Sedimentary Traces of Tsunamis in the Aegean Sea During the Last 1500 Years

Yıl 2019, , 199 - 220, 31.08.2019

Ulaş Avşar

https://doi.org/10.25288/tjb.545990

Öz

As high energy tsunami waves reach shallow near-shore environments, the height of the waves increases and sea water propagates towards the land. During this movement, significant amounts of sediment are transported inland from the nearshore, foreshore and beach. While a lagoon that is separated from the sea by a low, thin sand barrier has a relatively calm depositional environment under normal conditions, during a tsunami the sea water climbs over the sand barrier and deposits material from the nearshore, foreshore and sand barrier onto inner parts of the lagoon. This phenomenon is the reason why investigation of sedimentary sequences in lagoons reveals the sedimentary traces of past tsunamis. In this study, the physical and geochemical properties of sediments in two ca. 3.2 m-long cores collected from Karine Lagoon on the coast of Aydın-Söke (western Turkey) were investigated in order to determine the traces of past tsunamis in the Aegean Sea. An ITRAX micro-XRF scanner was used to obtain 0.2 mm-resolution radiographic images and 1mm-resolution XRF data from the cores. High-resolution analysis detected three heterogeneous and high-density intercalations within the relatively homogenous and occasionally laminated background sediments. XRF data revealed that these intercalations had significantly higher Ca/Ti values compared to the background sediments, i.e. they were rich in carbonates. Observation under a stereo-microscope determined that while the background sediments contained fresh bivalve shells smaller than 1 cm in diameter, the intercalations contained weathered/broken bivalve shells approximately 4 cm in diameter. Considering the physical and geochemical observations together, it was concluded that the intercalations containing relatively coarser and intensely-weathered bivalve shells are deposits that were transported from the sand barrier of the lagoon during tsunamis. Radiocarbon dating shows that three intercalations in the sequence of Karine Lagoon were deposited during the tsunamis, from AD 1956, 1650 and 1303.

Anahtar Kelimeler

Karine Lagoon, core radiography, ITRAX micro-XRF scanner, radiocarbon, paleotsunami

Son 1500 Yıl Boyunca Ege Denizi’ndeki Tsunamilerin Sedimanter İzleri

Öz

Yüksek enerjili tsunami dalgaları kıyıya yakın sığ bölgelere yaklaştıkça dalga yüksekliği artarak, deniz suyu karasal alanlara doğru tırmanır/ilerler, ve bu ilerleme sırasında yakın kıyı, kıyı önü ve kumsaldan ciddi miktarda sediman karaya doğru taşınır. Normal koşullar altında, alçak ve ince bir kum bariyeri ile denizden ayrılan bir lagün görece sakin bir çökelim ortamına sahipken, tsunami sırasında deniz suyu kum bariyerini aşarak lagünün iç kısımlarına yakın kıyı, kıyı önü ve kum bariyere ait sedimanları taşır. Bu nedenle, lagünlerdeki sedimanter istiflerin araştırılması, geçmişte meydana gelmiş tsunamilerin sedimanter izlerinin bulunmasında önemli rol oynar. Bu çalışmada, Karine Lagünü’nden alınan yaklaşık 3,2 m uzunluktaki iki adet karot boyunca sedimanların fiziksel ve jeokimyasal özellikleri incelenmiş, ve Ege Denizi’nde geçmişte meydana gelmiş tsunamilerin izleri araştırılmıştır. ITRAX mikro-XRF karot tarayıcısı kullanılarak, karotlar boyunca 0,2 mm çözünürlükte radyografik görüntüleme ve 1 mm çözünürlükte XRF taraması yapılmıştır. Yapılan bu yüksek çözünürlüklü analizler ışığında, görece homojen ve bazen ince tabakalanmalı istifin içinde, iki karotta da belirgin bir şekilde gözlenen, yüksek yoğunluğa sahip ve heterojen yapıda üç adet ara katman tespit edilmiştir. XRF verileri incelendiğinde, bu ara katmanlardaki Ca/Ti değerlerinin belirgin bir şekilde istifin geri kalanından daha yüksek olduğu, yani ara katmanların karbonatça zengin olduğu görülmüştür. Stereo mikroskop ile yapılan incelemelerde, istifin genelini temsil eden seviyelerde çökellerin genellikle 1 cm’den küçük bozuşmamış bivalv kavkıları içerdiği, buna karşın ara katmaların ise çapları yaklaşık 4 cm’yi bulan ve yüzeylerinde belirgin bozuşma izleri olan bivalv kavkıları içerdiği görülmüştür. Fiziksel ve jeokimyasal gözlemler birlikte değerlendirildiğinde, görece iri taneli ve bozuşmaya uğramış bivalv kavkıları içeren bu ara katmanların, tsunamiler sırasında lagünün kum bariyerinden taşınan tsunami çökelleri olduğu sonucuna varılmıştır. Radyokarbon tarihlendirmeleri, Karine Lagünü’ndeki üç adet ara katmanın M.S. 1956, 1650 ve 1303 yıllarındaki tsunamilerden kaynaklandığını göstermektedir.

