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Utilization of amplitude values from seismic waveforms recorded by DAS along a bullet train

Authors

Katakami,  Satoshi
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Noda,  Shunta
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Korenaga,  Masahiro
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Araki,  Eiichiro
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Takahashi,  Narumi
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Iwata,  Naoyasu
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Citation

Katakami, S., Noda, S., Korenaga, M., Araki, E., Takahashi, N., Iwata, N. (2023): Utilization of amplitude values from seismic waveforms recorded by DAS along a bullet train, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-4058


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5021498
Abstract
Distributed acoustic sensing (DAS) allows for the deployment of a few tens of meters of seismometers along the length of the optical fiber cable. However, the data obtained from DAS, particularly amplitude information, can vary based on the installation environment of the optical fiber cables. Our proposal is to conduct seismic observations using DAS with optical fiber cables. In this study, we applied DAS to the cable along the bullet train in Kumamoto prefecture, Japan, where aftershocks from the 2016 Mw7.3 Kumamoto earthquake are still highly active. We successfully observed strong motions of the Mj6.6 earthquake on January 22, 2022 in Hyuga-nada and several small local earthquakes for distances over 75 km. An accelerometer that simultaneously recorded the event observed a maximum acceleration of approximately 80 gal. The shaking map (maximum strain distribution) for Mj6.6 was estimated by correcting for cycle skipping caused by the dynamic range. The differential phase data indicated cycle skipping at various channels. We estimated the data from cycle-skipped channels using data from adjacent channels that were not cycle-skipped. The attenuation properties of local earthquakes were identified by correcting for site effects, coupling, and amplification of seismic waves by the railway structure. We observed that the peak strain values as well as PGV decreased with increasing hypocenter distance for each magnitude category. Our results indicate that accurately correcting DAS amplitude values can allow for empirical estimation of earthquake magnitude.