National Tsunami Warning Center, NOAA/NWS
TSUNAMI of 25 September 2003
A great earthquake with a moment magnitude of 8.0 occurred at 1950 UTC 25 September 2003
and was located near Hokkaido, Japan Region (41.89N 143.77E, 10km depth - USGS location).
The earthquake produced a tsunami that was recorded at several tide gages
(operated by NOAA/National Ocean Survey, the Pacific Tsunami Warning Center, the
University of Hawaii, and the Japanese Meteorological Agency).
If available, click on the site name to see a graph of the tsunami. Wave heights are maximum peak-to-trough
height in cm. Arrival time is the actual tsunami arrival time in UTC on gages where it could be determined.
The ETA is the estimated time of arrival computed at the National Tsunami Warning Center (NTWC)
based on the origin time and location. The Sample Interval column shows the time between samples.
(NOTE: for the 0.25 minute sample, the interval may vary). Click on the Data File column to get the raw
data for NOAA/NOS Alaska tide gages which have a 0.25minute real-time output to the NTWC.
Data can be saved using text mode with your browser. Time in these data files is the modified Julian time
in seconds times 100. Water level values are given in cm. The first sample in the file is the
first sample of the day. For additional information about this tsunami see
PMEL's Tsunami Research Web Page
Harry Yeh translated the following damage report from a personal
communication from Dr. Koshimura in Japan:
1. Port of Tokachi: more than 10 motor vehicles parked at the port where washed away into the sea by the tsunami.
No human casualty was reported.
2. Kushiro: two fishing boats were capsized.
3. Erimo-cho: A small car was washed away into the sea. The car was driven by an individual
who came to the port to check his fishing boat. No casualty was reported.
The following information was received from the Japan Meteorological Agency:
|Tide gage site||Maximum Observed Wave Amplitude (cm 0-p)|
|Kushiro, Japan||98 at 2018 GMT|
|Nemurohanasaki, Japan||90 at 2040 GMT|
|Miyako, Japan||57 at 2044 GMT|
|Ofunato, Japan||22 at 2049 GMT|
|Hachinohe, Japan||63 at 2053 GMT|
|Oshikaayukawa, Japan||16 at 2104 GMT|
|Hakodate, Japan||30 at 2121 GMT|
|Urakawa, Japan||129 at 2124 GMT|
|Iwakionahama, Japan||12 at 2124 GMT|
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