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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Chien-Wen Lin Chuang, L.Y.-L. Chen-Fen Huang Chin-Wu Chen Ban-Yuan Kuo |
| Copyright Year | 2014 |
| Description | Author affiliation: Inst. of Earth Sci., Taipei, Taiwan (Ban-Yuan Kuo) || Inst. of Oceanogr., Nat. Taiwan Univ., Taipei, Taiwan (Chien-Wen Lin; Chuang, L.Y.-L.; Chen-Fen Huang; Chin-Wu Chen) |
| Abstract | T waves excited by earthquakes propagate along the SOFAR channel with low transmission loss, and therefore can be recorded on land-based seismic stations and hydrophones located thousands of kilometers away from earthquake epicenters. Early T-wave observations are mostly based on recordings by land-based stations due to the mechanics of the energy conversion of acoustic waves into seismic phases. Recently, T-wave signals have also been detected by ocean-bottom seismometers (OBSs) at deep ocean basin offshore eastern Taiwan, raising the question of how deep ocean environment affects the generation and propagation of T-waves. In this study, to understand how acoustic energy scatters and interacts with different seafloor topography, we apply the acoustic ray theory to simulate acoustic propagation in the presence of realistic seafloor topography and sound speed profile. Our simulations indicate that seafloor topography indeed affects the acoustic propagation pattern, part of which may reach deep ocean regions. We also simulate seismic energy of T-waves by stacking energy coming from a series of potential conversion points within a specific time-window. The stacked energy distribution expresses a pattern similar to the envelope function of T-waves, indicating that the long-lasting waveform may result from a series of seismic-acoustic conversion processes. |
| Starting Page | 1 |
| Ending Page | 5 |
| File Size | 3847664 |
| Page Count | 5 |
| File Format | |
| e-ISBN | 9781479936465 |
| DOI | 10.1109/OCEANS-TAIPEI.2014.6964430 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2014-04-07 |
| Publisher Place | Taiwan |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Earthquakes Oceans Surfaces Acoustics Ray tracing Scattering Time-frequency analysis |
| Content Type | Text |
| Resource Type | Article |
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