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| Titel |
Engineering geologic assessment of the slope movements and liquefaction failures of the 23 October 2011 Van earthquake (Mw= 7.2) |
| VerfasserIn |
A. Karakaş, Ö. Coruk, B. Doğan |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 13, no. 4 ; Nr. 13, no. 4 (2013-04-26), S.1113-1126 |
| Datensatznummer |
250018419
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| Publikation (Nr.) |
 copernicus.org/nhess-13-1113-2013.pdf |
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| Zusammenfassung |
On 23 October 2011, a Mw = 7.2 earthquake occurred in the Van Province in
eastern Turkey, killing 604 people. The earthquake was triggered by a thrust
fault due to a compression stress in the region, and caused extensive damage
over a large area. Many structures in the earthquake region collapsed, and
the damage spread from the city of Van to the town of Erciş, in a
distance of 60 km. The earthquake generated several slope movements and
liquefaction failures in the region, and this study evaluates these processes
from the perspective of engineering geology, and presents field and
laboratory results related to these processes. Attenuation
relationships were used for estimation of peak ground accelerations (PGAs),
and an empirical liquefaction evaluation method employing ground
accelerations was used to define threshold accelerations initiating the
liquefaction.
The results demonstrate that landslides were widespread and more frequently
observed in the field in comparison with earthflows and rockfalls. Flow-type
liquefaction and lateral spreading was found to be widespread and more
common than the liquefaction-related settlement. The minimum threshold
acceleration value for the initiation of soil liquefaction was calculated to
be 188.87 cm s−2 (~0.19 g) in the earthquake region.
Laboratory results indicated that the soil liquefaction was closely
associated with grain size. The slope instabilities, liquefaction and
associated ground failures occurred mainly in rural areas, and their impact
on structures was quite low as compared to the human loss and structural
damage by the earthquake. |
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