Co-seismic beachrock deformation of 8th century AD Earthquake in Middle Strand of North Anatolian Fault, Lake Iznik, NW Turkey

Ahmet Evren Erginal; Ramazan Cüneyt Erenoğlu; Cengiz Yıldırım; H. Haluk Selim; Nafiye Güneç Kıyak; Oya Erenoğlu; Emin Ulugergerli; Mustafa Karabıyıkoğlu

doi:10.1016/j.tecto.2020.228690

Co-seismic beachrock deformation of 8th century AD Earthquake in Middle Strand of North Anatolian Fault, Lake Iznik, NW Turkey

Ahmet Evren Erginal^*, Ramazan Cüneyt Erenoğlu, Cengiz Yıldırım, H. Haluk Selim, Nafiye Güneç Kıyak, Oya Erenoğlu, Emin Ulugergerli, Mustafa Karabıyıkoğlu

^*Corresponding author for this work

Eurasia Institute of Earth Sciences

Research output: Contribution to journal › Article › peer-review

9 Citations (Scopus)

Abstract

A historical earthquake-related co-seismic deformation observed on beachrock beds along the southern shoreline of Lake Iznik is discussed as a new paleoseismic record for an 8th century AD earthquake in the Middle Strand of the North Anatolian Fault, NW Turkey. Electrical Resistivity Tomography (ERT) images beneath the beachrock surface allowed monitoring of the subsurface trace of a normal fault dipping north along a 100 m surface rupture. No strike-slip deformation exists along the rupture, suggesting that the deformation in the beachrock is connected with a secondary structure, and that the main surface rupture was under the lake waters. The deformed beds of the beachrock, dated using Optically Stimulated Luminescence (OSL) to 1.3 ± 0.15 ka, are overlain by an undeformed secondary deposition of beds dated to 1.2 ± 0.09 ka. This allows us to narrow down the time of the faulting and implying that it was most likely a result of the AD 715 earthquake.

Original language	English
Article number	228690
Journal	Tectonophysics
Volume	799
DOIs	https://doi.org/10.1016/j.tecto.2020.228690
Publication status	Published - 20 Jan 2021

Bibliographical note

Publisher Copyright:
© 2020 Elsevier B.V.

Funding

This research was supported by TUBITAK (project no: 109Y143 ) and the Scientific Research Projects Unit of Çanakkale Onsekiz Mart University (project no: SBA-2018-2772 ). AEE wishes to thank the Turkish Academy of Sciences (TUBA) for their support in the framework of the GEBİP program. Nurettin Yakupoğlu is thanked for his help in calculating the radiocarbon reservoir ages of beachrock samples. This paper is dedicated in fond memory of Professor Cengiz Akbulak, who completed his doctoral studies in the Lake Iznik basin and sadly passed away on Sunday July 21, 2019. This research was supported by TUBITAK (project no: 109Y143) and the Scientific Research Projects Unit of ?anakkale Onsekiz Mart University (project no: SBA-2018-2772). AEE wishes to thank the Turkish Academy of Sciences (TUBA) for their support in the framework of the GEB?P program. Nurettin Yakupo?lu is thanked for his help in calculating the radiocarbon reservoir ages of beachrock samples. This paper is dedicated in fond memory of Professor Cengiz Akbulak, who completed his doctoral studies in the Lake Iznik basin and sadly passed away on Sunday July 21, 2019.

Funders	Funder number
TUBA
TUBITAK	109Y143
Çanakkale Onsekiz Mart Üniversitesi	SBA-2018-2772
Türkiye Bilimler Akademisi

Keywords

AD 715
Beachrock
Lake Iznik
Middle Strand
North Anatolian Fault
Paleoseismology

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This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.tecto.2020.228690

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title = "Co-seismic beachrock deformation of 8th century AD Earthquake in Middle Strand of North Anatolian Fault, Lake Iznik, NW Turkey",

abstract = "A historical earthquake-related co-seismic deformation observed on beachrock beds along the southern shoreline of Lake Iznik is discussed as a new paleoseismic record for an 8th century AD earthquake in the Middle Strand of the North Anatolian Fault, NW Turkey. Electrical Resistivity Tomography (ERT) images beneath the beachrock surface allowed monitoring of the subsurface trace of a normal fault dipping north along a 100 m surface rupture. No strike-slip deformation exists along the rupture, suggesting that the deformation in the beachrock is connected with a secondary structure, and that the main surface rupture was under the lake waters. The deformed beds of the beachrock, dated using Optically Stimulated Luminescence (OSL) to 1.3 ± 0.15 ka, are overlain by an undeformed secondary deposition of beds dated to 1.2 ± 0.09 ka. This allows us to narrow down the time of the faulting and implying that it was most likely a result of the AD 715 earthquake.",

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doi = "10.1016/j.tecto.2020.228690",

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AU - Erginal, Ahmet Evren

AU - Erenoğlu, Ramazan Cüneyt

AU - Yıldırım, Cengiz

AU - Selim, H. Haluk

AU - Kıyak, Nafiye Güneç

AU - Erenoğlu, Oya

AU - Ulugergerli, Emin

AU - Karabıyıkoğlu, Mustafa

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N2 - A historical earthquake-related co-seismic deformation observed on beachrock beds along the southern shoreline of Lake Iznik is discussed as a new paleoseismic record for an 8th century AD earthquake in the Middle Strand of the North Anatolian Fault, NW Turkey. Electrical Resistivity Tomography (ERT) images beneath the beachrock surface allowed monitoring of the subsurface trace of a normal fault dipping north along a 100 m surface rupture. No strike-slip deformation exists along the rupture, suggesting that the deformation in the beachrock is connected with a secondary structure, and that the main surface rupture was under the lake waters. The deformed beds of the beachrock, dated using Optically Stimulated Luminescence (OSL) to 1.3 ± 0.15 ka, are overlain by an undeformed secondary deposition of beds dated to 1.2 ± 0.09 ka. This allows us to narrow down the time of the faulting and implying that it was most likely a result of the AD 715 earthquake.

AB - A historical earthquake-related co-seismic deformation observed on beachrock beds along the southern shoreline of Lake Iznik is discussed as a new paleoseismic record for an 8th century AD earthquake in the Middle Strand of the North Anatolian Fault, NW Turkey. Electrical Resistivity Tomography (ERT) images beneath the beachrock surface allowed monitoring of the subsurface trace of a normal fault dipping north along a 100 m surface rupture. No strike-slip deformation exists along the rupture, suggesting that the deformation in the beachrock is connected with a secondary structure, and that the main surface rupture was under the lake waters. The deformed beds of the beachrock, dated using Optically Stimulated Luminescence (OSL) to 1.3 ± 0.15 ka, are overlain by an undeformed secondary deposition of beds dated to 1.2 ± 0.09 ka. This allows us to narrow down the time of the faulting and implying that it was most likely a result of the AD 715 earthquake.

KW - AD 715

KW - Beachrock

KW - Lake Iznik

KW - Middle Strand

KW - North Anatolian Fault

KW - Paleoseismology

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M3 - Article

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ER -

Co-seismic beachrock deformation of 8th century AD Earthquake in Middle Strand of North Anatolian Fault, Lake Iznik, NW Turkey

Abstract

Bibliographical note

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Keywords

UN SDGs

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