Anahtar Kelimeler

Karine Lagünü, karot radyografisi, ITRAX mikro-XRF tarayıcı, radyokarbon, tsunami, paleotsunami

Teşekkür

Bu çalışma, Avrupa Komisyonu “Marie Sklodowska-Curie Actions – Individual Fellowships” programı tarafından desteklenen ve Orta Doğu Teknik Üniversitesi Jeoloji Mühendisliği Bölümü’nde yürütülmüş olan “Towards a paleotsunami chronology in the southern Aegean and Levantine seas, Eastern Mediterranean (EASTMED-PALEOTSUNAMI)” başlıklı proje kapsamında yapılmıştır. Yazar; Özgür Avşar (Muğla Sıtkı Koçman Üniversitesi), Bülent Tokay (Orta Doğu Teknik Üniversitesi), Emre Çetinkaya (Orta Doğu Teknik Üniversitesi), Emrah Ürün ve Sinan Altıok’a karot alma çalışmalarına yaptıkları katkılardan dolayı ve Zeynep Bektaş’a (Orta Doğu Teknik Üniversitesi) u-kanal çıkarma işlemleri sırasındaki yardımlarından dolayı teşekkür eder.

Kaynakça

• Alpar, B., Ünlü, S., Altınok, Y., Özer, N. ve Aksu, A., 2012. New approaches in assessment of tsunami deposits in Dalaman (SW Turkey). Natural Hazards, 63, 181-195.
• Avşar, U., 2019. Sedimentary geochemical evidence of historical tsunamis in the Eastern Mediterranean from Ölüdeniz Lagoon, SW Turkey. Journal of Paleolimnology, 61 (3), 373-385.
• Baranes, H.E., Woodruff, J.D., Wallace, D.J., Kanamaru, K. ve Cook, T.L., 2016. Sedimentological records of the C.E. 1707 Hoei Nankai Trough tsunami in the Bungo Channel, southwestern Japan. Natural Hazards, 84, 1185-1205.
• Bertrand, S., Doner, L., Akçer Ön, S., Sancar, U., Schudack, U., Mischke, S., Çağatay, M.N. ve Leroy, S.A.G., 2011. Sedimentary record of coseismic subsidence in Hersek coastal lagoon (Izmit Bay, Turkey) and the late Holocene activity of the North Anatolian Fault. Geochemistry Geophysics Geosystems, 12, 1-17.
• Bronk Ramsey, C., 2017. OxCal Program v. 4.3.2”. University of Oxford, Radiocarbon Accelerator Unit.
• Bruins, H.J., MacGillivray, J.A., Synolakis, C.E., Benjamini, C., Keller, J., Kisch, H.J., Klügel, A. ve van der Plicht, J., 2008. Geoarchaeological tsunami deposits at Palaikastro (Crete) and the Late Minoan IA eruption of Santorini. Journal of Archaeological Science, 35, 191-212.
• Chagué-Goff, C., 2010. Chemical signatures of palaeotsunamis: A forgotten proxy?. Marine Geology, 271, 67–71.
• Chagué-Goff, C., Schneider, J.L., Goff, J.R., Dominey-Howes, D. ve Strotz, L., 2011. Expanding the proxy toolkit to help identify past events - Lessons from the 2004 Indian Ocean Tsunami and the 2009 South Pacific Tsunami. Earth Science Reviews, 107, 107–122.
• Chagué-Goff, C., Szczuciński, W. ve Shinozaki, T., 2017. Applications of geochemistry in tsunami research: A review. Earth Science Reviews, 165, 203-244.
• Clark, K., Cochran, U. ve Mazengarb, C., 2011. Holocene coastal evolution and evidence for paleotsunami from a tectonically stable region, Tasmania, Australia. Holocene, 21, 883-895.
• Croudace, I.W. ve Rothwell, R.G., 2015. Twenty Years of XRF Core Scanning Marine Sediments: What Do Geochemical Proxies Tell Us?, I.W. Croudace ve R.G. Rothwell (Eds.). Micro-XRF Studies of Sediment Cores, Developments in Paleoenvironmental Research 17 (25-102), Springer, Dordrecht.
