After landslides, damage to lifelines was the next most notable feature of the 23 October 2004 Niigata Ken Chuetsu, Japan, earthquake ( Mw=6.6). Roads and highways sustained damage at over 6,000 locations; rail lines, water systems, and wastewater systems sustained major damage; and over 300,000 customers lost electric power. Nagaoka's water supply was disrupted by the failure of electric power, which illustrates lifeline interaction, and Ojiya's water treatment plant almost lost its intake of raw water. Nagaoka's 1,079- km-long water system sustained damage at 287 locations, and Ojiya's 329- km-long water system sustained damage at 102 locations. In 2,672 km of wastewater piping, damage was sustained at over 9,000 locations, with manhole settlement or uplift at over 1,300 locations. The pattern of refugees was strongly influenced by the availability of lifeline services—primarily, electric power.
This is the damage investigation report on the 2000 Kohzushima Kinkai earthquake made by a JSCE reconnaissance team. Earthquake swarms continued near Kohzushima, Niijima, and Shikinejima islands for about three months. A JMA seismic intensity of lower 6 was recorded twice on Kohzushima during July, 2000. An outline of the earthquake and aftershocks and the damage done to civil structures is given. Slope failures, damage to retaining walls and disaster responses, in particular, are focused on.
Damage done to civil structures by the 2000 Tottori-ken Seibu Earthquake was investigated. Field surveys were made from October 8-10 by eight members dispatched by the JSCE in cooperation with other researchers. Descriptions are given of the earthquake, seismic ground motion; the damage done to such civil structures as roads, road bridges, lifelines, dams, port facilities; slope failures; and public risk management. Although peak ground accelerations were extremely intensive, structural damage was not as severe as compared with the average damage caused by past earthquakes in Japan. Such disaster responses as search and rescue activities, emergency responses, disaster information communication, and victim supports are discussed.
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