A 2500 year paleoseismic record of the Húsavík-Flatey Fault inferred from the sediments of Botnsvatn Lake (North Iceland)

Date

2016-05-31

Author

Avşar, Ulaş
Geirsdttir, Aslaug
Thordarson, Thor

Metadata

Show full item record

Item Usage Stats

35
views

0
downloads

The Mid-Atlantic-Ridge formed by the divergent movement of the North American and Eurasian plates is offset towards east in Iceland, which results in a dextral transform zone just north of the island. The strain accommodated along this dextral transform zone is released mainly by the Húsavík-Flatey Fault (HFF) and Grímsey Oblique Rift (GOR) in magnitude 6-7 earthquakes. However, historical accounts of past major earthquakes are inaccurate and incomplete and primarily provide information for only the last 300 years. The GOR does not allow paleoseismological trenching since it is completely offshore, but a ~20 km-long southeastern part of the HFF is onshore. Still, the number of sites that are favorable for paleoseismic trenching is limited. We have therefore carried out lacustrine paleoseismological investigations in Botnsvatn Lake, which is located in a pull-apart basin of the HFF, that may provide crucial information about the past seismic activity of the HFF. We collected five sediment cores from the lake to investigate possible sedimentary traces of past earthquakes of the HFF. We detected a total of eleven earthquake-triggered ice-rafted debris deposits (IRD) during the last 1800 years of the Botnsvatn record, four of which are temporally correlated to the known historical earthquakes. On the other hand, the IRDs become highly frequent (40-50 years apart) during the period between 1800 BP and 2400 BP, which corresponds to significantly warmer climatic conditions compared to the rest of the record. Hence we believe that the oldest 600 years of the Botnsvatn record probably contains non-seismic origin IRDs, which prevents revealing paleoseismic information. According to the last 1800 years of the record, the recurrence interval of the earthquake-triggered IRDs is 140±35 years.

URI

https://hdl.handle.net/11511/75173

Conference Name

International Workshop on Earthquakes in North Iceland, (31 Mayıs - 03 Haziran 2016)

Collections

Department of Geological Engineering, Conference / Seminar

Suggestions

OpenMETU
Core

A new set of overprinting slip-data along Manisa Fault in Aegean Extensional Province, Western Anatolia Tekin, Taner; Sançar, Taylan; Rojay, Fuat Bora (2022-05-23) Interplay between the dynamic effects of the northward subduction of the African plate beneath the Aegean continental fragment and the North Anatolian dextral strike slip fault to the north caused a complex large-scale extensional crustal deformational domain, named Aegean extensional province.The Gediz-Alaşehir Graben (GAG), being in that large scale extensional terrain, is a NW-SE trending extensional basin developed to the north of K. Menderes Graben (KMG). NW-SE trending Manisa fault is one of the impor...
The Kapanbogazi formation: A key unit for understanding Late Cretaceous evolution of the Pontides, N Turkey TÜYSÜZ, OKAN; Melinte-Dobrinescu, Mihaela C.; Yılmaz, İsmail Ömer; Kirici, Sabri; Svabenicka, Lilian; Skupien, Peter (Elsevier BV, 2016-01-01) The Pontides forming the south-western continental margin of the Black Sea consist of two tectonic units, the Istanbul Zone in the west, and the Sakarya Zone in the central and eastern parts. The Sinop Basin in the Sakarya Zone is filled, from base to top, by Hauterivian to Albian turbidites, Cenomanian-Turonian red pelagic sediments, Turonian-Campanian magmatic-arc and related deposits, and by the uppermost Campanian to middle Eocene post-magmatic units developed on the southern passive margin of the Black...
New zircon U-Pb LA-ICP-MS ages and Hf isotope data from the Central Pontides (Turkey): Geological and geodynamic constraints ÇİMEN, OKAY; Göncüoğlu, Mehmet Cemal; Simonetti, Antonio; Sayıt, Kaan (2018-05-01) The Central Pontides in northern Anatolia is located on the accretionary complex formed by the closure of Neotethyan Intra-Pontide Ocean between the southern Eurasian margin (Istanbul-Zonguldak Terrane) and the Cimmerian Sakarya Composite Terrane. Among other components of the oceanic lithosphere, it comprises not yet well-dated felsic igneous rocks formed in arc-basin as well as continent margin settings. In-situ U-Pb age results for zircons from the arc-basin system (tiangaldag Metamorphic Complex) and th...
The NAF Experiment Uppermost Mantle Structure Beneath North Central Turkey Using Pn Tomography Gans, Christine R.; Biryol, C. Berk; Beck, Susan L.; Zandt, George; Özacar, Atilla Arda; Tok, Hande; Turkelli, Niyazi; TAYMAZ, TUNCAY (2008-12-15) The 1400km-long North Anatolian Fault (NAF), located in northern Turkey, forms a transform boundary between the Anatolian and Eurasian plates, and is capable of large destructive earthquakes. Located in part on an old suture zone, continental basement material is found north of the NAF, while accretionary complexes are found to the south. The North Anatolian Fault Passive Seismic Experiment (2005-2008), a joint project between the University of Arizona, the Middle East Technical University, Istanbul Technic...
An example of an accretionary fore-arc basın from Northern Central Anatolia and its implicaiıons for the history of subduction of neo-tethys in Turkey KOCYIGIT, A (1991-01-01) Deformed sedimentary sequences of Late Cretaceous-middle Eocene age located between the Sakarya continent and the Anatolian Complex have been interpreted as the fill of a forearc basin. The history and structure of this basin are critical for understanding the evolution of the Neo-Tethyan subduction in the Middle East. I test and elaborate upon this interpretation on the basis of three basic outcrop areas of Upper Cretaceous-lower Tertiary sedimentary sequences confined to a northeast-southwest-trending b...

Citation Formats

U. Avşar, A. Geirsdttir, and T. Thordarson, “A 2500 year paleoseismic record of the Húsavík-Flatey Fault inferred from the sediments of Botnsvatn Lake (North Iceland),” presented at the International Workshop on Earthquakes in North Iceland, (31 Mayıs - 03 Haziran 2016), Húsavík, North Iceland, 2016, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/75173.