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Register a new userEstimation of Surface Geology Effect on Site Response Based on Nakamura's Technique-A Case Study in Eastern Ghoota, Damascus city, Syria
دراسة تأثير الجيولوجيا السطحية على الاستجابة الأرضية باستخدام تقنية نكامورا ـ دراسة حالة في منطقة الغوطة الشرقية، دمشق، سورية
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Damascus University ورقة بحثية
Publication date
2012
fields
Geology
and research's language is
العربية
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Shamra Editor
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درستْ خصائص التربة الديناميكية في منطقة الغوطة الشرقية الواقعة في حوض دمشق الرسـوبي، بهدف تقدير قيم الدور المسيطر و معامل التضخيم لكل موقع، باستخدام تقنية نكامورا، و هـي مـن أهـم التقنيات التجريبية الحديثة المستخدمة عالمياً في دراسة تأثير الجيولوجيـا الـسطحية علـى الاسـتجابة الأرضية و أكثرها شيوعاً. نُفّذَ نحو 1000 قياس للضجيج الزلزالي موزعـة علـى 265 موقعـاً تغطـي التوضعات الجيولوجية المختلفة، و بعد تحليلها حسبت المنحنيات البيانية للنسبة الطيفية ثم حـددتْ قـيم الدور المسيطر و معامل التضخيم، و قد أظهرت نتائج قياسات الضجيج الزلزالي وجود توافـق جيـد مـع المعطيات الجيولوجية و نتائج نمذجة السبور الجيوتكنيكية، إذ تتغير قيم الدور المسيطر و معامل التـضخيم من موقع إلى آخر بشكل واضح.
The dynamic soil characteristics in Eastern Ghoota, which is located on Damascus basin, was studied to estimate the predominant period and the amplification factor in all sites, using Nakamura's technique. This technique is considered as one of the important empirical techniques used in the world to study the surface geology effects on site response. About 1000 seismic noise measurements were carried out in 265 sites covering different geology deposits. The H/V spectra ratio were calculated and analyzed to determine the site predominant period and amplification factor. The results exhibit good correlation with the local geology and the modeling of geotechnical boreholes, whereas the predominant period and amplification factor values vary clearly from site to site.
References used
Abou Romieh, M. Westaway, R. Daoud, M. Radwan, Y. Yassminh, R. Khalil, A. Al-Ashkar, A. Loughlin, S. Arrell, K and Bridgland, D. (2009). Active crustal shortening in NE Syria revealed by deformed terraces of the River Euphrates, Terra Nova, 21, 427-437
Alchalbi, A. Daoud, M. Gomez, F. McClusky, S. Reilinger, R. Abu Romeyeh, M. Alsouod, A. Yassminh, R. Ballani, B. Darawcheh, R. Sbeinati, R. Radwan, Y. AlMasri, R. Bayerly, M. Al Ghazzi, R and Barazangi, M. (2009). Crustal deformation in northwestern Arabia from GPS measurements in Syria: Slow slip rate along the northern Dead Sea Fault; Geophysical Journal International. Vol. 180: 125-135
Ambraseys, N. N and Barazangi, M. (1989). The 1759 earthquake in the Bekaa Valley: implications for earthquake hazard assessment in the Eastern Mediterranean region, J. Geophys. Res., 94, 4007-4013
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