[H-DS10] Tsunami and tsunami forecast

[HDS10-08] Estimating sea surface changes from high sampling data of atmospheric and ocean bottom pressure perturbations induced by Hunga Tonga - Hunga Ha’apai volcano eruption

*Naotaka YAMAMOTO CHIKASADA¹ (1.National Research Institute for Earth Science and Disaster Resilience)

Keywords:Volcano eruption, Tsunami, V-net, DONET, S-net

Hunga Tonga - Hunga Ha’apai (HTHH) volcano explosively erupted on about 1PM Jan 15^th, 2022 (JST) and induced tsunami not only near field of volcano region but also far field. In Japan, we, National Research Institute for Earth Science and Disaster Resilience (NIED) are operating wide observation network for atmospheric pressure gauges in the infrastructure volcano observation network (V-net; https://doi.org/10.17598/NIED.0006) and ocean bottom pressure gauges in Dense Oceanfloor Network system for Earthquakes and Tsunamis (DONET; https://doi.org/10.17598/NIED.0008) and Seafloor observation network for earthquakes and tsunamis (S-net; https://doi.org/10.17598/NIED.0007). The pressure perturbations are recorded in both of atmospheric pressure gauges and ocean bottom pressure gauges simultaneously. This means ocean bottom pressure gauges records the atmospheric pressure perturbations with sea surface disturbance. In this presentation, we show data analysis results using both of atmospheric pressure gauges and ocean bottom pressure gauges.
Figure shows left-top) locations of pressure gauges of V-net, S-net and DONET, right-top) ocean bottom pressure changes recorded by S-net, left-bottom) same data recorded by DONET, right-bottom) atmospheric pressure changes recorded by V-net.
A part of this work was supported by JSPS KAKENHI Grant Numbers JP18K04674 and JP21K21353.