Microseisms from Hurricane "Hilda"

Bremaecker, J. Cl. De

doi:10.1126/science.148.3678.1725

Cited by 6 publications

(1 citation statement)

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“…Observations have repeatedly indicated that large maritime storms produce microbaroms; however, the specifics of such generation is still a topic of some debate [ Banerji , ; Bremaecher , ; Hetzer et al , ; Stopa et al , , ]. It has been proposed by Hetzer et al [] that the interaction of the storm‐induced swell with the background swell can produce the counterpropagating waves required to generate microbaroms.…”

Section: Introductionmentioning

confidence: 99%

Observations of the refraction of microbaroms generated by large maritime storms by the wind field of the generating storm

Blom

Waxler

Frazier

et al. 2014

J. Geophys. Res. Atmos.

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Microbaroms are a continuous infrasonic signal in the 0.15 to 0.3 Hz band caused by the collision of oceanic surface waves of equal period. Such signals are often generated by large maritime storms. Current formulation of the generation mechanism predicts that the microbarom source location due to a large maritime storm in the open ocean is generally located several hundreds of kilometers from the eye of the storm. Assuming such a source location to be correct, propagation of the microbaroms along paths which pass near the storm center as well as those which propagate away from the storm structure have been examined using geometric acoustics. Microbarom propagation paths which pass near the storm center are refracted by the storm winds and are found to have back azimuths directed toward a virtual source around the storm center. Microbarom propagation paths which do not pass near the storm center are found to have back azimuths directed toward the actual source region. To validate these predictions, data from microbarom signals generated by hurricanes in the Atlantic Ocean have been collected along the east coast of the United States during the 2010 and 2011 Atlantic hurricane seasons. Data from several storm events are presented here for comparison with model predictions. In general, the observations are in agreement with the predictions of the propagation model.

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