Journal
JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH
Volume 314, Issue -, Pages 49-56Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jvolgeores.2015.07.024
Keywords
Geothermal; Seismicity; Earthquake location; Earthquake swarm; Taupo Volcanic Zone
Categories
Funding
- New Zealand Government
- EQC
- GNS Science
- LINZ
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The Waimangu-Rotomahana-Mt.Tarawera geothermal field (WRTGF) in the Taupo Volcanic Zone, New Zealand, experiences frequent but sporadic earthquake swarms with durations of less than 1 day. Here we examine detailed locations of the seismic activity using precise double-difference relative location techniques. We utilize a combination of cross-correlation-derived arrival times and catalogue-based arrival times from 582 earthquakes recorded in the area between 2004 and 2015 for the relocation analysis. The new earthquake locations highlight a similar to 6 km long NE-SW lineation, which we infer to represent a sub-surface fault that extends along the northern side of Waimangu geothermal system and the north-western end of Lake Rotomahana. We suggest that this structural feature acts as a permeable pathway for aqueous fluid and CO2 release up to the surface geothermal field and Lake Rotomahana, from a deeper magmatic source. (C) 2015 Elsevier B.V. All rights reserved.
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