Lakagigar fissure eruption. The 1783-84 Laka- gigar eruption resulted in a great famine, due to which Iceland lost 20% of its population.| J-STAGE
Gullfoss waterfall. The two-step cataract has a total drop of 32 m.| J-STAGE
Geyser Strokkur. The geyser erupts at 5-10 minute intervals.| J-STAGE
The braided course of the Jokulfell downstream from Hofsjokull.| J-STAGE
Jokulsarlon lagoon. The Breidamerkurjokull glacier has been retreating since about 1920. The lagoon formed at the glacial front shows a yearly increase.| J-STAGE
Reykjavik is a smokeless city. Almost 100% of the electricity and the heating depends upon hydropower and geothermal energy.| J-STAGE
Palagonite ridge formed by subglacial eruption. Langjokull glacier in the background.| J-STAGE
Dettifoss waterfall. The waterfall is 44 m high. The river water is rich in suspended sediments and the waterfall volume is the greatest in Iceland.| J-STAGE
Normal fault at Thingvellir. The boundary between the North American plate on the left-hand side and the Eurasian to the right.| J-STAGE
Basaltic lava field, the Svartshengi geothermal power plant (right), and the Blue Lagoon (left).| J-STAGE
Valley of Eldgja. The 934-40 Eldgja eruption occurred along a 75 km-long fissure.| J-STAGE
Earth hummock. Earth hummocks are among the periglacial phenomena. The knoll covered with vegetation is |about 0.5 m high.| J-STAGE

Latest Issue

Journal of Geography (Chigaku Zasshi), 2017 Vol.126 No.4

2017 Vol.126 No.4

Honeycomb Weathering (Tafoni) of Sandstone along the Tatsukushi-Minokoshi Coast, Kochi Prefecture

Rocky coasts composed of sandstone and tuff often show a honeycomb structure, large forms of which are designated tafoni. The cavernous structure prevails in the wave-splash zone where wave erosion is weak but wave splashes frequently provide seawater. Granular disintegration by salt weathering is likely to produce the structure, although the origins of the honeycomb geometry are unclear. The sizes of holes depend on pore structure and rock strength, as well as the duration of exposure to salt weathering.

(Photograph and Explanation: Norikazu MATSUOKA Photographed on December 28, 2005)

Special Issue: Rock Weathering from Nanoscale to Global Scale:
2. Macroscopic Weathering and Applied Studies

Overview of the Special Issue “Rock Weathering from Nanoscale to Global Scale:
　2. Macroscopic Weathering and Applied Studies”

Norikazu MATSUOKA, Chiaki T. OGUCHI, Keisuke FUKUSHI,
Yuki MATSUSHI and Tadashi YOKOYAMA

Journal of Geography (Chigaku Zasshi), 2017, 126(4), 407.

DOI:10.5026/jgeography.126.407

Introduction to the Special Issue “Rock Weathering from Nanoscale to Global Scale:
　2. Macroscopic Weathering and Applied Studies”

Norikazu MATSUOKA, Chiaki T. OGUCHI, Keisuke FUKUSHI,
Yuki MATSUSHI and Tadashi YOKOYAMA

Journal of Geography (Chigaku Zasshi), 2017, 126(4), 409.

DOI:10.5026/jgeography.126.409

A Study on Coastal Cliff Recession Processes
　with Special Reference to the Development of Shore Platforms:
　Approach Using a Masonry Seawall Composed of Sandstone Blocks
　(Original Article)

Hisashi AOKI

Journal of Geography (Chigaku Zasshi), 2017, 126(4), 413.

DOI:10.5026/jgeography.126.413

Relationships between Formative Processes of Notches and Tafoni Developing
　on Steep Slopes of Volcanic Breccia and Occurrences of Rock Falls:
　A Case at Mt. Gokenzan, Takamatsu City, Kagawa Prefecture, Japan
　(Short Article)

Ken-ichi NISHIYAMA, Shuichiro YOKOTA, Shuichi HASEGAWA
and Daisuke KANBARA

Journal of Geography (Chigaku Zasshi), 2017, 126(4), 425.

DOI:10.5026/jgeography.126.425

Environmental Factors of Seasonal Changes in Salt Efflorescence Observed
　on Building Stones Used at Orval Abbey, Southern Belgium (Original Article)

Yuko OSAWA, Chiaki T. OGUCHI, Céline THOMACHOT-SCHNEIDER,
Maxime GOMMEAUX, Stéphanie EYSSAUTIER and Gilles FRONTEAU

Journal of Geography (Chigaku Zasshi), 2017, 126(4), 439.

DOI:10.5026/jgeography.126.439

Weathering Rates of Stone-built Heritages (Review Article)

Tetsuya WARAGAI

Journal of Geography (Chigaku Zasshi), 2017, 126(4), 455.

DOI:10.5026/jgeography.126.455

Rates of Weathering Layer Development:
　A Review of Studies on Weathering Rind, Weathering Crust, and Rock Varnish
　(Review Article)

Chiaki T. OGUCHI

Journal of Geography (Chigaku Zasshi), 2017, 126(4), 473.

DOI:10.5026/jgeography.126.473

Quantification of Long-term Rates of Bedrock Weathering and Soil Production
　Using Terrestrial Cosmogenic Nuclides:
　Principles, Methodology, Current Research Status, and Perspectives
　(Review Article)

Yuki MATSUSHI

Journal of Geography (Chigaku Zasshi), 2017, 126(4), 487.

DOI:10.5026/jgeography.126.487

Global Climate Change and Weathering during the Phanerozoic (Review Article)

Hirohiko KASHIWAGI

Journal of Geography (Chigaku Zasshi), 2017, 126(4), 513.

DOI:10.5026/jgeography.126.513

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