Identification of suspected paleotsunami deposits study from Karapyak Beach, Pangandaran area, West Jawa, Indonesia

A. Aswan, Y. Rizal
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Abstract

Identifying and constraining palaeotsunami deposits can be a vital tool for establishing the periodicity of earthquakes and their associated tsunami events beyond the historical records. However, the deposits can be difficult to establish and date. In this study we used the characteristics of the 2006 Pangandaran tsunami deposit as a reference for identification of paleotsunami deposits in Karapyak Beach, Pangandaran area, West Java, Indonesia. Similar to the 2006 Pangandaran tsunami deposit, the Karapyak Beach paleotsunami deposit is characterized by light brown loose sand materials overlying a dark brown paleosoil layer with erosional contact. A thin layer that varies in thickness is locally found right above the erosional contact, with non-laminated coarser grain in the lower part that gradually change into medium to fine sand-sized in upper part. The base of the lower part is rich with broken mollusc shells and corals, and the mid-top of the lower part may contain several intact molusc shells and corals, rock fragments and anthropogenic products (rooftile). Those types of fragments are absent in the upper part of the thin layer. Grain size analysis shows a mixture of fine and coarse grains in the lower part of 2006 tsunami deposits as well as in the suspected paleotsunami deposits, suggesting uprush high energy flow during sedimentation. Fining upward sequence above mixed grain layers reflects waning flow or pre-backwash deposition. Foraminifera analysis also shows a mixture of shallow and deep marine foraminifera in the two deposits. Based on the characteristics of the 2006 tsunami deposits, there are at least four identified paleotsunami deposits at Karapyak Beach, Pangandaran area.
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印度尼西亚西爪哇Pangandaran地区Karapyak海滩疑似古海啸沉积物的鉴定研究
识别和约束古海啸矿床可以成为确定历史记录之外的地震及其相关海啸事件周期性的重要工具。然而,矿床可能很难确定和确定日期。在本研究中,我们使用2006年Pangandaran海啸矿床的特征作为识别印度尼西亚西爪哇Pangandara地区Karapyak海滩古海啸矿床的参考。与2006年Pangandaran海啸矿床类似,卡拉皮亚克海滩古海啸矿床的特征是浅棕色松散沙物质覆盖在具有侵蚀接触的深棕色古土层上。在侵蚀接触的正上方局部发现厚度变化的薄层,下部为非层状粗颗粒,上部逐渐变为中等至细砂。下部的底部富含破碎的软体动物外壳和珊瑚,下部的中顶部可能包含几个完整的软体动物壳和珊瑚、岩石碎片和人为产物(屋顶瓦片)。这些类型的碎片在薄层的上部不存在。粒度分析显示,2006年海啸沉积物下部以及疑似古海啸沉积物中存在细颗粒和粗颗粒的混合物,表明沉积过程中存在高能流。混合颗粒层上方的向上序列变细反映了流量减弱或反冲洗前沉积。有孔虫分析还显示,在这两个矿床中,有浅海和深海有孔虫的混合物。根据2006年海啸矿床的特征,在Pangandaran地区的Karapyak海滩至少有四个已确定的古海啸矿床。
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审稿时长
16 weeks
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