seismic hazard assessments_at_fatimid_cairo__egypt
DESCRIPTION
Presentation of a scientific paper at GSF 2013 in Oman. The paper is focusing on the determination of seismic Hazards at the Islamic Cairo monumental sites.TRANSCRIPT
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Seismic Hazard Assessments at Fatimid Cairo, Egypt.
Amin E. Khalil and Hesham E. Abdel –HafizPresented by
A. E. Khalil
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Outlines
History and location
Seismicity
Methodology
Results
Conclusions
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History
• It was founded in 969 AD.• Nicknamed "the city of a
thousand minarets" for its preponderance of Islamic architecture.
• Cairo was founded by theFatimid dynasty in the 10th century AD, but the land composing the present-day city was the site of national capitals whose remnants remain visible in parts of Old Cairo.
• The building inside and at the outskirt s of Fatimid (old Cairo) belongs to eras from the Fatimid to present . With most of buildings dated back to at least 300 years.
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Location
Fatimid Cairo
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Seismicity
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Methodology
Deterministic Probabilistic
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Seismic Sources
After Deif et. al. 2010.
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Site Characterization
Due to the present situation at the study area, only Hvsr technique was applied. Nakamura (2013, Personal communication) argued that the method is capable of producing amplification factor and fundamental freq. Fo for a site. However, there are general opinion that HVSR is acceptable for Fo only
HVSR was conducted at 9 points
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Results
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Conclusion• Fatimid Cairo is a city of more than 1000 years old with
most of the buildings hundreds of years old.• Deterministic and probabilistic seismic hazards were
applied to aid the efforts for repairing and restoration of the archaeological buildings and human heritage.
• Deterministic approach suggests that a PGA of about 200 gals is the maximum expected.
• PSHA SA results for 72, 475 and 2475 years are about 50, 150 and 310 gals respectively.
• HVSR method is applied to determine Fundamental frequencies at 9 sites in the study area, the fundamental frequencies ranges from 0.5 to 1.1 Hz
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Thank you