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 No. *.

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iv

BULLETIN OF THE VOLCANOLOGICALSOCIETY OF JAPANVol. /+ Contents
No. +ArticlesVolcanic Activities of Kuchinoerabujima Volcano within the Last -*,*** YearsῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌNobuo GESHI and Tetsuo KOBAYASHIῌ

+

Ground Deformation Detection at Kuchinoerabujima Volcano by Continuous GPS with Simple
Atmospheric Correction ῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌEiji SAITO and Masato IGUCHIῌ,+K-Ar Dating of Kimpo Volcano, Northern Ryukyu ArcῌῌῌῌῌῌῌῌῌῌῌῌῌῌKiyoshi TOSHIDA, Kozo UTO and Akikazu MATSUMOTOῌ

-+Letter
A New Seismic Observation System at the Kusatsu-Shirane VolcanoῌῌῌῌῌTakehiko MORI, Jun’ichi HIRABAYASHI, Kenji NOGAMI and Shin’ya ONIZAWAῌ

.+Special Section : The ,**. Eruption of Asama Volcano (-)
ArticlesCrystal Size Distribution and Crystallization Process of the Ejecta from the September ,**.
Eruptions of the Asama Volcano, Central Japan
ῌῌῌῌTatsuro TSUGANE, Kuniaki MAKINO, Yasuyuki MIYAKE and Kou TAKAHASHIῌ

.3

Impact Crater Distribution Map of the Eruption of Asama Volcano on September +, ,**. Using
High-resolution Satellite Imagery ῌῌῌῌῌῌῌῌHisashi SASAKI and Sakae MUKOYAMAῌ

0-Time Variation of Volcanic Plume Related with the Eruptions of Asama Volcano in ,**.
ῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌTsuneomi KAGIYAMA and Etsuro KOYAMAῌ

1/Ground Tilt Change Associated with the ,**. Eruption at Asamayama Volcano, JapanῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌMasaaki CHUREI and Hiroaki KATAYAMAῌ

3+

Photogravure
Volcanic Structure and Geology of Kuchinoerabujima VolcanoῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌNobuo GESHI and Tetsuo KOBAYASHIῌ +*News
Volcanic Activity in Japan, during November῍December, ,**/ ῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌ +*1
Miscellaneous News ῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌ ++*No. ,Articles
Precise Hypocenter Determination for Volcanic Earthquakes Observed at Asama Volcano, JapanῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌJun OIKAWA, Yoshiaki IDA and Hiroshi TSUJIῌ ++1

v
Letters
Seismic Activity and Tilt Change Obsereved before the Middle Scale Eruptions of Asama Volcanoin ,**. ῌῌῌῌῌῌῌῌῌῌῌῌῌJun FUNASAKI, Hirohito NAITO, Tomoyuki KAN’NO,Makoto MIYASITA, Shin TIKAZAWA, Yoshihiro UEDA and Sei IIJIMAῌ +,/Determination of Concentration of Total Sulfur Species and Estimation of Concentration ofPoly-thionate Ions in Yugama, a Crater Lake of Kusatsu-Shirane VolcanoῌῌῌῌῌῌῌῌῌῌῌῌYoshikazu KIKAWADA, Hideki FUKUHARA, Sawako NOMURA,Noriko KIKAWA, Aya INOUE, Takao OI and Joyo OSSAKAῌ +-/Book Review
Book Review : Volcanic Earthquakes and Tremor in Japan by Takeshi NISHIMURA and Masato
IGUCHI ῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌMotoo UKAWAῌ +.+News
Volcanic Activity in Japan, during January῍February, ,**0 ῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌ +.Miscellaneous News ῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌ +.1Obituary
To the Memories of Dr. Teruki NISHIMURA ῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌKunihisa TERAIῌ +.3Appendix : ῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌiNo. -Articles
Measurement of Water Dissolved in the Groundmass Glass in the Ejecta of the September ,**.
Eruptions from the Asama Volcano, Central JapanῌῌῌῌῌKuniaki MAKINO, Tatsuro TSUGANE, Takafumi SONEHARA and Yasuyuki MIYAKEῌ +/+-D Magnetic Structure of Miyakejima Volcano before and after the Eruption in ,***
ῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌYoshio UEDAῌ +0+
LetterMagnetization Intensity Distribution in the Western Unzen Region, Kyushu, Japan, Inferred froma Helicopter-borne Aeromagnetic Survey ῌῌῌῌῌῌAyako OKUBO, Yoshikazu TANAKA,Tsuneomi KAGIYAMA, Mitsuru UTSUGI and Wataru KANDAῌ +1/Scientiﬁc Communication
Report on the .th Meeting of Cities on Volcanoes in QuitoῌῌῌῌῌSetsuya NAKADA, Hiroyuki KUMAGAI, Takeshi MATSUSHIMA, Hiroshi SUWA,Hideki UEDA, Yasuhiro ISHIMINE, Jun OKADA, Tadahide UI and Yuhki KOHNOῌ +2Proceedings of the Society ῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌ +23
News
Volcanic Activity in Japan, during March῍April, ,**0ῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌ ,*/Miscellaneous News ῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌ ,*3
Information on ,**0 Fall Annual Meeting

vi

No. .

