駿河湾沿岸の検潮井戸応答特性調査と2009年駿河湾地震津波波形の補正

概要

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In situ measurements of tide gauge response to tsunamis were conducted at five tide gauge stations on the coast of Suruga bay, where small tsunamis were recorded from the 2009 Suruga bay earthquake (M 6.5). At these stations, tide gauges are installed in wells connected to the outer sea by narrow intake pipes. To make the measurements, water was poured into the well to measure the outflow response through the intake pipe, and was then drained from the well to measure the inflow response. The estimated tide gauge response, expressed as recovery times for a 1m difference, was 5 to 7min at Tago and about 3min at Yaizu. At Uchiura and Shimizu-ko, the estimated recovery times are less than 1min, which is much shorter than the tsunami periods. At Omaezaki station, we could not measure the recovery because the tide gauge response was sufficient to record the short period component. The corrected tsunami waveforms from the 2009 Suruga bay earthquake are slightly different from those recorded at Tago and Yaizu, but they are almost identical at the other three stations.
2010-12-24