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THE ENVIRONMENT
seismographs at the Observatory's headquarters detect tremors world-wide and information on significant tremors is made public through the media. In addition, three strong-motion accelerographs were installed on different geological sites. On average, Hong Kong experiences two to three minor earth tremors every year. Seismic data are used by structural engineers in building design, and by local and overseas scientific institutions.
The Hong Kong Time Standard is provided by a caesium beam atomic clock. Accuracy within fractions of a microsecond a day is maintained. A six-pip time signal is sent to Radio Television Hong Kong for broadcast at quarter-hour intervals. A time-checking service is also provided through the Internet.
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