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Slope failure at Myoken, Photo by K. Konagai at 37.337638, 138.82792, Oct. 25th 2004

Surfacial landslide mass have carried some houses down. Photo by K. Konagai at 37.365531, 138.87782, Oct. 25th 2004

South mouth of JR Enoki Tunnel was clooged up. Photo by K. Konagai at 37.333813, 138.827931, Oct. 25th 2004

Damage to the linnng of JR Wanazu Tunnel, Photo by K. Konagai at 37.262287, 138.882422, Nov. 14th 2004

Dainichi-yama landslide mass before snow time, Photo by K. Konagai at 37.308383, 138.887722, Dec. 17th 2004

Prefectural route 71 leading to Shiotani Tunnel, Photo by M. Numada at 37.314143, 138.870277, Nov. 13th 2004

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October 23 2004 Mid-Niigata Prefecture Earthquake, Japan
Time and date: 17:56JST, October 23, 2004, Mw=6.8, Epicenter: 37.3N 138.8E, Depth=15.8km

Reports/ papers

Konagai, K. Earthquake-induced soil displacements and their impact on rehabilitations, Proc., Japan Academy, 69(5) (Ser.B), 433-449, 2011.
Konagai, K, Takatsu, S. Kanai, T., Fujita, T., Ikeda, T. and Johansson, J.: Kizawa tunnel cracked on 23 October 2004 Mid-Niigata earthquake: An example of earthquake-induced damage to tunnels in active-folding zones, Soil Dynamics and Earthquake Engineering, 29(2), 394-403, 2009. Landslides J. 8:171-182, 2010.
Konagai, K, Fujita, T., Ikeda, T. andTakatsu, S.: Tectonic deformation buildup in folded mountain terrains in the October 23, 2004, Mid-Niigata earthquake, Soil Dynamics and Earthquake Engineering, 29(2), 261-267, 2009.