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Table 1. Tsunami waveform data recorded during the tsunami of the 2011 off the Pacific coast of Tohoku Earthquake.

From: Tsunami source area of the 2011 off the Pacific coast of Tohoku Earthquake determined from tsunami arrival times at offshore observation stations

Instrument type, number, location and bathymetry (m) Initial wave arrival time1 Arrival time for each phase2 Trough Local crest Primary crest
Coastal wave gauges a       
WS613 Kushiro Port 50.0 15:27 (−2) U 15:42
WS602 Tomakomai Port 50.7 15:34 (−2.5) D 15:47 16:04
WS202 Mutsu-Ogawara Port 43.8 15:21 (−2.5) D 15:29 15:43
WS203 Hachinohe Port 27.7 15:17 (−2) D 15:38 15:43 x
WS219 Kuji Port 49.5 15:02 (−2) D 15:21 x
WS205 Sendai New Port 21.3 14:54 (−1) D 15:33 x
RTK-GPS buoys a        
GPS807 OffNorthern Iwate 125 14:56 (−2) D 15:11 15:15 15:19
GPS804 Off Central Iwate 200 14:47 D 14:59 15:07 15:12
GPS802 Off Southern Iwate 204 14:48 D 14:57 15:12
GPS803 Off Northern Miyagi 160 14:47 D 14:56 15:14
GPS801 Off Central Miyagi 144 14:47 D x 15:17
GPS806 Off Fukushima 137 14:51 (−1) U 15:04 15:16
Cabled OBPGs        
KPG1 Off Tokachi 1 b 2218 15:02 (−2) U 15:05 15:12
KPG2 Off Tokachi 2 b 2210 15:08 (−2) U 15:11 15:24
TM1 Off Kamaishi 1 c 1618 14:47 U 14:58 15:01
TM2 Off Kamaishi 2 c 1013 14:47 D 14:52 15:05
BOS02 Off Boso 2 d 2090 15:05 (−2) U 15:21
BOS03 Off Boso 3 d 1898 15:08 (−2) U 15:24
Tsunami buoy e        
DART21401 SE off Etorofu Island 5.3×l03 15:44 (−2) U 15:53
DART buoys f        
DART21418 NE off Tokyo 5685 15:13 (−0.5) U 15:19
DART21413 SE off Tokyo 5822 16:02 (−1.5) U 16:07
  1. af. Sources of waveform data were (a) Port and Harbour Bureau, Ministry of Land, Infrastructure, Transport and Tourism (MLIT), (b) Japan Agency for Marine-Earth Science and Technology (JAMSTEC), (c) Earthquake Research Institute (ERI) at Tokyo University, (d) Japan Meteorological Agency (JMA), (e) Russian Far Eastern Regional Hydrometeorological Research Institute (RFERHRI), (f) National Oceanic and Atmospheric Administration (NOAA).
  2. 1. Bold numbers indicate almost identical arrival times for seismic and tsunami waves. Numbers in parentheses are corrections (minutes) to allow for rupture velocity. The direction of the initial deflection of the tsunami waveform is indicated by U (up) and D (down).
  3. 2. The cells containing “x” indicate no data and cells containing “-” indicate no corresponding phase in the tsunami waveform.