Seismic Hazard Assessments at Fatimid Cairo, Egypt.

Amin E. Khalil and Hesham E. Abdel –HafizPresented by

A. E. Khalil

Outlines

History and location

Seismicity

Methodology

Results

Conclusions

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.

Location

Fatimid Cairo

Seismicity

Methodology

Deterministic Probabilistic

Seismic Sources

After Deif et. al. 2010.

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

Results

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

Thank you