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SUMMARY:Unusual volcanic tsunamis caused by trapdoor faulting at submarine
  calderas - Osamu Sandambata\, National Research Institute for Earth Scien
 ce and Disaster Resilience
DTSTART:20220302T160000Z
DTEND:20220302T170000Z
UID:TALK168050@talks.cam.ac.uk
CONTACT:Florian Millet
DESCRIPTION:At some submarine calderas in Japan and New Zealand\, moderate
 -sized earthquakes with seismic magnitudes of M5–6 repeated every decade
 . They unusually caused large tsunamis with a maximum wave height of about
  a meter at coastal tide gauges. For exploration of the unknown mechanism 
 of the peculiar volcanic tsunamis\, we utilized tsunami and seismic data o
 f the earthquakes to find a source model that explains both datasets. The 
 model indicates that the trapdoor faulting\, containing a large intra-cald
 era fault slip of 5 m and deformation of its sill-like magma chamber\, too
 k place in the submarine calderas and generated large tsunamis. Similariti
 es of the repeating earthquakes reflect the decadal recurrence of trapdoor
  faulting due to continuous magma supply beneath the calderas\, implying i
 ts potential of submarine eruptions. In conclusion\, our discovery of recu
 rrent volcanic tsunamigenesis by moderate-sized trapdoor faulting undersco
 res our need to monitor such submarine calderas for assessing tsunami haza
 rds.\n\nRecent preprint can be found at:\nhttps://www.essoar.org/doi/abs/1
 0.1002/essoar.10510526.1
LOCATION:ONLINE - Details to be sent by email
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