کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6445588 | 1640843 | 2014 | 20 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Vertical tectonic crustal movements along the Japanese coastlines inferred from late Quaternary and recent relative sea-level changes
ترجمه فارسی عنوان
حرکات زمین تکتونیک عمودی در امتداد سواحل ژاپن از تغییرات سطح دریا در اواخر کواترنری و اخیر به دست آمده است
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
زمین شناسی
چکیده انگلیسی
Observed relative sea-level (RSL) changes during the past â¼130Â kyr make it possible to evaluate the vertical crustal movement due to several tectonic processes such as the subduction of oceanic plates. Here we infer average rates of tectonic crustal movement along the Japanese coastlines on three typical timescales of â¼50Â yr, â¼6Â kyr and â¼125Â kyr based on tide gauge and Holocene RSL observations and the altitudes of marine terraces formed at the Last Interglacial (LIG) phase at â¼125Â ka. The rates on a timescale of â¼50Â yr are derived from tide gauge data, thermosteric sea-level changes due to thermal expansion of the oceans and predictions due to the glacio-hydro isostatic adjustment (GIA) for the last deglaciation and also recent melting of the mountain glaciers and Greenland and Antarctic ice sheets. Those for â¼6Â kyr and â¼125Â kyr are based on the RSL observations and the predictions by GIA modelling, considering uncertainties for temporal changes in eustatic sea-level for the mid- to late-Holocene and LIG phase. The inferred rates for â¼50Â yr are significantly different from those for â¼125Â kyr in most sites, particularly for sites along the coastline from eastern Hokkaido to northeastern Japan, Shikoku and south Kyushu facing the Pacific Ocean. In these regions, the rates for â¼125Â kyr and â¼50Â yr are positive (uplift) and negative (subsidence), respectively. Also, the observed RSL changes at â¼6Â ka are consistent with the inferred RSL changes using the rates for â¼125Â kyr and GIA-predictions in many sites, but inconsistent with those for â¼50Â yr in most sites except for a few sites. These results suggest that the rates on a timescale of â¼50Â yr are not representative of the tectonic crustal movements for timescales longer than â¼6Â kyr in most sites along the Japanese coastlines. However, the inferred rates on these timescales may be useful in discussing the recurrence of megathrust earthquake with its interval of â¼1Â kyr such as the 2011 earthquake off the Pacific coast of Tohoku.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Quaternary Science Reviews - Volume 91, 1 May 2014, Pages 42-61
Journal: Quaternary Science Reviews - Volume 91, 1 May 2014, Pages 42-61
نویسندگان
Jun'ichi Okuno, Masao Nakada, Masayoshi Ishii, Hideki Miura,