Backprojection of tropical cyclones in the Atlantic
Abstract
Tropical cyclones (hurricanes and typhoons) are mostly atmospheric phenomena but they also generate significant ground motions in the solid earth when they become strong. We monitored Hurricane Isaac in 2012 after it landfell and passed through Earthscope Transportable Array on land (Tanimoto and Valovcin, 2015). Other studies have also shown the tracking and monitoring of a hurricane in the middle of the Pacific (Hurricane Ioke in 2006), first by Zhang et al. (2010) and more recently other detailed studies on the same hurricane (e.g., Farra et al., 2016). The purpose of this study is to extend the latter type of observations by using P-wave beamforming for an array. In this study we look at the Atlantic hurricane season of 2012, with some focus on Hurricanes Sandy, Leslie and Michael. We perform a backprojection of 0.2 Hz waves recorded at a network of Southern California stations for the durations of the hurricanes. Peak amplitudes of the 0.2 Hz waves are offset from the center of hurricanes, but track their locations through time. The off-centered peak amplitude is likely a result of wave interaction between ocean waves and waves excited by the hurricane winds.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2017
- Bibcode:
- 2017AGUFM.S21C0733V
- Keywords:
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- 7299 General or miscellaneous;
- SEISMOLOGY