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Journal of Geography (Chigaku Zasshi), 2017 Vol.126 No.2

2017 Vol.126 No.2

Seafloor Topography Caused by Plate Bending Just Prior to Subduction, Observed at the Pacific Plate off the North-eastern Japan Arc

When a rigid, elastic oceanic plate subducts from a trench, an outer bulge is formed due to flexure of the elastic plate. In addition, rough seafloor topographic features caused by plate bending-related normal faulting, such as horst and graben structures, are observed in the vicinity of the trench axis.
(Above) Schematic illustration of plate subduction in the north-western Pacific margin.
(Bottoms) Bathymetric maps around the Japan trench at northern latitudes of 37-41 degrees (from off-Miyagi to-off-Aomori). Left bottom, water depth; middle bottom, inclination of slope; right bottom; aspect of slope.
* Bathymetric data are ETOPO1 (above), and a compilation of multi-narrow beam echo sounder data collected by Japan Coast Guard and JAMSTEC (bottoms).

(Illustration & Explanation: Gou FUJIE and Shigeaki ONO)


Special Issue: The Forefront of Subducting Oceanic Plate Science:
Oceanic Drilling in the Outer Rise Region

Overview of the Special Issue “The Forefront of Subducting Oceanic Plate Science:
 Oceanic Drilling in the Outer Rise Region”

Shigeaki ONO

Journal of Geography (Chigaku Zasshi), 2017, 126(2), 105.

DOI:10.5026/jgeography.126.105

Introduction to the Special Issue
 “The Forefront of Subducting Oceanic Plate Science:
 Oceanic Drilling in the Outer Rise Region”

Shigeaki ONO

Journal of Geography (Chigaku Zasshi), 2017, 126(2), 109.

DOI:10.5026/jgeography.126.109

Outer-rise Seismology:
 Crustal Structure and Seismic Activity of the Incoming Pacific Plate
 in the Trench-Outer Rise Region (Review Article)

Koichiro OBANA and Gou FUJIE

Journal of Geography (Chigaku Zasshi), 2017, 126(2), 113.

DOI:10.5026/jgeography.126.113

Bending-related Topographic Structures of the Incoming Oceanic Plate
 at the Northwestern Pacific Ocean Trench (Review Article)

Masao NAKANISHI

Journal of Geography (Chigaku Zasshi), 2017, 126(2), 125.

DOI:10.5026/jgeography.126.125

Heat Flow Anomalies near Trenches:
 Heat Transport by Fluid Circulation in Oceanic Crust (Review Article)

Makoto YAMANO and Yoshifumi KAWADA

Journal of Geography (Chigaku Zasshi), 2017, 126(2), 147.

DOI:10.5026/jgeography.126.147

Geochemistry of the NW Pacific Plate:
 Origins of Indian and Pacific Mantles and Nature
 of Their Boundary (Review Article)

Jun-Ichi KIMURA, Takashi MIYAZAKI, Qing CHANG,
Bogdan S. VAGLAROV and Ryoko SENDA

Journal of Geography (Chigaku Zasshi), 2017, 126(2), 163.

DOI:10.5026/jgeography.126.163

Dots-and-Lines Approach to Subduction Volcanism and Tectonics (Original Article)

Mie ICHIHARA, Claudia ADAM, Valérie VIDAL,
Pablo GROSSE, Kenji MIBE and Yuji ORIHASHI

Journal of Geography (Chigaku Zasshi), 2017, 126(2), 181.

DOI:10.5026/jgeography.126.181

Geochemical/Petrological Interactions
 between Subducting Lithosphere and Petit-spot Magmas (Review Article)

Naoto HIRANO

Journal of Geography (Chigaku Zasshi), 2017, 126(2), 195.

DOI:10.5026/jgeography.126.195

Relationship between Heterogeneity of Plate Interface
 and Seismicity at Subduction Zones:
 The Japan Trench and Hikurangi Subduction Zones as Examples (Review Article)

Kimihiro MOCHIZUKI

Journal of Geography (Chigaku Zasshi), 2017, 126(2), 207.

DOI:10.5026/jgeography.126.207

Evaluating Stress State, Physical Properties, and Rupturing Behavior
 of Seismogenic Faults through Scientific Drillings (Review Article)

Weiren LIN, Takehiro HIROSE, Wataru TANIKAWA and Yohei HAMADA

Journal of Geography (Chigaku Zasshi), 2017, 126(2), 223.

DOI:10.5026/jgeography.126.223

Overview of the Drilling Project on the Bend-fault Hydrology
 in Old Incoming Plate (Review Article)

Tomoaki MORISHITA, Gou FUJIE, Makoto YAMANO, Masao NAKANISHI,
Koichiro OBANA, Yasuyuki NAKAMURA, Saneatsu SAITO, Shuichi KODAIRA,
Jun-ichi KIMURA, Junichiro KURODA and Shigeaki ONO

Journal of Geography (Chigaku Zasshi), 2017, 126(2), 247.

DOI:10.5026/jgeography.126.247

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