Compound Pendulum to Monitor Hurricanes and Tropical Storms
  The period of an undamped compound pendulum has been selected to maximize the instrument's response to microseisms, when functioning as a type of horizontal seismometer. When functioning as a tiltmeter, the instrument is also capable of monitoring eigenmode oscillations of the Earth. Other instruments designed by the author, some of which were monitored during hurricanes, suggest that storm seismicity in the frequency range of this pendulum could aid the process of hurricane forecasting. 
Randall D. Peters