Basaltic lava field, the Svartshengi geothermal power plant (right), and the Blue Lagoon (left).| J-STAGE
Geyser Strokkur. The geyser erupts at 5-10 minute intervals.| 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
The braided course of the Jokulfell downstream from Hofsjokull.| J-STAGE
Palagonite ridge formed by subglacial eruption. Langjokull glacier in the background.| J-STAGE
Reykjavik is a smokeless city. Almost 100% of the electricity and the heating depends upon hydropower and geothermal energy.| J-STAGE
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
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
Gullfoss waterfall. The two-step cataract has a total drop of 32 m.| 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
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), 2019 Vol.128 No.3

2019 Vol.128 No.3

The 2018 Eruption of Kīlauea Volcano, Hawai'i, Shows Different Types of Surface Deformation Observed with the Cumulative Deformation from the Sentinel -1 Time Series and a Single ALOS-2 Interferogram

The Sentinel-1 time series (ascending track 124, April 20 –August 24, 2018) covers the entire volcano, but loses coherence due to vegetation at its C-band radar frequency. The ALOS-2 portion of the image (to the right of the LERZ label) covers the Lower East Rift Zone (LERZ) from track 089, between January 20 and May 22 2018. Surface displacements are depicted at 12 cm per color - cycle. Fringe patterns (color cycles) SW of the Kīlauea summit show deflation from sources beneath the summit and its caldera. The Middle East Rift Zone (MERZ) pattern depicts deflation as magma from both the summit and the MERZ deflate, feeding the dike opening and lava effusion in the LERZ. Broad fringes towards the coast are related to the May 4, 2018 M6.9 earthquake beneath Kīlauea’s south flank.

Acknowledgements

Analysis performed at the Jet Propulsion Laboratory (JPL), California Institute of Technology under contract from the U.S. National Aeronautics and Space Administration (NASA). Sentinel -1 Copernicus data from the Copernicus Open Access Hub and the European Space Agency (ESA) and ALOS-2/PALSAR-2 data from the JAXA (Japan Aerospace Exploration Agency), were processed at JPL by the ARIA project. The ownership of ALOS-2/PALSAR-2 data belongs to JAXA.

(Cover: © 2019 JPL-Caltech; Data analysis and caption: Paul LUNDGREN,
Japanese explanation: Akiko TANAKA)

Review Article

Characteristics of Portable Core Samplers for Lake Deposit Investigations

Kota KATSUKI, Koji SETO, Yusuke SUGANUMA and Dong Yoon YANG

Journal of Geography (Chigaku Zasshi), 2019, 128(3), 359.

DOI:10.5026/jgeography.128.359

Original Article

Spatial Variations of b-value around Mount Fuji Influenced
　by the M_j 6.4 Eastern Shizuoka Earthquake of 15 March 2011

Takumi MURAKOSHI and Tomonari MIYASHITA

Journal of Geography (Chigaku Zasshi), 2019, 128(3), 377.

DOI:10.5026/jgeography.128.377

Onset Timing of Median Tectonic Line (MTL)
　Constraints from U‒Pb Ages of Detrital Zircons
　from 3 Distinct Cretaceous Sandstone Units Adjacent
　to the Low-angle MTL in the Mikawa-Ono/Idaira Area, Central Japan

Ryo HASEGAWA, Yukio ISOZAKI, Yukiko OHTOMO
and Yukiyasu TSUTSUMI

Journal of Geography (Chigaku Zasshi), 2019, 128(3), 391.

DOI:10.5026/jgeography.128.391

Heavy Rainfall-induced Displacement of More than 2.5 m
　in the Kushiro Marsh in 2016, Detected by ALOS-2 SAR

Satoshi FUJIWARA, Yu MORISHITA, Takayuki NAKANO, Yuji MIURA,
Yasuaki KAKIAGE, Hiroki MURAMATSU and Hiroshi UNE

Journal of Geography (Chigaku Zasshi), 2019, 128(3), 419.

DOI:10.5026/jgeography.128.419

Correlation between Alkaline Tephra (Hm-2 Tephra) Distributed
　on Hakusan Volcano, Central Japan and Tephras on Ulleung Island
　Based on Major Element Compositions and ¹⁴C Ages

Toshio HIGASHINO, Yusuke SODA and Mitsuru OKUNO

Journal of Geography (Chigaku Zasshi), 2019, 128(3), 439.

DOI:10.5026/jgeography.128.439

Short Article

Slip Rate of the Southern Part of the Itoigawa‒Shizuoka Tectonic Line Fault Zone
　at Tsukuyama, Minami-Alps City, Yamanashi Prefecture, Central Japan

Nobuhiko SUGITO, Akira FURUSAWA, Hiroshi SAWA,
Masayoshi TAJIKARA, Kaoru TANIGUCHI, Mitsuhisa WATANABE
and Yasuhiro SUZUKI

Journal of Geography (Chigaku Zasshi), 2019, 128(3), 453.

DOI:10.5026/jgeography.128.453

Letter

Teaching Materials on Determining Epicenters Using P Wave Lateral Polarity Data
　for Small Earthquakes in the Hida, Japan, Region
　before and after the 2011 off the Pacific Coast of Tohoku Earthquake

Kenji KAWAI and Takahiko UCHIDE

Journal of Geography (Chigaku Zasshi), 2019, 128(3), 465.

DOI:10.5026/jgeography.128.465

Erratum

Erratum: Japanese Translation of “Dr. J. Rein's Reise in Nippon, 1874” [Chigaku Zasshi (Journal of Geography) Vol. 127 (2018) , No. 6, p.805-822]

Naotoshi YAMADA and Michiko YAJIMA

Journal of Geography (Chigaku Zasshi), 2019, 128(3), 477a.

DOI:10.5026/jgeography.128.477a

Erratum: Cabbage Harvest in Tsumagoi Village on the Northern Slope of Mt. Asama [Chigaku Zasshi (Journal of Geography) Vol. 128 (2019) , No. 2, Cover]

Toshiaki NISHINO

Journal of Geography (Chigaku Zasshi), 2019, 128(3), 477b.

DOI:10.5026/jgeography.128.477b

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