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頁籤選單縮合
題 名 | Source Parameters of Regional Earthquakes in Taiwan: July 1995-December 1996=臺灣地區地震震源參數:1995年7月至1996年12月 |
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作 者 | 高弘; 簡珮如; | 書刊名 | Terrestrial, Atmospheric and Oceanic Sciences |
卷 期 | 10:3 1999.09[民88.09] |
頁 次 | 頁585-604 |
分類號 | 354.4 |
關鍵詞 | 地震; 震源參數; Broadband seismic network; Earthquake source parameter; Waveform inversion; Taiwan; |
語 文 | 英文(English) |
英文摘要 | Systematic determination of reliable source parameters for regionalearthquakes in Taiwan, particularly offshore events with mb<5.5, has beena difficult task because of poor coverage by the local network and the lackof signals at teleseismic distances. Establishment of the "Broadband Arrayin Taiwan for Seismology (BATS)" has greatly improved such a task throughmoment-tensor inversion of regional waveforms. Our inversion algorithmdiffers from previous studies in two major aspects. First, we evaluate thecharacteristics of background noise for individual stations. The results arethen used to determine the lower corner of the frequency band used in theinversion to maximize the long-period information in waveforms. The highercorner is set at 0.06-0.08 Hz to avoid the effects of strong lateral heterogeneity and possible epicentral mislocation. Second, to further reduce theuncertainty caused by complex structures, a two-step procedure is adaptedto select the best velocity models for different stations in calculating thesynthetics. The inversion quality is classified by a combination of a letter(A-F) and a digit (1-4) reflecting the waveform misfit and the compensatedlinear vector dipole (CLVD) component) respectively. In total, source parameters of 36 events that occurred between July 1995 and December 1996are reported in this study. For the few events that are big enough to bestudied teleseismically, most of our solutions are consistent with those reported by other institutions. We intend to make our inversion results available on a routine basis that they will not only be able to provide precisesource parameters for smaller regional earthquakes, but will also serve asan alternative to independently examine solutions of large and moderatesized events reported from other sources. |
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