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Estimation of the Source Region of Secondary Microseism Generated by Pacific Typhoons Using CTBTO Seismic Arrays

Description: 

Secondary microseism (SM) or double-frequency microseism, observed worldwide around the 8-second period, is known to occur due to non-linear interaction of opposing oceanic wavefields of similar wavenumbers (Longuet-Higgins, 1950). Hence, monitoring SM can serve as a proxy for comprehending oceanic activities and contribute to a better understanding of couplings between the atmosphere, ocean and solid earth. However, there is a debate regarding whether SMs are predominantly excited near coastlines in shallow water regions or whether it is possible to generate SMs in deep-sea regions. In this study, we initially investigated variations in power spectral densities of SMs at costal and island seismic stations nearby the track of Pacific typhoons in 2022, as well as at Comprehensive Nuclear-Test-Ban Treaty Organization (CTBTO) seismic arrays in Asia and Australia. We then compared these variations with the ocean wave model of Wave Watch III. The source regions of SMs recorded at CTBTO arrays were estimated through the triangulation method, utilizing back azimuths obtained from frequency-wavenumber analysis. These source regions were then compared with the best track data provided by the Joint Typhoon Warning Center (JTWC).

Session: ESC-SSA Joint Session: Climate Change and Environmental Seismology [Poster Session]

Type: Poster

Date: 5/3/2024

Presentation Time: 08:00 AM (local time)

Presenting Author: Yunah

Student Presenter: Yes

Invited Presentation: 

Authors