Japan Geoscience Union Meeting 2023

Presentation information

[E] Online Poster

S (Solid Earth Sciences ) » S-SS Seismology

[S-SS04] Seismological advances in the ocean

Tue. May 23, 2023 10:45 AM - 12:15 PM Online Poster Zoom Room (11) (Online Poster)

convener:Tatsuya Kubota(National Research Institute for Earth Science and Disaster Resilience), Takashi Tonegawa(Research and Development center for Earthquake and Tsunami, Japan Agency for Marine-Earth Science and Technology), Yukihiro Nakatani(Nansei-Toko Observatory for Earthquakes and Volcanoes, Graduate School of Science and Engineering, Kagoshima University)

On-site poster schedule(2023/5/22 17:15-18:45)

10:45 AM - 12:15 PM

[SSS04-P07] Estimating Rayleigh wave speed from a theoretical relation of ocean bottom pressure and vertical acceleration

*Han Deng1, Chao An1, Chen Cai2, Hengxin Ren3 (1.Shanghai Jiao Tong University, 2.Sun Yat-sen University, 3.Southern University of Science and Technology)

Keywords:Rayleigh wave speed, ocean-bottom pressure

Traditional studies utilize ocean-bottom vertical accelerations recorded by a station array to estimate the velocity structure of the Earth. The recordings of seafloor pressure is largely ignored in ocean-bottom seismology. In this study, we use realistic seismic observations to demonstrate that the ocean-bottom pressure and vertical seafloor acceleration satisfy a theoretical relation. For frequencies below the resonance frequency, the relation is a function of seismic wave speed. Thus, a method is developed to derive the Rayleigh wave phase velocity using recordings of pressure and vertical seafloor acceleration. The method is applicable to data at a single station, and it is suitable to constrain shallow Earth properties. This study implies that it is worth exploring the usage of ocean-bottom pressure of high frequencies in seafloor seismology.