TY  - JOUR
PY  - 2013//
TI  - A large hydrothermal reservoir beneath Taal Volcano (Philippines) revealed by magnetotelluric observations and its implications to the volcanic activity
JO  - Proceedings of the Japan Academy, series B, physical and biological sciences
A1  - Alanis, Paul K. B.
A1  - Yamaya, Yusuke
A1  - Takeuchi, Akihiro
A1  - Sasai, Yoichi
A1  - Okada, Yoshihiro
A1  - Nagao, Toshiyasu
SP  - 383
EP  - 389
VL  - 89
IS  - 8
N2  - Taal Volcano is one of the most active volcanoes in the Philippines. The magnetotelluric 3D forward analyses indicate the existence of a large high resistivity anomaly (∼100 Ω·m) with a volume of at least 3 km × 3 km × 3 km, which is capped by a conductive layer (∼10 Ω·m), beneath the Main Crater. This high resistivity anomaly is hypothesized to be a large hydrothermal reservoir, consisting of the aggregate of interconnected cracks in rigid and dense host rocks, which are filled with hydrothermal fluids coming from a magma batch below the reservoir. The hydrothermal fluids are considered partly in gas phase and liquid phase. The presence of such a large hydrothermal reservoir and the stagnant magma below may have influences on the volcano's activity. Two possibilities are presented. First, the 30 January 1911 explosion event was a magmatic hydrothermal eruption rather than a base-surge associated with a phreato-magmatic eruption. Second, the earlier proposed four eruption series may be better interpreted by two cycles, each consisting of series of summit and flank eruptions.(Communicated by Seiya Uyeda, M.J.A.).<p />  <p>Language: en</p>
LA  - en
SN  - 0386-2208
UR  - http://dx.doi.org/
ID  - ref1
ER  -