TSUNAMI DEPOSIT STUDY IN KALIANDA REGION, SOUTH LAMPUNG, LAMPUNG PROVINCE
The 2018 volcanic activities of Anak Krakatau had generated a landslide and triggered a tsunami along the Kalianda Coastal Plain. The tsunami waves had deposited tsunamites along the Kalianda Coastal Plain, South Lampung, Lampung Province. Based on the tsunami event, the objective of this research i...
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| Format: | Final Project |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/54837 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | The 2018 volcanic activities of Anak Krakatau had generated a landslide and triggered a tsunami along the Kalianda Coastal Plain. The tsunami waves had deposited tsunamites along the Kalianda Coastal Plain, South Lampung, Lampung Province. Based on the tsunami event, the objective of this research is to determine characteristics of the deposits based on field analysis, microfaunal analysis, and granulometric analysis. Also, the long-term objective of this research is to assist research in paleostunami deposits and predicting tsunami periods. To achieve the objective of this research, 26 samples from 7 locations were gathered. The field analysis aimed to determine the megascopic characters of the Kalianda tsunami deposits. The granulometric analysis aimed to determine the grain size distributions of the Kalianda tsunami deposits. The microfaunal analysis aimed to determine the origin of the Kalianda tsunami deposits. The results of the field analysis showed that the Kalianda tsunami deposits generally characterized by light colors, grain sizes between fine sand-coarse sand, poorly sorted sediment, shell and coral fragments, and erosional contact. The granulometric analysis generally showed bimodal and multimodal distributions. The microfaunal analysis showed that the Kalianda tsunami deposits generally characterized by the mixing of marine microfossils from inner neritic and middle neritic. Based on micofaunal analysis, some of the foraminiferas that were founded within the sediment were in good condition and some were broken.
The results of the three analyses were also compared with tsunami deposits due to earthquakes and storm deposits. Compared with tsunami deposits in Aceh 2004 and Pangandaran 2006, all of them showed very similar characteristics. Different from storm deposits in general, the Kalianda tsunami deposits had thicknesses bellow 30 cm, few layers, none observed rip-up clast, and none observed associated features.
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