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http://dx.doi.org/10.7582/GGE.2014.17.2.058

Source Mechanism of an Explosive Eruption at White Island Volcano, New Zealand, Determined from Waveform Inversions  

Han, Arim (Department of Geophysics, Kangwon National University)
Kim, Keehoon (Department of Geological Sciences, University of North Carolina)
Kim, Ki Young (Department of Geophysics, Kangwon National University)
Publication Information
Geophysics and Geophysical Exploration / v.17, no.2, 2014 , pp. 58-65 More about this Journal
Abstract
We studied the source mechanisms of very-long-period event recorded at seismic station WIZ near White Island Volcano, New Zealand on August 4, 2012. Since seismic data at only one station were available, we conducted moment tensor inversion using three simplified models (explosion, crack, and pipe models). To constrain the moment tensor solution of seismic event, we computed synthetic data for each model to compare with observed data. Type and orientation for the best model is a crack at a depth of 1600 m with a dip of $80^{\circ}NE$ and a strike of $N80^{\circ}W$. We interpret that a deep explosion may have opened a crack for gases to escape, and the upward gas flow triggered the surface explosions four hours later as confirmed by a webcam. The interpretation based on moment tensor inversion is consistent with previous studies of geochemical data of the volcanic island.
Keywords
White Island; very long period signal; source mechanism; moment tensor; crack model;
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