• Dominey-Howes, D.T.M., Papadopoulos, G.A. ve Dawson, A.G., 2000a. Geological and Historical Investigation of the 1650 Mt. Columbo Eruption and Tsunami, Aegean Sea, Greece. Natural Hazards, 21, 83–96.
• Dominey-Howes, D.T.M., Cundy, A. ve Croudace, I., 2000b. High energy marine flood deposits on Astypalaea Island, Greece: possible evidence for the AD 1956 southern Aegean tsunami. Marine Geology, 163, 303–315.
• Donato, S.V., Reinhardt, E.G., Boyce, J.I., Pilarczyk, J.E. ve Jupp, B.P., 2009. Particle-size distribution of inferred tsunami deposits in Sur Lagoon, Sultanate of Oman. Marine Geology, 257, 54–64.
• Dura, T., Cisternas, M., Horton, B.P., Ely, L.L., Nelson, A.R., Wesson, R.L. ve Pilarczyk, J.E., 2015. Coastal evidence for Holocene subduction-zone earthquakes and tsunamis in central Chile. Quaternary Science Reviews, 113, 93-111.
• Emre, Ö., Doğan, A. ve Özalp, S., 2011. 1:250.000 Ölçekli Türkiye Diri Fay Haritaları Serisi. Maden Tetkik ve Arama Genel Müdürlüğü, Ankara-Türkiye.
• Fischer, P., Finkler, C., Röbke, B.R., Baika, K., Hadler, H., Willershäuser, T., Rigakou, D., Metallinou, G. ve Vött, A., 2016. Impact of Holocene tsunamis detected in lagoonal environments on Corfu (Ionian Islands, Greece) - geomorphological, sedimentary and microfaunal evidence. Quaternary International, 401, 4-16.
• Galanopoulos, A.G., 1957. The seismic sea-wave of 9 Iouliou 1956. Praktika Academy Athens, 32 pp. 90–101 (in Greek with Engl. abstr.).
• Goodman-Tchernov, B.N., Dey, H.W., Reinhardt, E.G., McCoy, F. ve Mart, Y., 2009. Tsunami waves generated by the Santorini eruption reached Eastern Mediterranean shores. Geology, 37, 943-946.
• Goff, J., Lamarche, G., Pelletier, B., Chague-Goff, C. ve Strotz, L., 2011. Predecessors to the 2009 South Pacific tsunami in the Wallis and Futuna archipelago. Earth Science Reviews, 107, 91–106.
• Graehl, N.A., Kelsey, H.M., Witter, R.C., Hemphill-Haley, E. ve Engelhart, S.E., 2015. Stratigraphic and microfossil evidence for a 4500-year history of Cascadia subduction zone earthquakes and tsunamis at Yaquina River estuary, Oregon, USA. Geological Society of America Bulletin, 127, 211-226.
• Gutierrez-Mas, J.M., Lopez-Arroyo, J. ve Morales, J.A., 2009. Recent marine lithofacies in Cadiz Bay (SW Spain) Sequences, processes and control factors. Sedimentary Geology, 218, 31–47.
• ITIC, 2018. International Tsunami Information Center. http://itic.ioc-unesco.org
• Jackson, K.L., Eberli, G.P., Amelung, F., McFadden, M.A., Moore, A.L., Rankey, E.C. ve Jayasena, H.A.H., 2014. Holocene Indian Ocean tsunami history in Sri Lanka. Geology, 42, 859-862.
• Kelsey, H.M., Nelson, A.R., Hemphill-Haley, E. ve Witter, R.C., 2005. Tsunami history of an Oregon coastal lake reveals a 4600 yr record of great earthquakes on the Cascadia subduction zone. Geological Society of America Bulletin, 117, 1009-1032.
