Geophysical Investigations at Cairo's Oldest, the Church of Abu Serga (St. Sergius), Cairo, Egypt
Publication: Publication Date: 1 August 2017Testing Method: ,
The results of an integrated geophysical survey at the archaeological site of Abu Serga church, Cairo, Egypt are presented and discussed. The aim was to investigate the ground conditions of the Church of Abu Serga (St. Sergius), the Cairo’s oldest, dated from 4th Century church, which is located at Qasr el-Shama in old Cairo in Egypt. In particular the objective is to study the subsurface geological structures at the location of the church, and to detect and possibly map any ancient remains concealed under the monument. The survey was conducted using two geophysical methods: the ground penetrating radar (GPR), which is a fully non-destructive method, and the electrical resistivity tomographies (ERTs). The usefulness of combining conventional geophysical mapping techniques and high resolution imaging methods in delineating shallow targets of archaeological interest at such complex archaeological sites, is studied. Ground penetrating radar time slices and 3D electrical tomography depth slices were used for the verification of specific anthropogenic anomalies, which were detected on the geophysical maps Processing of geophysical maps included filtering with the gradient and first derivative operators in the space domain and the upward continuation and Butterworth filters in the wave number domain. The integration of the geophysical measurements revealed that the present Crypt is not the original holy Crypt. The anomalous reflector is detected at depth of about 5 m below the sanctuary floor, in the form of buried ceiling of the original Crypt. The present Crypt is just a small low subterranean church belong to the 2nd century. High resistivity anomalies and distinct GPR signals were also observed deeper in the inner parts of the church. They are attributed to possible remains of ancient walls and surrounding tunnels, or other man-made structures concealed under the floor of the monument. The geophysical survey at Abu Serga church also demonstrates that the general features of the foundation soil are heterogeneous with abundance of fractures; the water table is very high at 1.8m below the sanctuary floors. The benefits of combined geophysical surveys in case of archaeological investigations at complex sites are highlighted.
- Simeka, M. (1930). Guide to the Coptic Museum and Ancient Churches and Monasteries. Vol. 1&2. Cairo: Egyptian Government Printing House. (In Arabic)
- Butler, A. J. (1884). Ancient Coptic Churches of Egypt. Vol. 1&2. London: Oxford at The Clarendon Press.
- Davis, J.L. and Annan, A.P. (1989) Ground-penetrating radar for high-resolution mapping of soil and rock stratigraphy. Geophysical Prospecting, vol. 37, 531–551.
- Guy, E., Daniels, J., Holt, J., Radzevicius, S. and Vendl, M. (2000) Electromagnetic induction and GPR measurements for creosote contaminant investigation. Journal of environmental and Engineering Geophysics, vol. 5, 11–19.
- Gaffney C. (2008). Detecting trends in the prediction of buried past: a review of geophysical techniques in Archaeology. Archaeometry, vol. 50, 313–336.
- Diamanti, N.G., Tsokas, G.N., Tsourlos, P.I. and Vafidis, A. (2005) Integrated interpretation of geophysical data in the archaeological site of Europos (Northern Greece). Archaeological Prospection, vol. 12, 79–91.
- Papadopoulos, N.G., Tsourlos, P., Tsokas, G.N. and Sarris, A. (2007) Efficient ERT measuring and inversion strategies for 3D imaging of buried antiquities. Near Surface Geophysics, vol. 5, 349–361.
- Tsokas. G.N., Tsourlos. P. I., Stampolidis. A., Katsonopoulou. D., Soter. S. (2009). Tracing a major Roman road in the area of Ancient Helike by resistivity tomography. Archaeological Prospection 16: 251–266
- Diamanti, N. and Redman, J.D. (2012) Field observations and numerical models of GPR response from vertical pavement cracks. Journal of Applied Geophysics, vol. 81, 106–116.
- Tsokas. N.G., Diamanti. N., Tsourlos. I.P., Vargemezis. G., Stampolidis. A., and Raptis. T. K. (2013). Geophysical prospection at the Hamza bey (Alkazar) monument, Thessaloniki, Greece. Mediterranean Arhaeology and Archaeometry, Vol. 13, No 1, pp.9–20.
- Savvaidis, A., Tsokas, G.N., Liritzis, Y. and Apostolou M. (1999) The location and mapping of ancient ruins on the castle of Lefkas (Greece) by resistivity and GPR methods. Archaeological Prospection, vol. 6, 63–73.
- Leckebusch, J. (2000) Two and three – dimensional ground penetrating radar surveys across a medieval choir: a case study in Archaeology. Archaeological Prospection, vol. 7, 189–200.
- Leucci, G. (2002) Ground penetrating radar survey to map the location of buried structures under two churches. Archaeological Prospection, vol. 9, 217–228.
- Binda, L., Saisi, A., Tiraboschi, C., Valle, S., Colla, C. and Forde, M. C. (2003). Application of sonic and radar tests on the piers and walls of the Cathedral of Noto. Construction and Building Materials, vol. 17, 613–627.
- Piro, S., Goodman, D. and Nishimura, Y. (2003) The study and characterization of Emperor Traiano’s Villa (Altopiani di Arcinazzo, Roma) using high-resolution integratedgeophysical surveys. Archaeological Prospection, vol. 10, 1–25.
- Linford, N. (2004) From hypocauset to hyperbola: Ground penetrating radar surveys over mainly Roman remains in the U.K. Archaeological Prospection, vol. 11, 237–246.
- Nuzzo, L. (2005) Identification and removal of above – ground spurious signal in GPR archaeological prospecting. Archaeological Prospection, vol. 12, 93–103.
- Solla, M., Lorenzo, H., Novo, A. and Rial, F.I. (2010) Ground-penetrating radar assessment of the medieval arch bridge of San Anton, Galicia, Spain. Archaeological Prospection, vol. 17, 223–232.
- Hemeda, S. (2012). Ground Penetrating Radar (GPR) Investigations for Architectural Heritage Preservation: The Case of Habib Sakakini Palace, Cairo, Egypt. Open Journal of Geology, 2, 189–197.
- Hemeda, S. (2013). Electrical Resistance Tomography (ERT) Subsurface Imaging for Non- destructive Testing and Survey in Historical Buildings Preservation.
- Australian Journal of Basic and Applied Sciences, 7(1): 344–357.
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