碩士 / 國立中央大學 / 地球物理研究所 / 98 / The tidal triggering effect on earthquake occurrence has been controversial for a long time. In this work, three catalogues of earthquakes occurring from 1973 to 2008 in Taiwan, Hawaii and Southern California regions are considered. Because earthquake data are nonlinear and/or
non-stationary, we propose an empirical mode decomposition (EMD)-based approach to analyze the temporal variations in earthquakes for investigating tidal triggering effect. The
original signal can be extracted into many components through EMD-based approach, which may contain different physical meanings. We then utilize spectral analysis on these components to study the tidal triggering effect. In order to increase signal-to-noise ratio, we apply stacking method to earthquake count time series based on inphase phenomena of theoretical Earth tides. We also compare non-declustered catalogue with two kinds of declustered catalogues. Finally, statistically significant tests are taken into account. In summary, our studies show that the tidal effect, particularly, the lunar tidal effect, is hidden in the raw earthquake occurrence data and can be extracted through the proposed approach. Namely, our results indicate that the lunar tidal force is likely to be one of earthquake triggering mechanisms.
| Identifer | oai:union.ndltd.org:TW/098NCU05134006 |
| Date | January 2010 |
| Creators | Hong-jia Chen, 陳宏嘉 |
| Contributors | Chien-chih Chen, 陳建志 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 107 |
Page generated in 0.0105 seconds