During the meeting, Yang Houlan, chief of the Trilateral Cooperation Secretariat, stressed the importance of research cooperation for sustainable development of the region.

The experts discussed the issue of active faults, which drew attention in South Korea last year, when the country experienced its strongest earthquake ever in Gyeongju, some 371 kilometers southeast of Seoul.

They agreed to implement the joint research on the Yangsan fault in South Korea, the Tan-Lu fault in China and an active fault running through the middle of Japan's main island of Honshu.

It marks the first time for the three countries to conduct a joint research on the field of geology.

The three countries also agreed to continue cooperation in extracting and commercializing natural gas hydrates, a chemically stable crystalline substance that resembles sherbet.

The Chinese side gave a presentation on its extraction of samples of natural gas hydrate for the first time in the South China Sea, while South Korea's Trade, Industry and Energy Ministry formed a business cooperation deal with the China Geological Survey on the research, development and production of natural gas hydrates.

The three countries will hold the next round of the biennial meeting, which was inaugurated in 2015 in Beijing, in Japan in 2019. (Yonhap)