Shallow <i>S</i> wave attenuation and actively degassing magma beneath Taal Volcano, Philippines

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  • Hiroyuki Kumagai
    Graduate School of Environmental Studies Nagoya University Nagoya Japan
  • Rudy Lacson
    Philippine Institute of Volcanology and Seismology Quezon City Philippines
  • Yuta Maeda
    Graduate School of Environmental Studies Nagoya University Nagoya Japan
  • Melquiades S. Figueroa
    Philippine Institute of Volcanology and Seismology Quezon City Philippines
  • Tadashi Yamashina
    Kochi Earthquake Observatory, Faculty of Science Kochi University Kochi Japan

書誌事項

公開日
2014-10-03
権利情報
  • http://creativecommons.org/licenses/by-nc-nd/3.0/
DOI
  • 10.1002/2014gl061193
公開者
American Geophysical Union (AGU)

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説明

<jats:title>Abstract</jats:title><jats:p>Taal Volcano, Philippines, is one of the world's most dangerous volcanoes given its history of explosive eruptions and its close proximity to populated areas. A real‐time broadband seismic network was recently deployed and has detected volcano‐tectonic events beneath Taal. Our source location analysis of these volcano‐tectonic events, using onset arrival times and high‐frequency seismic amplitudes, points to the existence of a region of strong attenuation near the ground surface beneath the east flank of Volcano Island in Taal Lake. This region is beneath the active fumarolic area and above sources of pressure contributing inflation and deflation, and it coincides with a region of high electrical conductivity. The high‐attenuation region matches that inferred from an active‐seismic survey conducted at Taal in 1993. These features strongly suggest that the high‐attenuation region represents an actively degassing magma body near the surface that has existed for more than 20 years.</jats:p>

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