5:15 PM - 6:45 PM
[U15-P68] The 2024 Noto Peninsula Earthquake Tsunami Recorded by Strainmeters
Keywords:The 2024 Noto Peninsula earthquake, Tsunami, Strainmeter
The Noto Peninsula earthquake (M7.6) occurred on January 1 this year, and according to the Cabinet Office, 241 people were killed, 1,299 were injured, and 110,287 houses were damaged. The tsunami that accompanied the earthquake was also observed by a strainmeter installed by Tohoku University in Tobishima, Yamagata Prefecture. Compared with the data from the tide gauge installed at Tobishima by GSI, the phase correspondence is very good, while the amplitude of each phase does not show good agreement.
This may be due to the fact that the tide gauge records the tidal level change at a single point where the instrument is installed, whereas the tsunami strain records the loading deformation associated with the rise and fall of the sea level.
In order to obtain the strain/tidal level conversion coefficient based on the overall waveform characteristics, the tsunami envelopes (Hayashi+, 2009) were calculated and compared, and the results were about 10 mm/ppb when the two were matched at the maximum amplitude and about 7 mm/ppb when they were matched over the entire coda portion. The tide records up to just before the arrival of the tsunami on Tobishima Island may have been affected by waves, so the above conversion coefficients need to be further investigated.
In this presentation, we also report a tsunami observed at Fukaura, Aomori Prefecture, although the amplitude is smaller than that of Tobishima.
This may be due to the fact that the tide gauge records the tidal level change at a single point where the instrument is installed, whereas the tsunami strain records the loading deformation associated with the rise and fall of the sea level.
In order to obtain the strain/tidal level conversion coefficient based on the overall waveform characteristics, the tsunami envelopes (Hayashi+, 2009) were calculated and compared, and the results were about 10 mm/ppb when the two were matched at the maximum amplitude and about 7 mm/ppb when they were matched over the entire coda portion. The tide records up to just before the arrival of the tsunami on Tobishima Island may have been affected by waves, so the above conversion coefficients need to be further investigated.
In this presentation, we also report a tsunami observed at Fukaura, Aomori Prefecture, although the amplitude is smaller than that of Tobishima.