地学雑誌 | Journal of Geography (Chigaku Zasshi)

2014 Vol.123 No.5

Summit Crater-lake of Pinatubo Volcano Viewed from the Northern Rim of the Crater

The 2.5-kilometer-wide summit crater of Pinatubo volcano (1486 m asl), located about 90 km northwest of Metro Manila, central Luzon, was formed by a climactic eruption on June 15, 1991. In 2014, we can climb to the summit along the O'Donnell River on the northern slope within one day. This photo was taken in April 2006 from northern crater rim where this route terminates. The lake extends behind the cliff to the left. After the climactic eruption, a lava dome formed within the crater, which has been submerged in the lake. The lake water is an impressive cobalt blue. Hot springs are discharging from the bottom of the lake and the shore. The significant fracture rock mass in the background is the remaining part of the lava dome formed before the eruption. The people on the lakeshore in the foreground are tourists with a guide enjoying a beautiful crater-lake.

(Photograph and explanation: Mitsuru OKUNO and Tetsuo KOBAYASHI)

Original Articles

Changes to River System and Faulting in the Ikachi Basin and Surrounding Area in the Southwestern Part of the Chugoku Mountains, Southwest Japan

Kazuhiko YAMANOUCHI, Ken-ichirou SHIRAISHI and Tohru DANHARA

Journal of Geography (Chigaku Zasshi), 2014, 123(5), 643.

DOI:10.5026/jgeography.123.643

Characteristics of Tephras Interbedded with the Holocene Sediments on the Sanriku Coast, Northeast Japan

Daisuke ISHIMURA, Keitaro YAMADA, Takahiro MIYAUCHI and Ryosuke HAYASE

Journal of Geography (Chigaku Zasshi), 2014, 123(5), 671.

DOI:10.5026/jgeography.123.671

Chronology and Process of Fluvial Terrace Formation in the Eastern and Western Parts of the Ohmi Basin

Daisuke ISHIMURA

Journal of Geography (Chigaku Zasshi), 2014, 123(5), 698.

DOI:10.5026/jgeography.123.698

Short Article

Tectonic Geomorphology and Late Pleistocene Activity of Western Marginal Faults of the Suzuka Mountains, Central Japan: Consistency of Small Tectonic Scarps and Subsurface Geological Structures Revealed by Seismic Reflection Surveys

Tadaki MIZUMOTO, Takashi AZUMA, Hiroyuki TSUTSUMI, Hideaki GOTO, Masayoshi TAJIKARA, Takashi NAKATA and Tokihiko MATSUDA

Journal of Geography (Chigaku Zasshi), 2014, 123(5), 721.

DOI:10.5026/jgeography.123.721

Special Issue on “Geology and Recent Eruptions of Irosin Caldera and Bulusan Volcano, Southern Luzon, Philippines (Part II)”

Overview of the Special Issue on “Geology and Recent Eruptions of Irosin Caldera and Bulusan Volcano, Southern Luzon, Philippines”

Mitsuru OKUNO, Renato U. SOLIDUM Jr., Ma. Hannah T. MIRABUENO, Christopher G. NEWHALL, Nobuo GESHI, Toshihiko SUGAI, Akiko TANAKA and Tetsuo KOBAYASHI

Journal of Geography (Chigaku Zasshi), 2014, 123(5), 733.

DOI:10.5026/jgeography.123.733

Comparative Study on Eruption Sequences during the Caldera-forming Eruptions of Aira and Irosin Calderas (Review Article)

Tetsuo KOBAYASHI

Journal of Geography (Chigaku Zasshi), 2014, 123(5), 739.

DOI:10.5026/jgeography.123.739

Stratigraphy and AMS Radiocarbon Dates of Cored Sediments (IrBH-2) from the Irosin Caldera, the Philippines (Short Article)

Ma. Hannah T. MIRABUENO, Masayuki TORII, Eduardo P. LAGUERTA, Perla J. DELOS REYES, Toshiyuki FUJIKI, Ericson B. BARISO, Mitsuru OKUNO, Toshio NAKAMURA, Tohru DANHARA, Yoko SAITO-KOKUBU and Tetsuo KOBAYASHI

Journal of Geography (Chigaku Zasshi), 2014, 123(5), 751.

DOI:10.5026/jgeography.123.751

Fallout Tephras of the 2006-2007 Eruptions of the Bulusan Volcano, Southern Luzon, Philippines (Original Article)

Perla J. DELOS REYES, Ma. Antonia V. BORNAS, Ma. Carmencita B. ARPA, Eduardo LAGUERTA, Mabelline T. CAHULOGAN, Raymond Patrick R. MAXIMO, Ma. Hannah T. MIRABUENO, Jeffrey S. PEREZ, Bella S. TUBIANOSA and Renato U. SOLIDUM, Jr.

Journal of Geography (Chigaku Zasshi), 2014, 123(5), 761.

DOI:10.5026/jgeography.123.761

Image Recordings of Eruption Clouds at Bulusan and Mayon Volcanoes, Philippines (Short Article)

Kisei KINOSHITA and Eduardo P. LAGUERTA

Journal of Geography (Chigaku Zasshi), 2014, 123(5), 776.

DOI:10.5026/jgeography.123.776

Pictorial

Pictorial 1: Hot and Cold Springs in the Bulusan Volcanic Complex, Southern Luzon, Philippines

Sachihiro TAGUCHI, Ramil Lelay VAQUILAR, Eduardo P. LAGUERTA, Mariton A. V. BORNAS, Renato U. SOLIDUM Jr., Perla J. DELOS REYES, Ma. Hannah T. MIRABUENO, Arturo S. DAAG, Ericson B. BARISO and Mitsuru OKUNO

Journal of Geography (Chigaku Zasshi), 2014, 123(5), xiii.

DOI:10.5026/jgeography.123.xiii