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Classification of long-term very long period (VLP) volcanic earthquakes at Whakaari/White Island volcano, New Zealand
Author(s)
Date Issued
2020-07-06
Date Available
2021-09-14T09:38:55Z
Abstract
We have observed very long period earthquakes (VLPs) over the period 2007 to the end of 2019 at Whakaari/White Island volcano, New Zealand. The earthquakes exhibit similitude between waveforms which suggests repeating source locations and processes. VLPs recorded at two permanent stations were detected using waveform semblance and were then classified into two main families (F1 and F2) using a clustering analysis. The two families are characterized by ‘mirror image’ reverse waveform polarity suggesting that they are genetically related, but occur during different evolutionary phases of volcanic activity. F1 events occurred throughout the observation period, while F2 events mainly occurred as swarms that mark the onset of volcanic unrest. A detailed cluster analysis reveals possible sub-families implying slight temporal evolutions within a family. Our results add to our understanding of the volcanic magma–hydrothermal system at Whakaari/White Island indicating that relatively stable VLP sources may be exploited to improve monitoring for future unrest.[Figure not available: see fulltext.]
Other Sponsorship
New Zealand Natural Hazards Research Platform
Ministry of Business, Innovation and Employment
Resilience to Nature’s Challenges
Type of Material
Journal Article
Publisher
Springer
Journal
Earth, Planets and Space
Volume
72
Issue
1
Copyright (Published Version)
2020 the Authors
Language
English
Status of Item
Peer reviewed
ISSN
1343-8832
This item is made available under a Creative Commons License
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