A theoretical study of special acoustic effects caused by the staircase of the El Castillo pyramid at the Maya ruins of Chichen-Itza in Mexico.

@article{Declercq2004ATS,
  title={A theoretical study of special acoustic effects caused by the staircase of the El Castillo pyramid at the Maya ruins of Chichen-Itza in Mexico.},
  author={Nico F. Declercq and Joris Degrieck and Rudy Briers and Oswald Leroy},
  journal={The Journal of the Acoustical Society of America},
  year={2004},
  volume={116 6},
  pages={
          3328-35
        }
}
It is known that a handclap in front of the stairs of the great pyramid of Chichen Itza produces a chirp echo which sounds more or less like the sound of a Quetzal bird. The present work describes precise diffraction simulations and attempts to answer the critical question what physical effects cause the formation of the chirp echo. Comparison is made with experimental results obtained from David Lubman. Numerical simulations show that the echo shows a strong dependence on the kind of incident… 
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Progress is reported in understanding physical and mythological elements of the recently reported discovery that handclaps at the Mayan Temple of Kukulkan at Chichen Itza, Mexico produce birdlike
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Handclaps evoke impressive chirped echoes from the unusually narrow limestone staircases of the Mayan pyramid at Chichen Itza, located in Mexico’s northern Yucatan. This highly conspicuous acoustical
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