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geometrical coefficient is nearly zero. At a source distance beyond 100 km, corresponding to
the Lg phase, the geometrical spreading coefficient is 0.5.
The frequency-dependent Q is estimated as Q — 481.5 • /° 31 .
Preliminary study of the digital seismograph data of the same 44 events recorded by Hong Kong
Observatory seismic monitoring network-indicates that the proposed attenuation model is likely
to be applicable for Hong Kong Region
Acknowledgments
The work reported in this paper is a part of the ASD Project on ground motion and response spectra
for seismic design in Hong Kong funded by The Hong Kong Polytechnic University.
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