Abstract
The horizontal-to-vertical spectral ratio technique has applied to detect the fundamental frequency at the sites of ambient noise recordings for New Domiat city. Noise measurements are acquired at 90 of sites for 1 h of continuous recording with a sampling rate of 100 Hz. Then, these data are processed following to SESAME project scheme. The presence of deep sedimentary basin in the Nile Delta suggests that the site response should be important. Consequently, the obtained fundamental frequency has lower values (0.2–0.6 Hz). However, low-frequency ground motions attenuate more gradually with distance and can excite vibrations in large engineered structures, such as tall buildings and long bridges. There is hazardous threat even from the distant earthquakes originated from Mediterranean convergence zone for the structures in the city. It is recommended that the results of this study must be taken into consideration from civil engineering point of view before construction of civil engineering structures at this part.
الملخص
تم تجميع بيانات الشوشرة الطبيعية بمدينة دمياط الجديدة على شبكة من النقاط بلغ عدد 90 نقطة موزعة على امتداد المدينة. أخذت هذه القراءات لمدة ساعة كاملة من التسجيل المستمر لضمان الحصول على أفضل النتائج. تمت معالجة هذه البيانات على حسب الأسلوب المتبع في برنامج J-SESAME. فوجود الحوض الرسوبي العميق بدلتا نهر النيل يشير لأهمية دراسة تأثير الموقع بالمدينة ، حيث أن المدينة تتعرض لخطر زلزالى من الزلازل التى تحدث بالبحر المتوسط حتى وإن كانت على مسافات بعيدة فقد أثبتت التجارب أن الحركة الأرضية البعيدة تضمحل تدريجيا وبالتالي فهى قادرة على توليد اهتزازات بالمباني الهندسية الهامة ( المباني العالية و الجسور الطويلة).
وقد أظهرت نتائج هذه الدراسة الهامة أن قيم التردد الأساسي تتراوح بين 2و. – 6و. هرتز، الأمر الذى يجب أخذها في الاعتبار أثناء تصميم المباني الهندسية المختلفة بمدينة دمياط الجديدة.
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Acknowledgments
This work has been carried out within Seismology Department, National Research Institute of Astronomy and Geophysics (NRIAG), Egypt. The authors greatly appreciate the head of Seismology Department for his continuous support and encouragement during the fulfillment of the field and office works. The authors are also greatly indebted to Egyptian General Organization for Physical Planning, Ministry of Housing and New urban settlements for their contribution during the fieldwork preparation and data acquisition.
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Abdel-Rahman, K., Abd El-Aal, AA.K., El-Hady, S.M. et al. Fundamental site frequency estimation at New Domiat city, Egypt. Arab J Geosci 5, 653–661 (2012). https://doi.org/10.1007/s12517-010-0222-2
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DOI: https://doi.org/10.1007/s12517-010-0222-2