2011 Fiscal Year Final Research Report
Explanation of volcanic activity by detailed terrace chronology and crustal deformation observation in Io To Island in Ogasawara Archipelago
| Project/Area Number |
21510193
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Research Field |
Natural disaster science
|
|---|
| Research Institution | 国土地理院 (2011)
Geospatial Information Authority of Japan (Geography and Crustal Dynamics Research Center) (2009-2010) |
|---|
Principal Investigator |
IMAKIIRE Tetsuro 国土地理院, 地理地殻活動研究センター, 総括研究官 (60370805)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
NAKANO Takayuki 国土地理院, 地理地殻活動研究センター, 研究官 (60511962)
SASAKI Keiichi 金沢学院大学, 美術文化学部, 准教授 (50340021)
|
|---|
| Co-Investigator(Renkei-kenkyūsha) |
KOARAI Mamoru 国土地理院, 地理地殻活動研究センター, 室長 (50419876)
SATO Hiroshi 国土地理院, 地理地殻活動研究センター, 主任研究官 (60360468)
OTOI Kosei 国土地理院, 地理地殻活動研究センター, 主任研究官 (60581684)
|
|---|
| Research Collaborator |
OOI Shinzo 国土地理院, 総務部, 係員
YARAI Hiroshi 国土地理院, 測地観測センター, 地震調査官
|
|---|
| Project Period (FY) |
2009 – 2011
|
| Keywords | 火山噴火 |
|---|
| Research Abstract |
We carried out detailed chronological study on the coastal terraces in Io To island, in Ogasawara Archipelago. By means of<14>^C radiocarbon dating on the fossils of coral and carbonized wood, we estimated the history of the terrace formation, which shows the uplift of Io To Island should be intermittent, not be constant as suggested in the former study(Kaizuka et al, 1985). Recent uplift observed by GPS survey is so rapid that it could be comparable to the remarkable uplift about 500 years ago, when Mt. Motoyama upper terrace was formed, accompanied by the eruption of Mt. Suribachi-yama. This notable crustal deformation suggests following volcanic activities. We can propose a model that notable uplift by the possible magma intrusion would occur before the remarkable volcanic activity of Io To islands, from this study.
|
Research Products
(3 results)