ArticlesEruption Products and Structure of Katsuma-Yama Volcano, Okushiri Island, Hokkaido, NorthernJapan ῌῌῌῌῌῌῌῌῌῌῌῌῌKazuhiko KANO, Yohei YOSHIMURA, Daizo ISHIYAMA,Geo#rey J. ORTON and Takeshi OHGUCHIῌ ,++A Pyroclastic Flow Deposit Occurring at the Northeastern Foot of Nakadake, Aso Volcano(Japan) and its Stratigraphic SigniﬁcanceῌῌῌῌῌῌῌῌῌῌYasuo MIYABUCHI, Kazunori WATANABE and Yoshitaka EGAWAῌ ,-+The Owakidani Tephra Group : A Newly Discovered Post-magmatic Eruption Product of Hakone
Volcano, Japan ῌῌῌῌῌῌῌMakoto KOBAYASHI, Kazutaka MANNEN, Mitsuru OKUNO,Toshio NAKAMURA and Kazuo HAKAMATAῌ ,./Pyroclastic Density Current from the Caldera-forming Eruption of Izu-Oshima Volcano, Japan :Restudy of the Sashikiji , Member Based on Stratigraphy, Lithofacies, and Eruption AgeῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌTakahiro YAMAMOTOῌ ,/1LetterThermal Surveillance of the Asama ,**.ῌ,**/ Activity Using MODIS Nighttime Infrared ImagesῌῌῌῌῌῌῌTakayuki KANEKO, Kenji TAKASAKI, Atsushi YASUDA and Yosuke AOKIῌ ,1NewsVolcanic Activity in Japan, during May῍June, ,**0 ῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌ ,2Miscellaneous News ῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌ ,20Japan Geoscience Union News No. *-No. /Articles
Ground Deformation and Magma Reservoir at Aso Volcano : Location of Deﬂation Source Derivedfrom Long-term Geodetic Surveys ῌῌῌῌῌῌῌῌῌῌῌYasuaki SUDO, Tomoki TSUTSUI,Makoto NAKABOH, Miyuki YOSHIKAWA, Shin YOSHIKAWA and Hiroyuki INOUEῌ ,3+Reconsideration of the +3** Explosive Eruption at Adatara Volcano, Northeastern Japan
ῌῌῌῌAkihiko FUJINAWA, Takeshi KAMOSHIDA, Atsushi TANASE, Kazuki TANIMOTO,Youichi NAKAMURA and Kazuo KONTANIῌ -++Frequent and Intensive Eruptions in the 3th Century, Izu Islands, Japan : Revision of VolcanoStratigraphy Based on Tephras and Historical DocumentῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌMasashi TSUKUI, Koichiro SAITO, Kouichiro HAYASHIῌ -,1NewsVolcanic Activity in Japan, during July῍August, ,**0 ῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌ --3
Miscellaneous News ῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌ -.+Obituary
To the Memories of Dr. Tatsunori SOYA ῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌKohei KAZAHAYAῌ -./vii
Photogravure
The Eruption of Meakandake Volcano on March ,+, ,**0, Hokkaido, Japan῍῍῍῍῍῍῍῍῍῍῍῍῍῍῍Hisashi SASAKI, Chiaki INABA and Sakae MUKOYAMA῍ -.1No. 0Articles
Holocene Pyroclastic Fall Deposits along the Paciﬁc Coastal Region of Eastern Hokkaido῍῍῍῍῍῍῍῍῍῍῍῍῍῍῍῍῍῍῍῍῍Ryuta FURUKAWA, Futoshi NANAYAMA῍ -/+Review
Syneruptive magma ascent revealed by crystallization processesῌRecent progresses with decompression experimentsῌ ῍῍῍῍῍῍῍῍῍῍῍῍῍῍῍῍῍῍῍῍῍῍῍῍Yuki SUZUKI῍ -1Book Review
Book Review : Regional Geomorphology of the Japanese Islands. Vol. / Geomorphology of ChubuRegion. edited by Hiroshi MACHIDA et al. ῍῍῍῍῍῍῍῍῍῍῍῍῍Yasuyuki MIYAKE῍ -3Titles of Papers Presented at the Meeting of the Society,**0 Spring Meeting῍῍῍῍῍῍῍῍῍῍῍῍῍῍῍῍῍῍῍῍῍῍῍῍῍῍῍῍῍῍῍῍῍ -3/,**0 Fall Meeting῍῍῍῍῍῍῍῍῍῍῍῍῍῍῍῍῍῍῍῍῍῍῍῍῍῍῍῍῍῍῍῍῍῍῍ -33
Proceedings of the Society ῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌ .*1NewsVolcanic Activity in Japan, during September῎October, ,**0 ῍῍῍῍῍῍῍῍῍῍῍῍῍῍῍῍ .+/Miscellaneous News ῍῍῍῍῍῍῍῍῍῍῍῍῍῍῍῍῍῍῍῍῍῍῍῍῍῍῍῍῍῍῍῍῍῍ .+1Obituary
To the Memories of Dr. Norimichi MATSUO ῍῍῍῍῍῍῍῍῍῍῍῍῍῍῍῍Kazuya OHTA῍ .+3Appendix ; Vol. /+ (No. +ῌNo. 0) ContentsῌAuthor Index ῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌῌJapan Geoscience Union News No. *.

i