智利柴胡因沼泽(40°S/73.5°W)海啸沉积物的来源和分布

IF 0.9 4区 地球科学 Q3 GEOLOGY
Diego Aedo, Daniel Melnick, Ed Garrett, M. Pino
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引用次数: 2

摘要

在瓦尔迪维亚以南的Chaihuín沼泽(南纬39°56′/西经73°33′),1960年地震期间沉积了一层沙床。这项研究的目的是绘制1960年海啸沉积物的详细地图,并将早期的沙层与过去的海啸联系起来。利用111个岩心构造的地层剖面进行了野外填图,发现了3个砂层的存在。通过与现代沉积环境的沉积学和矿物学特征进行统计比较,确定了这些砂层的来源。结果表明,海啸可能将沼泽中发现的沙层运输了出去。据推测,这些砂层是由1575年、1737年或1837年和1960年历史上的大逆冲地震引起的下沉引起的海啸沉积在沼泽中的。然而,这三层在横向分布和震源方面彼此不同,我们将其解释为与人类活动相关的沙洲变化或同震滑动分布的差异导致同震沉降提供的可变容纳空间以及海啸波高。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Origen y distribución de depósitos de tsunami en la marisma de Chaihuín (40° S/73,5° O), Chile
At Chaihuín marsh, south of Valdivia (39°56’ S/73°33’ W), a sand bed was deposited during the 1960 earthquake. The aim of this study is to map the 1960 tsunami deposit in detail and to associate earlier sand layers with past tsunamis. Geologic field mapping by means of stratigraphic sections constructed using 111 cores in the marsh revealed the existence of three sand layers. The source of these sand layers was determined by a statistical comparison of their sedimentological and mineralogical signatures with modern depositional environments. The results show that tsunami waves probably transported the sand layers found in the marsh. It is inferred that these sand layers were deposited in the marsh by tsunamis that followed subsidence associated with the great historical megathrust earthquakes of 1575, 1737 or 1837, and 1960. However, the three layers are different from each other in terms of lateral distribution and source, which we interpret as either changes in the sand bar associated with human occupation or differences in coseismic slip distribution resulting in variable accommodation space provided by coseismic subsidence as well as in tsunami wave height.
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来源期刊
Andean Geology
Andean Geology 地学-地质学
CiteScore
3.90
自引率
0.00%
发文量
17
审稿时长
>12 weeks
期刊介绍: This journal publishes original and review articles on geology and related sciences, in Spanish or English, in three issues a year (January, May and September). Articles or notes on major topics of broad interest in Earth Sciences dealing with the geology of South and Central America and Antarctica, and particularly of the Andes, are welcomed. The journal is interested in publishing thematic sets of papers and accepts articles dealing with systematic Paleontology only if their main focus is the chronostratigraphical, paleoecological and/or paleogeographical importance of the taxa described therein.
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