Sedimentological evidence of washover deposits from extreme wave events in Zamboanga del Sur, Mindanao, southern Philippines
Sedimentological evidence of washover deposits from extreme wave events in Zamboanga del Sur, Mindanao, southern Philippines
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菲律宾南部棉兰老岛南三宝颜极端波浪事件冲刷沉积物的沉积学证据
DOI：
10.1016/j.margeo.2021.106535
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发表时间：
2021
期刊：
影响因子：
2.9
通讯作者：
Switzer Adam D.
中科院分区：
文献类型：
--
作者：
Claro Sheinna May D.;Ramos Noelynna T.;Fernando Allan Gil S.;Ishimura Daisuke;Switzer Adam D.
菲律宾活跃的构造环境和易受海啸危害的脆弱性突出表明，必须了解海啸的来源及其影响。过去，几次海啸引发的地震摧毁了沿海社区，但这些罕见的极端波浪事件（EWE）的地质证据尚未被详细描述和分析。本研究记录并建立了潜在的海啸沉积物保存在棉兰老岛西部的红树林环境中的证据，该环境被1976年摩罗湾海啸淹没。1976年的摩罗海湾海啸是菲律宾迄今为止最严重的海啸灾害，与哥打巴托俯冲带沿着发生的8. 1级地震有关。对菲律宾南部棉兰老岛南三宝颜市Pagadian湾和Illana湾交界的3个海岸带潜在海啸沉积物的沉积学特征进行了分析和比较，以描述不同海岸带系统中冲刷沉积物的保存情况。根据其沉积特征和与背景（海啸事件前）沉积物形成对比的特征，确定了1976年海啸的潜在冲刷沉积物。潜在的1976年海啸沉积物主要是沙大小的，比背景沉积物粗。它们还包含泥浆撕裂碎屑、磁铁矿薄层和侵蚀性基底，与其他地方报告的冲刷沉积物相似。冲刷沉积物的厚度范围为7 - 12厘米。在红树林沼泽中观察到最厚的砂层，这意味着当地地形影响了存款的分布和保存。在Pagadian市也观察到了一个可能更古老的母羊存款。红树林沼泽和沿海平原的背景沉积物都是泥到细砂。虽然缺乏历史数据和快速变化的环境条件下，在热带环境中研究冲刷沉积物的挑战，这项研究突出了必要的信息和教训，为未来的研究人员在菲律宾的冲刷沉积物。在棉兰老岛西部潜在的EWE冲刷沉积物的沉积学数据作为了解该地区的极端波事件的过程和机制的基本信息。这项研究进一步确立了该国历史上最严重的海啸，1976年摩罗海湾海啸，这有助于我们在热带环境中的海啸沉积物的知识的地质证据。
The Philippines' active tectonic setting and vulnerability to tsunami hazards underscore the necessity to understand tsunami sources and their impacts. Several tsunamigenic earthquakes have devastated coastal communities in the past but geological evidence of these infrequent extreme wave events (EWEs) have yet to be described and analyzed in detail. This study documents and establishes evidence of potential tsunami deposits preserved in a mangrove environment in western Mindanao Island, which was inundated by the 1976 Moro Gulf tsunami. The 1976 Moro Gulf tsunami, by far the worst tsunami disaster in the Philippines, is associated with a Mw 8.1 earthquake along the Cotabato subduction zone. The sedimentological characteristics of potential tsunami deposits in three coastal sites bordering Pagadian and Illana Bays in Zamboanga del Sur, Mindanao, southern Philippines were analyzed and compared to describe the preservation of washover deposits in different coastal systems. The potential washover deposits of the 1976 tsunami were identified based on their sedimentary characteristics and features that contrast with the background (pre-tsunami event) sediments. The potential 1976 tsunami deposits are predominantly sand-sized and coarser than the background sediments. They also contain mud rip-up clasts, magnetite lamina, and an erosive base, similar to reported washover deposits elsewhere. The thickness of the washover deposits ranges from 7 to 12 cm. The thickest sand layer was observed in a mangrove swamp, implying that local topography influenced the distribution and preservation of the deposit. A potentially older EWE deposit was also observed in Pagadian City. The background sediments in both the mangrove swamps and coastal plains are mud to fine sand. While scarcity in historical data and rapidly changing environmental conditions pose challenges in studying washover deposits in a tropical setting, this study highlights essential information and lessons for future researchers of washover deposits in the Philippines. Sedimentological data on the potential EWE washover deposits in western Mindanao Island serve as fundamental information in understanding the processes and mechanisms of extreme wave events in this region. This study further establishes geological evidence of the country's worst historical tsunami, the 1976 Moro Gulf tsunami, which contributes to our knowledge of tsunami deposits in tropical settings.
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DOI：
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