Earthquake Rupture and Tsunami Generation of the 2015 M_w 5.9 Bonin Event Revealed by In Situ Pressure Gauge Array Observations and Integrated Seismic and Tsunami Wave Simulation

Abstract

Recent developments of offshore seismic and geodetic observations have advanced our understanding of the ocean (e.g., Bürgmann & Chadwell, 2014;Favali et al., 2015). The ocean-bottom absolute pressure gauge (APG) has also driven fundamental studies of tsunamis (e.g.,

Theoretical Solution and Applications of Ocean Bottom Pressure Induced by Seismic Waves at High Frequencies

“…Seismic waves recorded by pressure gauges may have other potential applications. For instance, pressure recording of tsunami buoys can provide seismic data coverage from the ocean side for earthquake source studies (e.g., Guo et al., 2020); future tsunami buoys to be installed close to trenches can be used for early earthquake warning purposes (An et al., 2017; Kubota et al., 2017, 2021); pressure data of OBSs along with vertical observations can be used to constrain Earth structure (Ruan et al., 2014, and this study). The development of such applications largely relies on theoretical relation between the ocean‐bottom pressure and seafloor motion.…”

Non-tidal oceanographic fluctuation characteristics recorded in DONET ocean-bottom pressure time series using principal component analysis

“…Seafloor geodetic observations are critical for accurately understanding crustal deformation associated with phenomena such as transient fault slips (e.g., Bürgmann & Chadwell, 2014). Among those seafloor geodetic instruments, the ocean bottom pressure-gauge (OBP) is a sensor that can continuously observe vertical crustal deformation of the seafloor and tsunamis over a broad range of time scales and has been the subject of many previous studies (Transient crustal deformation: e.g., Ito et al, 2013;Ohta et al, 2012;Wallace et al, 2016;Suzuki et al, 2016;Sato et al, 2017;Fukao et al, 2021;Woods et al, 2022; Tsunamis: e.g., Tsushima et al, 2012;Kubota et al, 2021). However, the water-pressure time series obtained by the OBP includes various components such as tidal impacts, instrumental drift, non-tidal oceanographic fluctuations, and crustal deformation, so addressing these influences is extremely important for extracting objective crustal deformation components.…”

Non-tidal oceanographic fluctuation characteristics recorded in DONET ocean-bottom pressure time series using principal component analysis

“…Seafloor geodetic observations are critical for accurately understanding crustal deformation associated with phenomena such as transient fault slips (e.g., Bürgmann & Chadwell, 2014). Among those seafloor geodetic instruments, the ocean bottom pressure-gauge (OBP) is a sensor that can continuously observe vertical crustal deformation of the seafloor and tsunamis over a broad range of time scales and has been the subject of many previous studies (Transient crustal deformation: e.g., Ito et al, 2013;Ohta et al, 2012;Wallace et al, 2016;Suzuki et al, 2016;Sato et al, 2017;Fukao et al, 2021;Woods et al, 2022; Tsunamis: e.g., Tsushima et al, 2012;Kubota et al, 2021). However, the water-pressure time series obtained by the OBP includes various components such as tidal impacts, instrumental drift, non-tidal oceanographic fluctuations, and crustal deformation, so addressing these influences is extremely important for extracting objective crustal deformation components.…”