https://scholars.lib.ntu.edu.tw/handle/123456789/614597
標題: | Slab-induced waveform effects as revealed by the TAIGER seismic array: Evidence of slab beneath central Taiwan | 作者: | Po-Fei Chen Craig R. Bina Hao Kuo-Chen Francis T. Wu Chien-Ying Wang Bor-Shouh Huang Chau-Huei Chen Wen-Tzong Liang HAO KUO-CHEN |
關鍵字: | Arrival time; Broadband arrays; Broadband linear array; Constructive interference; Contrast measurements; Full-waveforms; Gaussian fitting; Lateral heterogeneity; Pseudospectral method; Pulsewidths; S-waves; Seismic arrays; Slow phase; Sumatra; TAIGER; Teleseismic P waveforms; Upper mantle; Uppermost mantle; Variation pattern; Velocity structure; Wave forms; Waveform inversion; Interference suppression; Structural geology; Earthquakes; earthquake prediction; Gaussian method; geophysical array; P-wave; ray tracing; S-wave; seismic wave; slab; Sumatra earthquake 2004; upper mantle; wave propagation; waveform analysis; Taiwan | 公開日期: | 2012 | 卷: | 196-197 | 起(迄)頁: | 62-74 | 來源出版物: | Physics of the Earth and Planetary Interiors | 摘要: | Here we tackle a tectonically important question - the upper mantle velocity structure beneath central Taiwan - with seismically interesting observations - receiver-side slab waveform effects. We use teleseismic P waveforms of the NS broadband array deployed by the TAIGER project to examine patterns of variation in arrival time, pulse width, and amplitude - measuring the first two by Gaussian fitting - and contrast measurements of earthquakes to the southeast (SE earthquakes) with those of one Sumatra earthquake in order to focus on upper mantle heterogeneities. Overall variation patterns as a function of earthquake are compatible with ray-tracing predictions. Relative reduced arrival times and amplitudes at central Taiwan stations suggest the existence of a deep aseismic slab below. From simulations of 2-D wave propagation, we conclude that lateral heterogeneity of crust and uppermost mantle primarily contributes to variations in arrival time and only secondarily to variations in amplitude and pulse width. Furthermore, discrepancies between source-side and receiver-side waveform effects, where the latter are not always amplitude-reduced, are explained by constructive interference between the fast and slow phase. Thus, the use of full waveform information can provide independent constraints to complement results of previous studies. A future extension will be to incorporate S waves and apply waveform inversion to yield quantitative constraints. © 2012 Elsevier B.V. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84862824173&doi=10.1016%2fj.pepi.2012.02.004&partnerID=40&md5=01aff846bed165833b2a9e61e9d7364d https://scholars.lib.ntu.edu.tw/handle/123456789/614597 |
ISSN: | 00319201 | DOI: | 10.1016/j.pepi.2012.02.004 |
顯示於: | 地質科學系 |
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