@article{ref1,
title="Mechanism of the 2015 volcanic tsunami earthquake near Torishima, Japan",
journal="Science advances",
year="2018",
author="Fukao, Yoshio and Sandanbata, Osamu and Sugioka, Hiroko and Ito, Aki and Shiobara, Hajime and Watada, Shingo and Satake, Kenji",
volume="4",
number="4",
pages="eaao0219-eaao0219",
abstract="Tsunami earthquakes are a group of enigmatic earthquakes generating disproportionally large tsunamis relative to seismic magnitude. These events occur most typically near deep-sea trenches. Tsunami earthquakes occurring approximately every 10 years near Torishima on the Izu-Bonin arc are another example. Seismic and tsunami waves from the 2015 event [<i>M</i><sub>w</sub> (moment magnitude) = 5.7] were recorded by an offshore seafloor array of 10 pressure gauges, ~100 km away from the epicenter. We made an array analysis of dispersive tsunamis to locate the tsunami source within the submarine Smith Caldera. The tsunami simulation from a large caldera-floor uplift of ~1.5 m with a small peripheral depression yielded waveforms remarkably similar to the observations. The estimated central uplift, 1.5 m, is ~20 times larger than that inferred from the seismologically determined non-double-couple source. Thus, the tsunami observation is not compatible with the published seismic source model taken at face value. However, given the indeterminacy of <i>M</i><sub>zx</sub>, <i>M</i><sub>zy</sub>, and <i>M</i><sub>{tensile}</sub> of a shallow moment tensor source, it may be possible to find a source mechanism with efficient tsunami but inefficient seismic radiation that can satisfactorily explain both the tsunami and seismic observations, but this question remains unresolved.<p /> <p>Language: en</p>",
language="en",
issn="2375-2548",
doi="10.1126/sciadv.aao0219",
url="http://dx.doi.org/10.1126/sciadv.aao0219"
}