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首页> 外文期刊>Current Science: A Fortnightly Journal of Research >Luminescence studies on the sediments laid down by the December 2004 tsunami event: Prospects for the dating of palaeo tsunamis and for the estimation of sediment fluxes
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Luminescence studies on the sediments laid down by the December 2004 tsunami event: Prospects for the dating of palaeo tsunamis and for the estimation of sediment fluxes

机译：2004年12月海啸事件造成的沉积物的发光研究：古海啸的年代定年和沉积物通量的估计

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摘要

The tsunami of 26 December 2004 was associated with an Mw 9.3 earthquake. This was the second largest earthquake ever recorded. Geodynamic processes leading to such earthquakes suggest that these are repetitive. It is therefore desirable to obtain their recurrence interval. Earlier attempts to date palaeo-tsunami sediments have assumed that the basic premises for the use of optically stimulated luminescence (OSL) are adequately met. The sediments transported by the 2004 tsunami provided a maiden opportunity to verify the basic premises of the zeroing of the luminescence at the time of deposition. Results on eight of the nine samples using the conventional single aliquot regeneration (SAR) method provided OSL palaeodoses in the range 0.5 to 0.7 Gy. The recently developed component-specific SAR (CS-SAR) consistently provided OSL palaeodoses in the range 0.5-0.7 Gy. Further, CS-SAR consistently provided evidence that in eight of the nine samples, a fraction of the sample did experience daylight bleaching during transport with the tsunami. This was suggested by the fast-component OSL palaeodose of -0.2 Gy. This implies a maximum age offset of < 50 yrs and suggests that despite its energy and wave amplitude, only the top -20-50 cm layer of the sedimentin the intertidal zone was mobilized. This inference can be used for sediment influx calculations and hence for regional disaster management.
机译：2004年12月26日的海啸与9.3兆瓦级地震有关。这是有记录的第二大地震。导致此类地震的地球动力学过程表明，这些过程是重复性的。因此，期望获得它们的复发间隔。较早的对古海啸沉积物进行测年的尝试认为，已经充分满足了使用光激发发光（OSL）的基本前提。 2004年海啸运送的沉积物提供了首次机会，可在沉积时验证发光归零的基本前提。使用常规的单等分试样再生（SAR）方法对9个样品中的8个进行了分析，结果显示OSL palaeodoses的范围为0.5至0.7 Gy。最近开发的特定组件SAR（CS-SAR）始终提供0.5-0.7 Gy范围内的OSL古细菌。此外，CS-SAR持续提供证据表明，在9个样本中的8个中，有一部分样本在海啸运输过程中确实经历了日光漂白。 -0.2 Gy的快速成分OSL palaeodose暗示了这一点。这意味着最大的年龄偏移<50年，并表明尽管有能量和波幅，但仅动员了潮间带沉积物的顶部-20-50 cm层。此推论可用于沉积物涌入量计算，因此可用于区域灾害管理。

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