Modeling and Characterization of Microbarom Signals in the Pacific

Dr. Milton Garces, Primary Investigator, Dept. of Geophysics and Planetology, University of Hawaii

Hurricane Daniel

Fig. 1. Hurricane Daniel as seen by GOES 10 on July 26, 2000. ISLA will attempt to accurately depict the wind/wave field produced by Hurricane Daniel in order to model microbaroms produced by the nonlinear interaction of Daniel's ocean surface waves.

Fig. 2. Observed infrasonic arrival azimuth for microbarom signals (0.1-0.5 Hz) in comparison with azimuth from Hawaii to Hurricane Daniel's core (red line). (Click on image for larger display)
  • To investigate infrasound singal associated with sever weather in the Pacific Ocean in the 0.1-0.4 Hz frequency range, detected at CTBT array IS59 located above Kailua-Kona, Hawaii. 
  • To compare distinct infrasonic observations resulting from severe weather with theoretical predictions from existing source and propagation models.

Dr. Steven Businger, University of Hawaii at Manoa



Contact: (808) 956-2569

Expected Results:
  • To develop a relationship between storm activity in the Pacific with infrasonic detection in the 0.1-0.4 Hz band.
  • To model microbaroms in the Pacific originating from nonlinear ocean wave interactions from tropical cyclones and island reflection.
  • Project will complement the ongoing DTRA project titled "Characterization of the Infrasonic Field in the Central Pacific", because it will allow a more detailed study of a dominant signal in the 1 kt band.
  • Analyzing infrasound produced by severe weather provides and additional means of remote sensing over the ocean.
Project Schedule:
Effort       (Month)

Comparison of atmospheric/oceanic data w/ observed infrasound
Determine relationship between storm activity and microbarom detection
Modeling of microbaroms in the Pacific

For more information see