• Kempf, P., Moernaut, J., Van Daele, M., Vermassen, F., Vandoorne, W., Pino, M., Urrutia, R., Schmidt, S., Garrett, E. ve De Batist, M., 2015. The sedimentary record of the 1960 tsunami in two coastal lakes on Isla de Chiloé, south central Chile. Sedimentary Geology, 328, 73-86.
• Kempf, P., Moernaut, J., Van Daele, M., Vandoorne, W., Pino, M., Urrutia, R. ve De Batist, M., 2017. Coastal lake sediments reveal 5500 years of tsunami history in south central Chile. Quaternary Science Reviews, 161, 99-116.
• Kitamura, A., Fujiwara, O., Shinohara, K., Akaike, S., Masuda, T., Ogura, K., Urano, Y., Kobayashi, K., Tamaki, C. ve Mori, H., 2013. Identifying possible tsunami deposits on the Shizuoka Plain, Japan and their correlation with earthquake activity over the past 4000 years. Holocene, 23, 1684-1698.
• Mamo, B., Strotz, L. ve Dominey-Howes, D., 2009. Tsunami sediments and their foraminiferal assemblages. Earth Science Reviews, 96, 263-278.
• Mathes-Schmidt, M., Schwarzbauer, J., Papanikolaou, I., Syberberg, F., Thiele, A., Wittkopp, F. ve Reicherter, K., 2013. Geochemical and micropaleontological investigations of tsunamigenic layers along the Thracian Coast (Northern Aegean Sea, Greece). Zeitschrift für Geomorphologie, 57, 005-027.
• May, S.M., Vött, A., Brückner, H. ve Smedile, A. 2012a. The Gyra washover fan in the Lefkada Lagoon, NW Greece—possible evidence of the 365 AD Crete earthquake and tsunami. Earth, Planets and Space, 64, 859–874.
• May, S.M., Vött, A., Brückner, H., Grapmayer, R., Handl, M. ve Wennrich, V., 2012b. The Lefkada barrier and beachrock system (NW Greece) — Controls on coastal evolution and the significance of extreme wave events. Geomorphology, 139-140, 330-347.
• Minoura, K., Imamura, F., Kuran, U., Nakamura, T., Papadopoulos, G.A., Takahashi, T. ve Yalçıner, A.C., 2000. Discovery of Minoan tsunami deposits. Geology, 28, 59-62.
• Mischke, S., Schudack, U., Bertrand, S. ve Leroy, S.A.G., 2012. Ostracods from a Marmara Sea lagoon (Turkey) as tsunami indicators. Quaternary International, 261, 156-161.
• Nanayama, F., Furukawa, R., Kiyoyuki, S., Makino, A., Soeda, Y. ve Igarashi, Y., 2007. Nine unusually large tsunami deposits from the past 4000 years at Kiritappu marsh along the southern Kuril Trench. Sedimentary Geology, 200, 275-294.
• NCEI/WDS, 2019. Global Historical Tsunami Database. NOAA National Centers for Environmental Information. Doi: 10.7289/V5PN93H7 [Erişim tarihi: 19.01.2019]
• Papadopoulos, G.A. ve Imamura, F., 2001. A proposal for a new tsunami intensity scale. Proceedings of the International Tsunami Symposium 2001, Seattle, 569–577.
• Papadopoulos, G.A., Minoura, K., Imamura, F., Kuran, U., Yalçiner, A., Fokaefs, A. ve Takahashi, T., 2012. Geological evidence of tsunamis and earthquakes at the Eastern Hellenic Arc: correlation with historical seismicity in the eastern Mediterranean Sea. Research in Geophysics, 2, 90-99.
