Gravimetric examination of Hagia Sophia's subsurface structure

@article{Friedrich1996GravimetricEO,
  title={Gravimetric examination of Hagia Sophia's subsurface structure},
  author={J{\"u}rgen Friedrich and Carl Gerstenecker and Onur G{\"u}rkan},
  journal={Journal of Geodesy},
  year={1996},
  volume={70},
  pages={645-651}
}
The subsurface structure of Hagia Sophia, one of the oldest sacred monuments in the world built between 532–537 under the reign of Justinian in today's Istanbul, has been investigated by using two relative LaCoste-Romberg gravimeters in order to detect hidden cavities which have also served as earthquake dampers in similar constructions. On the building's ground floor a grid of 100 points with a grid size of about 4.m was measured. The mean gravimetric point error was ± 3.10−8 ms−2. The result… 
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