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The science of Jeju’s Hanon craterA brief review of the proceedings of International Symposium for Conservation & Restoration of Hanon Crater
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승인 2010.12.16  15:59:41
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▲ Many local residents also attended the International Symposium for Conservation & Restoration of Hanon Crater on Nov. 26. Photo by Yang Ho Geun

The International Symposium for Conservation & Restoration of Hanon Crater was held at Samda Hall of the International Convention Center Jeju in Seogwipo City, on Nov. 26.

During the opening ceremony, Seogwipo Mayor Ko Chang Hu said, “Jeju Island wishes to identify the importance and value of the Hanon Crater, the biggest and only maar crater on the Korean peninsula, which has archived information of primitive life and the secret of ancient life and climate.”

He added, “Jeju thus aims to utilize future climate change through analyzing the record of the environment of ancient times.”

Dr. Achim Brauer (GFZ German Research Centre for Geosciences, Potsdam), Prof. Yoon Seok Hoon (Jeju National University) and Liu Jiaqi (Chinese Academy of Sciences) made presentations during Session I of the symposium.

Firstly, Dr. Brauer read a paper on the subject titled “Maar lake sediments as ideal archives for climate and environment reconstruction at seasonal scales.”

“Developing scenarios for future climatic evolution cannot be achieved through calculating the effects of the anthropogenic increase in greenhouse gases alone, but needs to additionally consider ongoing natural climate change,” he said. “However, the natural triggers of climate change and even more the mechanisms how extraterrestrial and internal processes affect the climate system are still poorly understood,” stating that an “overview on varved maar lake sediments and their potential as ideal recorders of past climatic and environmental changes.”

Secondly, Prof. Yoon Seok Hoon spoke on the topic of “Origin and Evolution of the Hanon Crater.”

“The volcano has the largest crater in Jeju Island, of which the diameter of the rim-to-rim width is 1~1.2 kilometer and the altitudinal contrast between the crater rim and the crater floor is up to 90 meters,” he said. “The crater has a nested scoria cone at the center and is surrounded by thin and gently outward-dipping rim beds of a tuff ring.”

Thirdly, Liu Jiaqi presented “The climate evolution since the deglacial recorded in Longwan Maar lakes in Jilin Province.”

In Session II, Prof. Sohn Yong Gwan (Gyeonsang University), Prof. Hiroyuki Kitagawa (Nagoya University, Japan), Dr. Martin Koziol (Maarmuseum Manderscheid) and Prof. Woo Kyung Sik (Gangwon University) made presentations.

Firstly, Prof. Sohn Yong Gwan read a paper titled “Geodiversity and geoheritage values of hydro-magmatic volcanoes in Jeju Island, Korea, a world-class showcase of basaltic hydrovolcanism.”

“Hanon volcano is also interpreted to have been a water-filled maar crater surrounded by tephra ring, preserving paleoclimatic records of the Late Pleistocene. These differences make the Hanon volcano a very likely geosite candidate for the Jeju Global Geopark in the near future.”

Secondly, Prof. Hiroyuki Kitagawa spoke on the topic about “Maar sediments on Jeju Island as an achieve of the past atmospheric circulations over East Asia.”

Thirdly, Dr. Martin Koziol presented “Eifel-Maars as a stimulant of Geo-tourism for regional economic development.”

“The geological term ‘maar’ was first used in the Eifel, an area in Germany, in 1819 by the world famous nature scientist Alexander von Humbold. After further scientific research it was proven that these beautiful round funnel shaped holes in the ground are a certain type of volcano.”

Finally, Prof. Woo Kyung Sik read a paper on the subject titled “The Hanon Crater: Strategic Development for the Promotion of Geotourism.”

“The Hanon Crater is a potential future geosite in Jeju Global Geopark. Because the Hanon Crater is geographically very close to the seogwipo formation and Cheonjiyeon waterfall geosites, the Hanon Crater geosite should be include as a Seogwipo Geocluster.”

After the presentations, a panel discussion was held at Samda Hall, attended by Prof. Kim Yong Sik (Youngnam University, Chairman of IUCN SSC KPSG), Prof. Hyun Sang Min (KORDI), Kim Bu Il (Deputy Governor of Environment, Jeju Special Self-Governing Province) and Noh Young Dae (Director of Korea Nature Information Researcher Institute).

ⓒ Jeju Weekly 2009 (
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