• Papadopoulos, G.A., Gràcia, E., Urgeles, R., Sallares, V., De Martini, P.M., Pantosti, D., González, M., Yalciner, A.C., Mascle, J., Sakellariou, D., Salamon, A., Tinti, S., Karastathis, V., Fokaefs, A., Camerlenghi, A., Novikova, T. ve Papageorgiou, A., 2014. Historical and pre-historical tsunamis in the Mediterranean and its connected seas: Geological signatures, generation mechanisms and coastal impacts. Marine Geology, 354, 81–109.
• Peterson, C.D., Carver, G.A., Cruikshank, K.M., Abramson, H.F., Garrison-Laney, C.E. ve Dengler, L.A., 2011. Evaluation of the use of paleotsunami deposits to reconstruct inundation distance and runup heights associated with prehistoric inundation events, Crescent City, southern Cascadia margin. Earth Surface Processes and Landforms, 36, 967–980.
• Pilarczyk, J.E. ve Reinhardt, E.G., 2012. Testing foraminiferal taphonomy as a tsunami indicator in a shallow arid system lagoon: Sur, Sultanate of Oman. Marine Geology, 295-298, 128-136.
• Pirazzoli, P.A., Ausseil-Badie, J., Giresse, P., Hadjidakit, E. ve Arnold, M., 1992. Historical environmental changes at Phalasarna harbour, West Crete. Geoarchaeology, 7, 371-392.
• Ramírez-Herrera, M.T., Lagos, M., Hutchinson, I., Kostoglodov, V., Machain, M.L., Caballero, M., Goguitchaichvili, A., Aguilar, B., Chagué-Goff, C., Goff, J., Ruiz-Fernández, A.C., Ortiz, M., Nava, H., Bautista, F., Lopez, G.I. ve Quintana, P., 2012. Extreme wave deposits on the Pacific coast of Mexico: Tsunamis or storms? — A multi-proxy approach. Geomorphology, 139–140, 360-371.
• Razjigaeva, N.G., Ganzey, L.A., Grebennikova, T.A., Ivanova, E.D., Kharlamov, A.A., Kaistrenko, V.M., Arslanov, Kh.A. ve Chernov, S.B., 2014. The Tohoku Tsunami of 11 March 2011: The Key Event to Understanding Tsunami Sedimentation on the Coasts of Closed Bays of the Lesser Kuril Islands. Pure and Applied Geophysics, 171, 3307–3328.
• Reimer, P.J., vd., 2013. IntCal13 and Marine13 Radiocarbon Age Calibration Curves, 0-50,000 years cal BP. Radiocarbon, 55 (4), 1869-1887.
• Röbke, B.R. ve Vött, A., 2017. The tsunami phenomenon. Progress in Oceanography, 159, 296-322.
• Ruiz, F., Abad, M., Cáceres, L.M., Vidal, J.R., Carretero, M.I., Pozo, M. ve González-Regalado, M.L., 2010. Ostracods as tsunami tracers in Holocene sequences. Quaternary Research, 73, 130-135.
• Sakellariou, D. ve Tsampouraki-Kraounaki, K., 2019. Plio-Quaternary Extension and Strike-Slip Tectonics in the Aegean. Duarte, J.C. (ed.), Transform Plate Boundaries and Fracture Zones. Elsevier. 478 s.
• Sawai, Y., Kamataki, T., Shishikura, M., Nasu, H., Okamura, Y., Satake, K., Thomson, K.H., Matsumoto, D., Fujii, Y., Komatsubara, J. ve Aung, T.T., 2009. Aperiodic recurrence of geologically recorded tsunamis during the past 5500 years in eastern Hokkaido, Japan. Journal of Geophysical Research, 114, B01319.
• Scheffers, A. ve Scheffers, S., 2007. Tsunami deposits on the coastline of west Crete (Greece). Earth and Planetary Science Letters, 259, 613-624.
• Smedile, A., De Martini, P.M., Pantosti, D., Bellucci, L., Del Carlo, P., Gasperini, L., Pirrotta, C., Polonia, A. ve Boschi, E., 2011. Possible tsunami signatures from an integrated study in the Augusta Bay offshore (Eastern Sicily-Italy). Marine Geology, 281, 1–13.
