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題名 | Scattering Effects of SH Waves Due to an Irregular Structure--A Case at the SMART1 Array Site=平面SH波入射於不規則地下構造所造成的散射效應﹣﹣在SMART1陣列區的一個特例 |
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作者 | 邱宏智; 鄧大量; 黃孔亮; | 書刊名 | 中國地質學會會刊 |
卷期 | 34:2 1991.04[民80.04] |
頁次 | 頁91-110 |
分類號 | 354.4 |
關鍵詞 | SH波; SMART陣列區; 入射; 不規則; 平面; 地下構造; 散射效應; |
語文 | 英文(English) |
中文摘要 | 本文利用邊界積分法探討蘭陽平原地下構造所造成的震波散射效應,所使用的介質是二維簡化模型,入射波為平面SH波而其頻率範圍為0∼0.45Hz。根據所得的結果,介質反應受平面波入射角及沖積層厚度的影響很大,當波長接近不規則體特定尺寸時,介質反應隨空間的變化會有顯著改變,最大放大倍率可達半空間介質反應的3.5倍;另外地震動隨觀測點所在的深度有逐漸減小的趨勢。 |
英文摘要 | A numerical scheme. based on the boundary integral equation formulation is used to study the scattering effects due to the geometric irregularities of a subsurface structure. This scheme is applied to a two-dimensional earth model derived from a geological cross-section of an alluvial plain over which the SMART-1 array is located. The scattering effects due to an input of plane SH waves with frequencies ranging from 0 to 0.45 Hz are examined. The medium response and the ground motions for both surface and at depth sites due to a Ricker wavelet are calculated. Results show that the medium response at a site is strongly dependent on the incident angle of the plane waves and the thickness of the alluvium beneath the station. The spatial variation of the medium response is appreciable and becomes very significant when the wavelength approaches the characteristic dimension of irregularities. The maximum amplification factor for the cases considered reaches 3.5 times larger than the surface amplification of a half-space medium. For larger depth the ground motion becomes progressively smaller than that of surface observations. |
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