Seismic Attenuation in Ocean Crustal Layer 3 Hydrophone Instruments

该项目将首次直接测量海洋下地壳的表观衰减（逆Q），并将在原位条件下确定特定岩性和结构特征的Q。PI将应用谱比技术计算从735海洋钻井项目现场垂直地震剖面记录的地震图中分离出来的下行波的谱。视衰减结果可以直接用于海洋反射和折射数据的合成地震记录建模，从而更真实地表示到达振幅，这对于评估地壳结构的细节至关重要。

This project will make the first direct measurement of apparent attenuation (inverse Q) on lower ocean crust and it will determine Q for specific lithologies and structural features under in situ conditions. The PI's will apply the spectral ratio technique to spectra computed on down-going waves separated from seismograms recorded during a vertical seismic profile made at Ocean Drilling Program Site 735. The apparent attenuation results can be used directly in synthetic seismograms modeling of marine reflection and refraction data allowing more realistic representation of arrival amplitudes, which are critical in evaluating the details of crustal structure.