Variations in the 2004 Indian Ocean tsunami deposits thickness and their preservation potential, southwestern Thailand

Variations in the 2004 Indian Ocean tsunami deposits thickness and their preservation potential, southwestern Thailand
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2004年印度洋海啸沉积物厚度的变化及其保存潜力,泰国西南部

DOI:
10.5047/eps.2011.08.019
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发表时间:
2012
期刊:
Earth, Planets and Space
影响因子:
--
通讯作者:
S. Fujino
S. Fujino
中科院分区:
--
文献类型:
--
作者:
K. Goto;Jun Takahashi;S. Fujino

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2005年3月和2008年12月在泰国西南部进行了实地调查,以调查2004年12月26日印度洋海啸形成的陆上沉积物的厚度和保存潜力的地方差异。2008年的调查结果显示,由于局部地形波动和可能的生物扰动,在间距小于10米的凹坑中,沉积物的厚度变化了几厘米。在2005年和2008年调查的24个地点中,有13个地点的厚度差异在地区差异范围内。事实上,在2005年的调查中,只有1厘米厚的非常薄的海啸沉积物在2008年的调查中被完好地保存了下来。此外,在2008年的调查中发现了接近最大淹没极限的海啸沉积物,其厚度与2005年调查报告的厚度一致。没有一个地方的海啸沉积物被完全清除。根据这些观测结果,我们推断海啸沉积物的厚度保存得很好,即使在泰国这样的热带暴雨气候中也是如此。
Field surveys were conducted in March 2005 and December 2008 in southwestern Thailand to investigate local variation in the thickness and preservation potential of onshore deposits formed by the 26 December 2004 Indian Ocean tsunami. The 2008 survey results revealed that the thickness of deposits varies by a few centimeters in pits located less than 10 m apart because of local undulation of the topography and possible bioturbation. At 13 among all 24 sites, the difference in thickness during 2005 and 2008 surveys was within the range of local variation. In fact, very thin tsunami deposits with 1 cm thickness in the 2005 survey were well preserved during the 2008 survey. Furthermore, tsunami deposits near the maximum inundation limit were found in the 2008 survey, with thicknesses that are consistent with those reported from the 2005 survey. At no site was a tsunami deposit eliminated completely. Based on these observations, we infer that the tsunami deposit thickness is well preserved, even in a tropical climate with heavy rains such as that of Thailand.
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