ramon
    Instituto Geofisico Escuela Politecnica Nacional Quito Ecuador
  • M. Almeida
    Instituto Geofisico Escuela Politecnica Nacional Quito Ecuador

書誌事項

公開日
2018-06-13
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#am
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1029/2018gl077766
公開者
American Geophysical Union (AGU)

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説明

<jats:title>Abstract</jats:title><jats:p>We characterize and interpret a new type of infrasound signal originating from the summit of Volcán Cotopaxi (Ecuador) that was primarily observed between September 2015 and March 2016, following the 2015 eruptive period. This infrasound waveform is a slowly decaying sinusoid with exceptional low‐frequency (<jats:italic>f</jats:italic><jats:sub>p</jats:sub> = 0.2 Hz) and high quality factor (<jats:italic>Q</jats:italic> = ~10) and resembles the shape of tornillo seismic waveforms. The repeating events, occurring about once per day in early 2016, are stable in frequency content, and we attribute them to excitation of a vertical‐walled crater, with radius of about 125 m and length of 300 m. Spectral properties of the tornillo permit constraints on crater sound speed (335 m/s ± 6%) and temperature (4–32°C). The initial polarity of the tornillos is predominantly a rarefaction and could reflect repeating crater bottom collapse events (implosions) or explosion sources whose infrasound is heavily modulated by the crater's pipe‐like geometry.</jats:p>

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