1. Akagiri, T. (1988): Damage caused by earthquake of east coast of Chiba Prefecture and ground conditions of damaged district. Damage caused by liquefaction of ground especially (prompt report). Journal of the Geospatial Information Authority of Japan, 67, 39-46.
2. Aoyama, M. and Koyama, T. (2015): Correlation between liquefaction areas in Kamisu and Kashima Cities caused by the 2011 off the Pacific coast of Tohoku Earthquake and the time-series changes of distribution of gravel pits. Annual Meeting of the Association of Japanese Geographers, Spring 2015, 87, 138.
3. Aoyama, M. and Koyama, T. (2017): Relationship between liquefied areas caused by the 2011 off the Pacific coast of the Tohoku Earthquake and time-series changes in the distribution of sand-gravel pits in Kamisu and Kashima cities. Journal of Geography (Chigaku Zasshi), 126, 767-784.
4. Aoyama, M., Koyama, T. and Une, H. (2014): Geomorphological condition and land history of liquefaction damaged sites in the lower part of the Tone River lowland induced by the 2011 off the Pacific coast of Tohoku Earthquake. Geographical Review of Japan Series A, 87, 128-142.
5. Environmental Research Center, Chiba Prefecture (2012): Liquefaction-Fluidization Phenomena on Boso Peninsula at the 2011 Earthquake off the Pacific Coast of Tohoku, Central Japan. Part1-Part5. Research Report of Chiba Prefecture Environmental Research Center G-8.