Çanakkale-Ayvacik Deprem Firtinasinin (14 Ocak-20 Mart 2017) Si̇smi̇k Kaynaklari

Sözbi̇li̇r, Hasan; Uzel, Bora; Sümer, Ökmen; Eski, Semih; Softa, Mustafa; Tepe, Çiǧdem; Özkaymak, Çağlar; Baba, Alper

doi:10.20290/aubtdb.498805

Cited by 11 publications

(7 citation statements)

References 33 publications

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“…With the release of the stress accumulated in the region for 12 years (Sözbilir et al, 2017) before the basement earthquake, a stress discharge occurred in the region. The fact that b value was relatively low in this region before the earthquake also explains the stress accumulation in this region.…”

Section: Resultsmentioning

confidence: 99%

Analysis of the b-Values Before the July 21 th, 2017 Mw 6.6 Bodrum-Kos, Turkey Earthquake

Akar

2021

Erzincan Üniversitesi Fen Bilimleri Enstitüsü Dergisi

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In this study, a statistical analysis of regional and time-dependent changes of earthquake activity in Bodrum and its vicinity before the Bodrum-Kos earthquake (Mw 6.6) that occurred on 21 July 2017 was performed and the Gutenberg-Richter b-value change was investigated. The earthquake catalog used in the calculations was taken from Boğaziçi University, Kandilli Observatory and Earthquake Research Institute. This catalog contains 16947 earthquakes with M>2 between 2004 and the time until the Bodrum-Kos earthquake of 21.07.2017. The completeness magnitude for these earthquakes was calculated as 2.6. The b-value was calculated as 0.97 using the maximum probability method. Considering that tectonic earthquakes have bvalues between 0.5-1, it is seen that the b-value obtained by Gutenberg-Richter law for the vicinity of Bodrum in this study is a good fit. In addition, it was observed that b-value took high values in the north of Bodrum before the Bodrum-Kos earthquake occurred. Low values are observed in the southeast of Bodrum. Stress accumulation was correlated with b-values for the region.

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Section: Resultsmentioning

confidence: 99%

Analysis of the b-Values Before the July 21 th, 2017 Mw 6.6 Bodrum-Kos, Turkey Earthquake

Akar

2021

Erzincan Üniversitesi Fen Bilimleri Enstitüsü Dergisi

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“…The central branch follows the path southeast of Lake Sapanca and runs south of Geyve, Pamukova and Lake Iznik extending along the south coast of the Marmara Sea (Kocyigit, 1988;Barka, 1997;Kurcer et al, 2008) and the south branch separates from the central branch near Pamukova and extends in SW-NE direction via Yenisehir, Bursa, Ulubat, Gonen, and Yenice to the Edremit Gulf (Herece, 1990;Yaltirak, 2002;Bekler and Demirci, 2018). The recurrence intervals of earthquakes in the Marmara region affected by the north branch of the NAFZ have short time intervals of 150-300 years, while the central branch is currently a seismic gap and the south branch has a longer earthquake recurrence interval compared to the north branch (Ikeda et al, 1991;Rockwell et al, 2001;Hartleb et al, 2006;Sozbilir et al, 2018). Radiocarbon dates for the earthquakes recorded in trench studies on Yenice-Gonen fault that is considered to be a part of the southern branch of the NAFZ show that the recurrence interval of the earthquakes was calculated as 660±160 years (Kurcer et al, 2008).…”

Section: Active Tectonics and Seismicitymentioning

confidence: 99%

“…The right-lateral strike-slip faults representing the south branch of the NAFZ combined with the West Anatolian extensional regime shaped the active Tuzla, Babakale, Gulpinar, Camkoy and Kestanbol faults (Karacik and Yilmaz, 1998;Emre et al, 2012;Ozden et al, 2018;Sozbilir et al, 2018). These faults play an important role in the distribution of geothermal springs and the development of their hydrogeochemical characterization.…”

Section: Active Tectonics and Seismicitymentioning

confidence: 99%

“…A total of 1470 buildings were extensively damaged in Ayvacik (Livaoglu et al, 2018). Sozbilir et al (2018) suggested that the Tuzla fault can produce the energy of a 6.7 Mw earthquake. From July 2018 to June 2019, 20 earthquakes with Mw 3.5 and above occurred in the close surroundings of the Kestanbol geothermal field (Table 2, Figure 4).…”

Section: Active Tectonics and Seismicitymentioning

confidence: 99%

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Hydrogeochemical and isotopic monitoring of the Kestanbol geothermal field (Northwestern Turkey) and its relationship with seismic activity

