The Japan Agency for Marine-Earth Science and Technology has been conducting the 2016th research since March 3, 26 as part of the International Ocean Drilling Program (IODP) "Nankai Trough Earthquake Zone Drilling Program" by the deep-sea exploration vessel "CHIKYU". Announced that the voyage work has been completed.
Demian Saffer (Pennsylvania State University) and Achim Kopf (University of Bremen) are co-principal researchers on this research voyage, and researchers from the Ocean Research and Development Organization, Kyoto University, and Kagoshima University from Japan are participating.
In this research voyage, we collected the simple in-hole observation device "Genius Plug" installed in 85 at a point in the sea area about 2010 km southeast of Shingu City, Wakayama Prefecture, and collected data on the pressure and temperature in the hole for about 5 years. I was able to get it.In addition, we succeeded in installing the second long-term borehole observation system "LTBMS" in the Nankai Trough.Multiple sensors that measure temperature, inclination, etc. are installed and fixed to capture detailed crustal movements near the giant bifurcation fault associated with tsunami generation, and at the same time, observe the state of strain energy accumulation and seismic activity. Is also possible.In the future, it will be connected to the earthquake and tsunami observation and monitoring system "DONET2" installed on the deep sea floor around the Nankai Trough, and will acquire in-hole observation data in real time.
The purpose of the research at this point is to penetrate one of the major faults branching from the seismic fault that is said to cause the Tonankai earthquake, and to realize continuous intrawell monitoring, Genius Plug 2011. We have also obtained data such as the XNUMX off the Pacific coast of Tohoku Earthquake, and it is expected that detailed analysis of the data will lead to a better understanding of the process that causes earthquakes and tsunamis.
