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Article

Evidence of Unknown Paleo-Tsunami Events along the Alas Strait, West Sumbawa, Indonesia

1
Coastal and Watershed Research Group, Faculty of Geography, Universitas Gadjah Mada, Yogyakarta 55281, Indonesia
2
Laboratoire de Géographie Physique, Université Paris 1 Panthéon Sorbonne, 75231 Paris, France
3
Faculté de Géographie et d’Aménagement, Université de Strasbourg, 67000 Strasbourg, France
4
Department of Maritime Sciences, Graduate School of Maritime Sciences, Kobe University, Kobe, Hyogo 657-8501, Japan
5
Directorate General of Water Resources, Ministry of Public Works and Housing, Jakarta 12110, Indonesia
6
Institut de Physique du Globe de Paris UMR 7154, Université Sorbonne Paris Cité, 75005 Paris, France
7
Faculty of Agriculture, Universitas Gadjah Mada, Yogyakarta 55281, Indonesia
*
Authors to whom correspondence should be addressed.
Geosciences 2021, 11(2), 46; https://doi.org/10.3390/geosciences11020046
Received: 23 October 2020 / Revised: 19 January 2021 / Accepted: 20 January 2021 / Published: 23 January 2021
(This article belongs to the Special Issue Interdisciplinary Geosciences Perspectives of Tsunami Volume 3)
Indonesia is exposed to earthquakes, volcanic activities, and associated tsunamis. This is particularly the case for Lombok and Sumbawa Islands in West Nusa Tenggara, where evidence of tsunamis is frequently observed in its coastal sedimentary record. If the 1815 CE Tambora eruption on Sumbawa Island generated a tsunami with well-identified traces on the surrounding islands, little is known about the consequences of the 1257 CE tremendous eruption of Samalas on the neighboring islands, and especially about the possible tsunamis generated in reason of a paucity of research on coastal sedimentary records in this area. However, on Lombok Island, the eruption of the Samalas volcano produced significant volumes of pyroclastic flows that entered the sea in the North and East of the island. These phenomena must have produced a tsunami that left their traces, especially on Sumbawa Island, whose western coastline is only 14 km away from Lombok’s eastern shore. Therefore, the main goal of this study is to investigate, find evidence, and determine the age of marine-origin sediments along the shore of the Alas Strait, Indonesia. We collected and analyzed samples of coral and seashells from marine deposits identified along the west coast of Sumbawa, i.e., in Belang Island and abandoned fishponds in Kiantar Village, in order to identify the sources and the occurrence period of these deposits events. Based on the radiocarbon dating of coral and seashell samples, we concluded that none of the identified marine deposits along the western coast of Sumbawa could be related chronologically to the 1257 CE eruption of Samalas. However, possible tsunami deposits located in Belang Island and abandoned fishponds in Kiantar Village yielded 4th century CE, 9th century CE, and 17th century CE. We also conclude that past large earthquakes triggered these tsunamis since no known volcanic eruption occurred near the Alas Strait at that time that may have triggered a tsunami. View Full-Text
Keywords: paleo-tsunami; grain size; radiocarbon dating; wave direction; Lombok; Sumbawa; Indonesia paleo-tsunami; grain size; radiocarbon dating; wave direction; Lombok; Sumbawa; Indonesia
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MDPI and ACS Style

Mutaqin, B.W.; Lavigne, F.; Wassmer, P.; Trautmann, M.; Joyontono, P.; Gomez, C.; Septiangga, B.; Komorowski, J.-C.; Sartohadi, J.; Hadmoko, D.S. Evidence of Unknown Paleo-Tsunami Events along the Alas Strait, West Sumbawa, Indonesia. Geosciences 2021, 11, 46. https://doi.org/10.3390/geosciences11020046

AMA Style

Mutaqin BW, Lavigne F, Wassmer P, Trautmann M, Joyontono P, Gomez C, Septiangga B, Komorowski J-C, Sartohadi J, Hadmoko DS. Evidence of Unknown Paleo-Tsunami Events along the Alas Strait, West Sumbawa, Indonesia. Geosciences. 2021; 11(2):46. https://doi.org/10.3390/geosciences11020046

Chicago/Turabian Style

Mutaqin, Bachtiar W., Franck Lavigne, Patrick Wassmer, Martine Trautmann, Puncak Joyontono, Christopher Gomez, Bagus Septiangga, Jean-Christophe Komorowski, Junun Sartohadi, and Danang S. Hadmoko 2021. "Evidence of Unknown Paleo-Tsunami Events along the Alas Strait, West Sumbawa, Indonesia" Geosciences 11, no. 2: 46. https://doi.org/10.3390/geosciences11020046

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