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Paleoseismology of the 1966 Varto Earthquake (Ms 6.8) and Structure of the Varto Fault Zone, Eastern Turkey.

December 2014

Conference: AGU Fall Meeting

Authors:

Ankara University

The Ministry of Environment, Urbanization and Climate Change General Directorate of Spatial Planing

Ankara University

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An assessment of Holocene seismic activity on 1944 Earthquake Segment, North Anatolian Fault Zone (Turkey)

Article

Feb 2019

The 1944 earthquake segment of the North Anatolian Fault Zone contains paleoseismological signatures of major earthquake events. The segment consists of three active main faults and secondary faults showing anastomosing fault pattern. Stratigraphic and structural relationships and radiocarbon ages from trench excavation reveal that the main active fault located at the northernmost part of the region has produced four major earthquakes events up to now. These events, from north to south, correspond to 1944, 1668, 967, and 300 AD earthquakes on the segment. Our findings suggest that earthquake recurrence interval on the segment range from 276 ± 30 to ~700 years. The amount of displacement caused by surface faulting and earthquake recurrence interval indicates that the slip rate along the 1944 earthquake segment is 17–21 mm/yr in the late Holocene.

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Variability of Near-Term Probability for the Next Great Earthquake on the Cascadia Subduction Zone

November 2004 · Bulletin of the Seismological Society of America

The threat of a great (M 9) earthquake along the Cascadia subduction zone is evidenced by both paleoseismology data and current strain accumulation along the fault. On the basis of recent information on the characteristics of this subduction system, we estimate the conditional probabilities of a great earthquake occurring within the next 50 years and their variabilities. The most important ... [Show full abstract] vari-ation is associated with the existence of episodic slow slip on the deep portion of the subduction interface. We show that these events modulate the conditional probability dramatically over their 14-month cycle. During the 2-week slow-slip events, the weekly probability of a great earthquake is about 30 to 100 times as high as it is during any week of the rest of the year. Near-term probabilities also vary significantly with the assumed distribution of earthquake recurrence intervals. Under a reference scenario of unimodal distribution of recurrence intervals (about 500–600 years), the 50-year conditional probability is low (0–12% at a 95% confidence interval). How-ever, under a tantalizing bimodal distribution hypothesis, this probability could be either four times as high (6–45%) or four times as low (less than 1%), depending on whether the current interval is short (350 years) or long (850 years).

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Analysis of the 17 August 1999 M w 7.4 Izmit earthquake aftershocks and monitoring of the Ganos segm...

January 2008

Ethem Görgün

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Combined resonant column and cyclic triaxial tests to estimate the dynamic behavior of undisturbed s...

May 2023 · Geomechanics and Engineering

Turkey is one of the most important earthquake regions in Europe. This region has been exposed to many earthquakes of different magnitudes from past to present. It is of great importance to determine the dynamic properties of the soils for structures to be built in earthquake zones. In order to minimize the damages that may occur, the behavior of the soils under repeated loads should be known and ... [Show full abstract] taken into consideration in the design. In this study, 4 different point borings were taken near active fault lines in the North Anatolian fault zone (NAFZ). In order to determine the dynamic parameters of soils, both dynamic triaxial (TRX) and resonant column (RC) tests were carried out on undisturbed samples at every 5 m. As a result of the experiments, Vs and Gmax values were obtained from the field and differences were determined. The dynamic behavior of the soil was examined at varying depths with the comparison of reference models in the literature and compatible results were obtained. Finally, the behavior at the transition region is highlighted. As a result, three shear modulus and dumping ratio models have been proposed for clay soils to be used in different soil conditions.

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Plio-Quaternary Stress State in the Burdur Basin, SW-Turkey

March 2013 · Tectonophysics

This study defines the Plio-Quaternary to present day stress regime in the Burdur Basin, located at the northeastern end of the Fethiye–Burdur Fault Zone in SW Turkey. This fault length, which is considered the landward continuation of the Pliny-Strabo trench, is an important feature in SW Turkey. The inversion slip vectors measured on fault planes indicate a consistent normal faulting stress ... [Show full abstract] regime during Plio-Quaternary time, continuing into recent times as indicated by earthquake focal mechanism inversions. Both states have consistent NW–SE trending horizontal minimum stress axes (σ3). The orientation of fault sets is predominantly around the NE–SW direction in the major Fethiye–Burdur Fault Zone, making the extension NW–SE. The mean stress ratio is 0.74 indicating a triaxial stress state, which is clearly different from radial extension. The NW–SE extension is probably responsible for the formation of the Burdur Basin during Plio-Quaternary time. This extension, which is probably caused by slab-pull force due to the subduction process along the Cyprus arc, produces a dominant normal motion along the FBFZ.