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Bulletin of Volcanology

, 75:729 | Cite as

A large hydrothermal reservoir beneath Taal Volcano (Philippines) revealed by magnetotelluric resistivity survey: 2D resistivity modeling

  • Y. YamayaEmail author
  • P. K. B. Alanis
  • A. Takeuchi
  • J. M. CordonJr.
  • T. Mogi
  • T. Hashimoto
  • Y. Sasai
  • T. Nagao
Research Article

Abstract

Taal Volcano, located in the southwestern part of Luzon Island, Philippines, has frequently experienced catastrophic eruptions from both the Main Crater on Volcano Island and flank eruptions. These eruptions have been magmatic, phreatomagmatic, and hydrothermal, with the latter implying the existence of a large-scale hydrothermal system beneath the volcano. We conducted an electrical resistivity survey using the magnetotelluric method in order to identify the location and geometry of the hydrothermal reservoir and sealing cap rock. Two-dimensional inversion using the observed data indicates four similar resistivity sections. The structure at shallow depths corresponds to volcanic deposits and an aquifer. Below 1 km, the structure features a relatively resistive zone beneath the main crater surrounded by a conductive shell. We interpreted these to be a large hydrothermal reservoir with an impermeable cap rock sealing it. Recent ground deformation detected by GPS measurements suggests that the hydrothermal reservoir is active. The interpreted cap rock thins just beneath the main crater and could easily be destroyed by an imbalance in the hydrothermal system. We conclude that this hydrothermal reservoir plays a significant role in driving catastrophic eruptions that begin with a hydrothermal explosion at the main crater.

Keywords

Magnetotellurics Resistivity structure Hydrothermal reservoir Taal Volcano 

Notes

Acknowledgments

We would like to thank the Philippine Institute of Volcanology and Seismology (PHIVOLCS) for their considerable support in the fieldwork. This study was performed as a part of PHIVOLCS-SATREPS project (2010–2014) supported by JICA (Japan International Cooperation Agency) and JST (Japan Science and Technology Agency). Ms. Ma. Antonia V. Bornas at VMEPD (PHIVOLCS) provided us with invaluable information on volcano-geological aspects of Taal. The discussion with Prof. M. Uyeshima at Earthquake Research Institute, University of Tokyo, Dr. H. Hase at Volcanic Fluid Research Center, Tokyo Institute of Technology, and Prof. K. Aizawa at Institute of Seismology and Volcanology, Kyushu University, was greatly valuable for proceeding with our study. Dr. Y. Maeda at Graduate School of Environmental Studies, Nagoya University, gave us helpful comments regarding LP events beneath Taal Volcano. We thank the editors G. Giordano and J. DL White and two anonymous reviewers for their constructive comments, which helped us improve the manuscript. Most figures were created using the Generic Mapping Tools (GMT) software (Wessel and Smith 1998).

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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Y. Yamaya
    • 1
    • 2
    Email author
  • P. K. B. Alanis
    • 3
    • 5
  • A. Takeuchi
    • 3
  • J. M. CordonJr.
    • 5
  • T. Mogi
    • 4
  • T. Hashimoto
    • 4
  • Y. Sasai
    • 3
  • T. Nagao
    • 3
  1. 1.Geological Survey of JapanNational Institute of Advanced Industrial Science and Technology (AIST)TsukubaJapan
  2. 2.Earthquake Research InstituteThe University of TokyoBunkyo-kuJapan
  3. 3.Earthquake Prediction Research CenterTokai UniversityShimizu-kuJapan
  4. 4.Institute of Seismology and Volcanology, Faculty of ScienceHokkaido UniversitySapporoJapan
  5. 5.Philippine Institute of Volcanology and SeismologyQuezon CityPhilippines

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