Classification of long-term very long period (VLP) volcanic earthquakes at Whakaari/White Island volcano, New Zealand

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Title: Classification of long-term very long period (VLP) volcanic earthquakes at Whakaari/White Island volcano, New Zealand
Authors: Park, IseulJolly, ArthurLokmer, IvanKennedy, Ben
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Date: 6-Jul-2020
Online since: 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.]
Funding Details: 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
Keywords: VLPEarthquake familySwarmVolcanic unrestClustering analysis
DOI: 10.1186/s40623-020-01224-z
Language: en
Status of Item: Peer reviewed
ISSN: 1343-8832
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Appears in Collections:Earth Sciences Research Collection

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