• Stuiver, M. ve Polach, H. A., 1977. Discussion: Reporting of 14C data. Radiocarbon, 19, 355-363.
• Tjallingii, R., Röhl, U., Kölling, M. ve Bickert, T., 2007. Influence of the water content on X-ray fluorescence core-scanning measurements in soft marine sediments. Geochemistry Geophysics Geosystems, 8, 1-12.
• Tyuleneva, N., Braun, Y., Katz, T., Suchkov, I. ve Goodman-Tchernov, B., 2018. A new chalcolithic-era tsunami event identified in the offshore sedimentary record of Jisr al-Zarka (Israel). Marine Geology, 396, 67-78.
• van den Bergh, G.D., Boer, W., de Haas, H., van Weering, Tj.C.E. ve van Wijhe, R., 2003. Shallow marine tsunami deposits in Teluk Banten (NW Java, Indonesia), generated by the 1883 Krakatau eruption. Marine Geology, 197, 13-34.
• Vött, A., Brüeckner, H., Brockmüeller, S., Handl, M., May, S.M., Gaki-Papanastassiou, K., Herd, R., Lang, F., Maroukian, H., Nelle, O. ve Papanastassiou, D., 2009. Traces of Holocene tsunamis across the Sound of Lefkada, NW Greece. Global and Planetary Change, 66, 112–128.
• Vött, A., Lang, F., Brüeckner, H., Gaki-Papanastassiou, K., Maroukian, H., Papanastassiou, D., Giannikos, A., Hadler, H., Handl, M., Ntageretzis, K., Willershaeuser, T. ve Zander, A., 2011. Sedimentological and geoarchaeological evidence of multiple tsunamigenic imprint on the Bay of Palairos-Pogonia (Akarnania, NW Greece). Quaternary International, 242, 213-239.
• Vött, A., Bruins, H.J., Gawehn, M., Goodman-Tchernov, B.N., De Martini, P.M., Kelletat, D., Mastronuzzi, G., Reicherter, K., Röbke, B.R., Scheffers, A., Willershauser, T., Avramidis, P., Bellanova, P., Costa, P.J.M., Finkler, C., Hadler, H., Koster, B., Lario, J., Reinhardt, E., Mathes-Schmidt, M., Ntageretzis, K., Pantosti, D., Papanikolaou, I., Sanso, P., Scicchitano, G., Smedile, A., Szczucinski, W., 2018. Publicity waves based on manipulated geoscientific data suggesting climatic trigger for majority of tsunami findings in the Mediterranean—response to ‘Tsunamis in the geological record: making waves with a cautionary tale from the Mediterranean’ by Marriner et al. (2017). Zeitschrift für Geomorphologie, (Supplementary Issues) 1:2, 39 s.
• Wagner, B., Bennike, O., Klug, M. ve Cremer, H., 2007. First indication of Storegga tsunami deposits from East Greenland. Journal of Quaternary Science, 22, 321-325.
• Werner, V., Baika, K., Fischer, P., Hadler, H., Obrocki, L., Willershäuser, T., Tzigounaki, A., Tsigkou, A., Reicherter, K., Papanikolaou, I., Emde, K. ve Vött, A., 2018. The sedimentary and geomorphological imprint of the AD 365 tsunami on the coasts of southwestern Crete (Greece) - Examples from Sougia and Palaiochora. Quaternary International, 473, 66-90.
• Werner, V., Baika, K., Tzigounaki, A., Reicherter, K., Papanikolaou, I., Emde, K., Fischer, P. ve Vött, A., 2019. Mid-Holocene tectonic geomorphology of northern Crete deduced from a coastal sedimentary archive near Rethymnon and a Late Bronze Age Santorini tsunamite candidate. Geomorphology, 326, 167-189.