[Faculty] Fwd: [CSRC.COLLOQUIUM] "Impulsive Tsunami and Large Runup Along the Sanriku Coast of Japan Produced by an Inelastic Wedge Deformation Model "

[Jose Castillo]

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*****   There Will Be An In Person Viewing Party In GMCS 314. *********


DATE:
*Friday, September 24, 2021*


TITLE:
*Impulsive Tsunami and Large Runup Along the Sanriku Coast of Japan
Produced by an Inelastic Wedge Deformation Model *

TIME:
*3:30-4:30PM*



LOCATION:
*Viewing Party - GMCS 314*
or
Join Zoom Meeting -   https://SDSU.zoom.us/j/86808277973
<https://sdsu.zoom.us/j/86808277973>


SPEAKER/BIO:
*Shuo Ma, Geological Sciences, San Diego State University *


ABSTRACT:

The Sanriku coast hosted several of the most devastating tsunami in
recorded history of Japan, including the 1896 Sanriku tsunami and 2011
Tohoku tsunami. The runup on the Sanriku coast in both tsunamis were up to
40 m. It is unclear why such large runup can occur. Large near-trench slip
north of 38.5°N in the Japan Trench were inferred to generate the
devastating 2011 tsunami on the Sanriku coast, which is, however,
inconsistent with the bathymetry observations. Here we show that the
inelastic failure of wedge sediments north of 38.5°N due to dynamic stress
can generate efficient short-wavelength seafloor uplift with diminishing
slip at the trench, consistent with the bathymetry observations, which
produces impulsive (short-period) tsunami that can be amplified by the
rugged Sanriku coast. An inelastic wedge deformation model of the 1896
Sanriku earthquake is shown to generate impulsive tsunami similar to what
was observed offshore the Sanriku coast in the 2011 Tohoku tsunami and
produce tsunami runup remarkably consistent with the observed runup of the
1896 Sanriku tsunami. Dynamic failure of thick wedge sediments north of
38.5°N in the Japan Trench likely plays an important role in the generation
of the devastating 2011 Tohoku tsunami.


Host:
*Jose Castillo*

Note: Videos of previous colloquium talks can be seen on the CSRC website
in the colloquium archive section or on the CSRC YouTube page here
<https://www.youtube.com/channel/UCN0ZEztlmyDqG2pm-Rle_Eg/feed>.




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