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A high-speed data acquisition system to measure telescope response to earthquake-induced ground motion

The Gemini Observatory operates two telescopes, both in geographical areas that pose a significant risk of damage due to earthquakes. To assess the potential of damage to telescope systems due to earthquake induced ground motion, a system of accelerometers, data acquisition hardware and data analysis software is being installed at each telescope. Information from these sensors will be used to evaluate the response at various locations on the telescope including the primary and secondary mirror support structures, instruments, telescope mount, pier and adjacent ground. A detailed discussion of the design of this sensor system is presented. Real time applications and potential future upgrades are also discussed, including provisions for automatic subsystem parking and shutdown, laser shuttering, alarms and future structural modifications designed to reduce the dynamic response of the telescope and its subsystems to earthquake induced ground motion.