NEHRP Clearinghouse

Hokkaido Nansei-oki, Japan Earthquake of July 12, 1993.
Yanev, P. I.; Scawthorn, C. R.
National Center for Earthquake Engineering Research, Buffalo, NY.; National Science Foundation, Arlington, VA.; New York State Science and Technology Foundation, Albany., December 23, 1993, 142 p.
Identifying Number(s)
The report reviews damages caused by the magnitude 7.8 earthquake which occurred offshore, southwest of the Island of Hokkaido in Northern Japan on July 12, 1993. The earthquake caused moderately strong ground shaking over a wide area. A peak ground acceleration of 0.50g was recorded about 100 km from the edge of the offshore aftershock zone. The shock was followed by a large tsunami, which caused water run-ups of up to 30.5 m and extensive shoreline damage on the Island of Okushiri and along the southwest coast of Hokkaido. The tsunami devasted the town of Aonae, on the southern tip of Okushiri Island. The tsunami was followed by a fire, which destroyed much of the town Okushiri Island, light to moderate damage to infrastructure and industrial facilities, and extensive damage to roads and ports from ground failures up to about 100 km from the edge of the aftershock area.
Earthquake damage; Dynamic response; Ground motion; Damage assessment; Tsunamis; Buildings; Okushiri; Earthquakes; Aftershocks; Soil-structure interactions; Urban areas; Soil dynamics; Hokkaido; Seismic effects; Structural response; Japan; Fires; Ground subsidence; Hokkaido Japan Earthquake; Liquefaction