Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)
Online ISSN : 1883-8944
Print ISSN : 1884-2399
ISSN-L : 1883-8944
Characteristics of bottom pressure sensors of the dense ocean-floor network system for earthquakes and tsunamis
Hiroyuki MATSUMOTOEiichiro ARAKIKatsuyoshi KAWAGUCHIYoshiyuki KANEDA
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2011 Volume 67 Issue 2 Pages I_286-I_290

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Abstract

DONET, i.e., the dense ocean-floor network system for earthquakes and tsunamis has started in operation in the Nankai Trough in the early of 2010. DONET consists of various sensors such as broadband seismometer, seismic accelerometer, tsunami meter, etc. This paper focuses on bottom pressure sensors being used as tsunami meters. Long-term sensors' stabilities have been evaluated before/after the deployment into the deep-sea, and tide assimilation has been carried out in order for detection of crustal deformation with high accuracy. As a result, sensor drift of ~20 hPa per month could be measured in the laboratory experiment, and it may continue after the deployment. This paper also reports that the tsunami from the Tohoku-oki earthquake on 11 March 2011 could be detected by DONET with those peak-to-peak amplitudes of 20~40 cm.

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© 2011 by Japan Society of Civil Engineers
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