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.
Highlights
Fukutomi (1935, 1938) discovered emerged sessile assemblages on Shikinejima and Jinaijima within the Izu Islands and in southern Izu Peninsula, Central Japan (Figs. 1 and 2)
Kitamura et al (2016) examined the faunal compositions and accelerator mass spectrometry (AMS) 14C ages of emerged sessile assemblages in the southern part of Izu Peninsula and concluded that coseismic uplift occurred in the periods 1256– 950 BC, 1000–1270 AD, 1430–1660 AD, and 1506– 1815 AD
The upper limit of living S. kegaki is + 0.4 m amsl, while living specimens of C. gigas could not be found
Summary
Fukutomi (1935, 1938) discovered emerged sessile assemblages on Shikinejima and Jinaijima within the Izu Islands and in southern Izu Peninsula, Central Japan (Figs. 1 and 2). Fukutomi (1935, 1938) discovered emerged sessile assemblages on Shikinejima and Jinaijima within the Izu Islands and in southern Izu Peninsula, Central Japan Ota et al (1983, 1986) determined the 14C ages of emerged assemblages from the southern coast of Izu Peninsula and Shikinejima (Fig. 2; Table 1), and demonstrated that the ages obtained were inconsistent with the hypotheses of Fukutomi (1935, 1938), Hatori (1975), and Aida (1981). The present study examines Holocene crustal movements on the islands of Shikinejima, Niijima, and Kitamura et al Progress in Earth and Planetary Science (2017) 4:30 a 34°N
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