Time varying crustal anisotropy at Whakaari/White Island volcano
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Abstract
Whakaari/White Island has been the most active New Zealand volcano in the 21st century, producing small phreatic and phreatomagmatic eruptions, which are hard to predict. The most recent eruption occurred in 2019, tragically claiming the lives of 22 individuals and causing numerous injuries. We employed shear-wave splitting analyses to investigate variations in anisotropy during quiescence, unrest, and an eruption between 2018 and 2020. We examined spatial and temporal variations in 7972 shear-wave splitting measurements and derived 1402 Vp/IVs ratio measurements. Comparing shear-wave splitting parameters from similar earthquake paths across different times indicates that the observed temporal changes are unlikely to result from variations in earthquake paths through media with spatial variability. Instead, these changes may stem from variations in anisotropy over time, likely caused by changes in crack alignment due to stress or varying fluid content.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Time varying crustal anisotropy at Whakaari/White Island volcano |
| Series title | Geophysical Research Letters |
| DOI | 10.1029/2023GL106473 |
| Volume | 51 |
| Issue | 11 |
| Year Published | 2024 |
| Language | English |
| Publisher | Wiley |
| Contributing office(s) | Volcano Science Center |
| Description | e2023GL106473, 11 p. |
| Country | New Zealand |
| Other Geospatial | Whakaari/White Island volcano |
| Google Analytic Metrics | Metrics page |