Environmental Engineering Reference
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Fig. 12.8 Records of pressure gauges of DONET1 during the 2011 East Japan earthquake
DONET1 observatories recorded the seismic waves and tsunamis of the 2011
East Japan Earthquake. Figure 12.8 shows the DONET1 tsunami records at this
earthquake (Baba et al. 2013 ), and indicates the importance and signifi cance of off-
shore observation for the advanced earthquake and tsunami early warning. We could
estimate the ratio of tsunami amplifi cation from offshore site to onshore site. In this
case, the ratio was estimated to be about 6-10 times. By using ocean fl oor network
as DONET, we can detect earthquakes and tsunamis earlier than the land stations
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