Department of Geography, Archaeology, and Cultural Heritage

E-mail: kojiok[at]hiroshima-u.ac.jp

Research Fields

Tephrochronology and Paleoseismology

Research Keywords

  • Tephrochronology
  • Active Fault
  • Radiocarbon Dating
  • Seismic Risk Assessment
  • Quaternary
  • Paleoseismology

Research Outline

The research covers a wide area of Quaternary geology and geomorphology related to earthquakes, volcanic eruption, regional tectonics and radiometric ages.  His expertise in paleoseismology and active tectonics has significant contribution on long-term earthquake hazard assessment and on nuclear safety in Japan and many other countries.  Transfer of research technology to Turkey, Russia, South American countries and India successfully established the foundation of geological studies of earthquake in each country and collaborative research brought important findings.

Research Achievements

  • Active Fault and Paleoseismic Studies in Kangra Valley: Evidence of Surface Rupture of a Great Himalayan 1905 Kangra Earthquake (M-w 7.8), Northwest Himalaya, India, Bull. Seismol. Soc. America, 105(5), pp.2325-2342, 2015.
  • Paleoseismology of the Itoigawa-Shizuoka Tectonic Line in Central Japan, Journal of Seismology, 3, pp.411-431, 2001.
  • Trench Investigation along the Merida Section of the Bocono Fault (Central Venezuelan Andes), Venezuela, Tectonophysics, 306(1-2), pp.1-21, 1999.
  • Recent Surface Faulting Events along the Northern Part of the Itoigawa-Shizuoka Tectonic Line, Zishin, 2nd Ser., 50, pp.35-51, 1998.
  • Recent Surface Faulting Events along the Middle Section of the Itoigawa-Shizuoka Tectonic Line -Trenching Survey of the Gofukuji Fault near Matsumoto, Central Japan, Zishin, 2nd Ser., 46, pp.425-438, 1994.
  • Quaternary Tephra Studies in the Hokkaido District, Northern Japan, The Quaternary Research, 30, pp.379-390, 1991.