Late Holocene uplift of the Izu Islands on the northern Zenisu Ridge off Central Japan

Late Holocene uplift of the Izu Islands on the northern Zenisu Ridge off Central Japan To clarify the Holocene uplift history of the Izu Islands, Japan, we analyze the elevations and 14C ages of emerged sessile assemblages measured by accelerator mass spectrometry (AMS) on the islands of Niijima, Jinaijima, Shikinejima, and Kouzushima, on the northern Zenisu Ridge. The results suggest that uplift events took place after AD 1950 (uplift event 1), during AD 786–1891 (uplift event 2), during AD 600–1165 (uplift event 3), and during AD 161–686 (uplift event 4), although uplift events 3 and 4 are identified only at Kouzushima. The minimum amount of uplift was estimated to be 0.4–0.9 m in uplift event 1, 2.4–2.7 m in uplift event 2, 3.6 m in uplift event 3, and 3.3–8.1 m in uplift event 4. These events could have been caused by volcanic activity or strong earthquakes. There also remains the possibility that uplift event 2 was caused by the AD 1498 Meio earthquake; in contrast to the previous interpretation, the ages of uplift events are significantly older than the earthquake, based on conventional (non-AMS) methods. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Progress in Earth and Planetary Science Springer Journals

Late Holocene uplift of the Izu Islands on the northern Zenisu Ridge off Central Japan

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Publisher
Springer Journals
Copyright
Copyright © 2017 by The Author(s).
Subject
Earth Sciences; Earth Sciences, general; Geophysics/Geodesy; Planetology; Biogeosciences; Hydrogeology; Atmospheric Sciences
eISSN
2197-4284
D.O.I.
10.1186/s40645-017-0146-5
Publisher site
See Article on Publisher Site

Abstract

To clarify the Holocene uplift history of the Izu Islands, Japan, we analyze the elevations and 14C ages of emerged sessile assemblages measured by accelerator mass spectrometry (AMS) on the islands of Niijima, Jinaijima, Shikinejima, and Kouzushima, on the northern Zenisu Ridge. The results suggest that uplift events took place after AD 1950 (uplift event 1), during AD 786–1891 (uplift event 2), during AD 600–1165 (uplift event 3), and during AD 161–686 (uplift event 4), although uplift events 3 and 4 are identified only at Kouzushima. The minimum amount of uplift was estimated to be 0.4–0.9 m in uplift event 1, 2.4–2.7 m in uplift event 2, 3.6 m in uplift event 3, and 3.3–8.1 m in uplift event 4. These events could have been caused by volcanic activity or strong earthquakes. There also remains the possibility that uplift event 2 was caused by the AD 1498 Meio earthquake; in contrast to the previous interpretation, the ages of uplift events are significantly older than the earthquake, based on conventional (non-AMS) methods.

Journal

Progress in Earth and Planetary ScienceSpringer Journals

Published: Oct 18, 2017

References

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