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JDR Vol.10 No.1 pp. 99-105
(2015)
doi: 10.20965/jdr.2015.p0099

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Electromagnetic Observations at Taal Volcano

Paul Karson Alanis*, Yoichi Sasai**, and Toshiyasu Nagao**,†

*Philippine Institute of Volcanology and Seismology (PHIVOLCS), C.P. Garcia Ave., UP Diliman, Quezon City 1100, Philippines

**Earthquake Prediction Research Center (EPRC), Tokai University, Orido 3-20-1, Shimizu, Shizuoka 424-0902, Japan

†corresponding author

Received:
August 19, 2014
Accepted:
November 26, 2014
Published:
February 1, 2015
Creative Commons License
Keywords:
magnetotellurics, resistivity structure, Taal Volcano, magmatic-hydrothermal eruption, hydrothermal reservoir
Abstract
The electromagnetic (EM) method first applied to monitor the activity of the Taal Volcano from 2005 consists of repeatedly surveying total magnetic intensity (TMF) and continuously measuring EM fields. The EM observation system was greatly improved through the SATREPS project summarized in this paper. The resistivity structure is investigated in the project using the magnetotelluric (MT) method. The MT method revealed a large hydrothermal reservoir just beneath the center of Volcano Island. The existence of this reservoir explains several things – the special features of the devastating 1911 eruption, i.e., that it was magmatic-hydrothermal, together with the geochemical characteristics of Main Crater Lake, especially the absence of SO2 gas. The reservoir’s formation process provides useful suggestions for understanding the volcano’s past eruption cycle.
Cite this article as:
P. Alanis, Y. Sasai, and T. Nagao, “Electromagnetic Observations at Taal Volcano,” J. Disaster Res., Vol.10 No.1, pp. 99-105, 2015.
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