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Age determination of paleotsunami sediments around Lombok Island, Indonesia, and identification of their possible tsunamigenic earthquakes
Aswana, Zaim Y.a, Rizal Y.a, Sukanta I.N.b, Anugrah S.D.b, Hascaryo A.T.a, Gunawan I.b, Yatimantoro T.b, Wenizab, Hidayantib, Hawati P.b, Santoso W.D.a, Nurochima
a Geology Department, Institute of Technology Bandung (ITB), Bandung, 40132, Indonesia
b Tsunami Mitigation Division – Meteorological Climatological and Geophysical Agency (BMKG), Jakarta, 10720, Indonesia
[vc_row][vc_column][vc_row_inner][vc_column_inner][vc_separator css=”.vc_custom_1624529070653{padding-top: 30px !important;padding-bottom: 30px !important;}”][/vc_column_inner][/vc_row_inner][vc_row_inner layout=”boxed”][vc_column_inner width=”3/4″ css=”.vc_custom_1624695412187{border-right-width: 1px !important;border-right-color: #dddddd !important;border-right-style: solid !important;border-radius: 1px !important;}”][vc_empty_space][megatron_heading title=”Abstract” size=”size-sm” text_align=”text-left”][vc_column_text]© 2017, The Author(s).Age determination of paleotsunami sediment from Lombok Island, Indonesia, and surrounding area has been carried out using the 210Pb method in BATAN Jakarta. The basic theory of this method assumes that weathering of sediments, including paleotsunami sediments, will result in 210Pb enrichment. The principle of this method is to calculate 210Pb contents accumulation in a particular sedimentation interval from the surface to the deeper buried sediments. The results are then converted into age or depositional time in years ago unit. The dating results from the paleotsunami sediments of the Gawah Pudak (S8°46′2.91″, E115°56′34.23″) and Gili Trawangan areas (S8°21′1.38″, E116o2′36.6″) indicate the Gawah Pudak sediments were deposited 37 years ago (c. in 1977) and 22 years ago (c. in 1992). Three paleotsunami sediments from Gili Trawangan were deposited 149 years ago (c. in 1865), 117 years ago (c. in 1897) and 42 years ago (c. in 1972). These results are then compared to the available Indonesian earthquake catalogue data. This study reveals that paleotsunami sediments around Lombok Islands, from older to younger, were caused by the 1857 earthquake (epicentre in Bali Sea; M7; S8°00′09.45″, E115°29′56.41″), 1897 earthquake (epicentre in Flores Sea; M5.5; S6°47′59.62″, E120°48′03.5″ or Sulu Sea earthquake; M8.5; 70 km NW of Basilan Island), the 1975 earthquake (Nusa Tenggara; S10°6′16.61″, E123°48′09.39″), 1977 earthquake (in Waingapu, Sumba; M8.0; S11°5′39.34″, E118°27′50.86″) and the 1992 earthquake (Flores; M7.8; S8°28′52.11″, E121°53′44.3″).[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Author keywords” size=”size-sm” text_align=”text-left”][vc_column_text][/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Indexed keywords” size=”size-sm” text_align=”text-left”][vc_column_text]210Pb,Age,Earthquake,Paleotsunami,Sediment[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Funding details” size=”size-sm” text_align=”text-left”][vc_column_text][/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”DOI” size=”size-sm” text_align=”text-left”][vc_column_text]https://doi.org/10.1007/s11589-017-0179-2[/vc_column_text][/vc_column_inner][vc_column_inner width=”1/4″][vc_column_text]Widget Plumx[/vc_column_text][/vc_column_inner][/vc_row_inner][/vc_column][/vc_row][vc_row][vc_column][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][/vc_column][/vc_row]