Copyright Information: All images are in the public domain and available for free. If you use this image, credit NOAA/NGDC, Commander Dennis J. Sigrist, International Tsunami Information Center. |
Numerous battery-operated clocks were found scattered in the debris. These provide a rough estimate of the arrival time of inundating, destructive waves. The salt water shorted the electrical mechanism in the clock, causing it to stop. This clock at Aonae, Okushiri Island, shows a travel time (not necessarily for the first wave, but the first inundating wave at this specific location in Aonae) of some fifteen minutes following the earthquake. Clocks on the west side of Okushiri Island showed travel times of as little as six to seven minutes. Image Credit: Commander Dennis J. Sigrist. International Tsunami Information Center July 12, 1993 Hokkaido Japan earthquake and tsunami On July 12, 1993, a magnitude 7.6 Ms (7.7 Mw) (HRV) earthquake at 13:17 UT in the Sea of Japan near Hokkaido caused a back-arc tsunami that caused damage in all of the countries bordering the Sea of Japan. The earthquake had a rupture length of 150 kilometers, a movement of 2.5 meters and a dip to the east of 24 degrees. The tsunami was 32 meters high on Okishuri, Island, where the most destruction occurred. The whole island subsided by 5-80 centimeters. Event Data:
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