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| 題 名 | S-Wave Attenuation Structure in the Taiwan Area and its Correlation to Seismicity=臺灣地區S波衰減構造及其與地震活動度之關係 |
|---|---|
| 作 者 | 陳光榮; | 書刊名 | Terrestrial, Atmospheric and Oceanic Sciences |
| 卷 期 | 9:1 1998.03[民87.03] |
| 頁 次 | 頁97-118 |
| 分類號 | 351.249232 |
| 關鍵詞 | 臺灣地區; S波衰減構造; 地震活動度; Q structure; Attenuation time value; Seismicity; |
| 語 文 | 英文(English) |
| 英文摘要 | S-wave amplitude data from the Taiwan Telemetered Seismographic Network (TTSN) and the Central Weather Bureau Seismographic Network (CWBSN) are used in a tomographical inversion for a three-dimensional S-wave attenuation structure beneath the Taiwan area. The data consist of three-dimensional, digital seismograms of 137 earthquakes with magnitudes between 3.0 and 5.0. The S-wave attenuation structure is obtained through the use of the damped least-squares method from attenuation time value (t*) and travel times. Attenuation time value is calculated by using the spectral decay method under the assumption that t* is independent of frequency. S-wave spectra are corrected for a ω□ source spectrum model. The frequencies of instrument response above 25 Hz or below 4 Hz usually have large uncertainty. Therefore, the least-squares line fitting is performed in the frequency band of 4 to 25 Hz. The results here show that the distribution pattern of the Q□ values in the Taiwan area correlates well with seismicity. In the upper crust (depths of between 0 to 15 km), the region of lower Q□ area correlates with higher seismicity. However, in the lower crust and upper mantle (15 to 75 kin), the area of higher seismicity correlates with the regions of higher Q□ values. |
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