JpGU-AGU Joint Meeting 2020

Presentation information

[E] Oral

H (Human Geosciences ) » H-DS Disaster geosciences

[H-DS11] Subaqueous Landslides and Their Anthropogenic Impact for Coastal Regions

convener:Yujin Kitamura(Department of Earth and Environmental Sciences, Graduate School of Science and Engineering, Kagoshima University), Kiichiro Kawamura(Yamaguchi University)

[HDS11-04] What "tsunami earthquake" is?

★Invited Papers

*Toshikazu Ebisuzaki1 (1.RIKEN)

Keywords:tsunami earthquake, submarine landslide, liquefaction

Kanamori (1972) defined “tsunami earthquakes” as earthquakes that excite much stronger tsunami waves than that expected from the amplitude of the earthquake waves. He pointed that tsunami earthquakes always associated with slow crustal deformations with the time scale of several hundred seconds, but did not specify what is the cause of it. In the present presentation, I will look for the possibility that a tsunami earthquake is amplified by large-scale submarine landslides with the area of ~10000 km^2, caused by liquification of the sediments in the slope, induced by vibration of the earthquake.

[1] Kanamori, H.: Mechanism of tsunami earthquakes. Physics of the Earth and Planetary Interiors, 6, 346-359, 1972.