Yücel¹,

Özden²,

MARMARA³

2021

Turkish J Earth Sci

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Kestanbol geothermal field is located in northwestern Turkey and is one of the highest temperature geothermal fields in the Biga Peninsula. In this study, one geothermal well, two geothermal springs and two cold springs were monitored for one year in Kestanbol geothermal field to determine hydrogeochemical and isotopic characteristics. Additionally, any possible relationship between seismic activity and variations in the hydrochemistry of geothermal water was investigated. The Kestanbol geothermal field is controlled mainly by the right-lateral strike-slip Kaplica fault with normal components. The distribution of the geothermal waters is roughly parallel to the fault. The temperature, electrical conductivity, salinity, and pH of the geothermal waters were within the range of 59.5 to 74.6 °C, 30300 to 35700 μS/cm, 19.6 to 23.3‰ and 6.13 to 6.83, respectively. The temperature interval was 11.2 to 25.4 °C for cold waters. The hydrochemical facies of the geothermal waters were Na-Cl type and the cold waters were the Ca-HCO 3 -Cl type. The high concentrations of As, Ba, Fe, Li and Mn in geothermal waters were mainly derived from prolonged water-rock interactions under high-temperature conditions. The δ 18 O and δ 2 H contents of cold waters indicated meteoric origin. The geothermal waters were enriched in δ 18 O and δ 2 H, and located on the mixing line between local groundwater and fossil seawater, indicating mixing processes. During our study period, 20 earthquakes with Mw 3.5 and above were recorded in the close surroundings of the Kestanbol geothermal field, and temporal variations in the physicochemical and chemical compositions of geothermal waters were observed. Concentrations Clof the geothermal waters exhibited decrease after the Tartisik-Ayvacik earthquake (Mw= 5.0), indicating more supplement of groundwater with shallow origin under the increase of tectonic stress.

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“…Source mechanism solutions for earthquakes with magnitude M≥4.0 show normal faulting with NW-SE strike in accordance with the characteristics of known active faults (Table 1 and Figure 2). A report prepared by Sözbilir et al (2017) after the Ayvacık earthquakes observed parallel fault planes extending in N-S orientation especially in the Tuzla geothermal field. Faults dipping SW were observed that may be possible branches of the Tuzla fault or independent faults with similar character.…”

Section: Ayvacık Earthquakes and Temporary Seismic Networkmentioning

confidence: 99%

Preliminary Observations and Assessment of Çanakkale-Ayvacık Earthquake Activity

Bekler

Demirci

2018

Çanakkale Onsekiz Mart Üniversitesi Fen Bilimleri Enstitüsü Dergisi

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A project was begun to monitor earthquake activity at the southwest branch of the Biga Peninsula in Ayvacık and close surroundings beginning on 14 January 2017 with Mw=4.6 and continuing through 6 February 2017 with Mw=5.5 (Mw=5.5 Kandilli Observatory and Earthquake Research Institute -KOERI -, Mw=5.3 AFAD, Mw=5.4 ÇOMÜ). The region has active seismicity and includes portions of the significant tectonic elements of the northwest Aegean region. Due to the continuation of earthquake activity, in addition to permanent stations linked to the national networks (KOERI and AFAD) in the region 10 continuousform recording 3-component temporary stations were set up with the aim of observation for at least 1 year. The distances between these stations varied from 6 to 12 km. In addition to the intensity and continuity of microearthquake activity in the region, and the inclusion of geothermal fields in the region, the necessity to investigate the seismotectonic character of the region in detail came to the agenda. Together with permanent stations belonging to national observatories in the study area, the station density was insufficient to reveal these details. As a result, data from both national network and temporary stations will contribute to understanding the tectonic character of the region. When temporary stations at close proximity to the main shock and epicenter distribution are compared with the national network primary results indicate there were significant improvements in identifying microearthquakes especially and in determining their locations. Additionally, and in source mechanism solutions belonging to earthquake data with moderate magnitude, faulting with a dominantly NW-SE oriented normal offset component was observed. This study aims to reveal the time and spatial distribution, frequency content and source mechanisms for earthquakes occurring in the southwest of the Biga Peninsula near Ayvacık and surroundings, in addition to determining a detailed velocity model with local tomography.

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Çanakkale-Ayvacik Deprem Firtinasinin (14 Ocak-20 Mart 2017) Si̇smi̇k Kaynaklari

Cited by 11 publications

References 33 publications

Analysis of the b-Values Before the July 21 th, 2017 Mw 6.6 Bodrum-Kos, Turkey Earthquake

Analysis of the b-Values Before the July 21 th, 2017 Mw 6.6 Bodrum-Kos, Turkey Earthquake

Hydrogeochemical and isotopic monitoring of the Kestanbol geothermal field (Northwestern Turkey) and its relationship with seismic activity

Preliminary Observations and Assessment of Çanakkale-Ayvacık Earthquake Activity

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