Japan Geoscience Union Meeting 2016

Presentation information


Symbol S (Solid Earth Sciences) » S-CG Complex & General

[S-CG62] Activation of long-term volcanic activity by mega-earthquake

Mon. May 23, 2016 5:15 PM - 6:30 PM Poster Hall (International Exhibition Hall HALL6)

Convener:*Eiichi Takahashi(Earth and Planetary Sciences, Graduate School of Science and Technology, Tokyo Institute of Technology), Mitsuhiro Nakagawa(Department of Natural History of Science, Faculty of Science, Hokkaido University), Kenji Satake(Earthquake Research Institute, University of Tokyo), Mie Ichihara(Earthquake Research Institute, University of Tokyo), Nobuo Geshi(Geological Survey of Japan, The National Institute of Advanced Industrial Science and Technology)

5:15 PM - 6:30 PM

[SCG62-P02] Is there any causality between the 2002-2005 volcanic activity of Baitoushan volcano and the 2011 Tohoku M9 earthquake?

*Hiromitsu Taniguchi1 (1.Center for Northeast Asian Studies, Tohoku University)

Keywords:Baitoushan volcano, 2011 Tohoku earthquake, Time correlation

From 2002 to 2005, the Baitoushan volcano on the border between China and North Korea showed an abnormality on the seismicity, temperature of hot spring, and on the summit elevation. The analysis using the ENVISAT SAR interferometry indicated the accumulation of magmatic fluid at about 5km under the summit of Baitoushan volcano. After the activity of Baitoushan volcano, in 2011, megathrust earthquake of M9 occurred in Japan. Many peoples feared the eruption of Japanese volcanoes including Fuji volcano under the influence of the megaquake.
The same kind of questions was born even for Baitoushan volcano, which is away 1300km from the epicenter. Is there any causality between the 2002-2005 volcanic activity of Baitoushan volcano and the 2011 megaquake?
To answer this problem, we need the knowledge of historical relationship between the Baitoushan eruption and the megaquake in Japan. For this we are required the knowledge of correct eruption age based on the ancient documents, and the analysis of relationship between the ages of eruption and megaquake in the past. After the analysis of old documents, we got four data sets of age differences; the average age difference is 1.3 year with a standard deviation of 7.2 year. Using these, we are able to estimate the corresponding age of eruption from the megaquake age. If we assume the eruption in relation to 2011 megaquake, the corresponding age of eruption with 3σ accuracy will be from 1991 to 2034. This time interval covers the present activity interval of 2002 to 2005. Thus the Baitoushan activity from 2002 must be related to 2011 megaquake in Japan.