Sediment velocities and deep structure from wide-angle reflection data around Leg 116 sites
Sediment velocities and deep structure from wide-angle reflection data around Leg 116 sites
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来自 Leg 116 站点周围广角反射数据的沉积物速度和深层结构
DOI：
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发表时间：
1990
期刊：
影响因子：
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通讯作者：
R. Scrutton
中科院分区：
文献类型：
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作者：
J. Bull;R. Scrutton
在大洋钻探计划第116航次考察的两个断块内拍摄的六个广角反射剖面的减少与大洋钻探计划声波测井相结合，产生了该地区的速度-深度结构。沉积速度由近地表的1.6-1.7 km/s增加到基底正上方的3.4-3.5 km/s，速度梯度为0.75/s。深度转换的地震反射剖面表明，变形前的基底表面是类似的深海丘陵地形在太平洋发展。第2海洋层顶部4.1公里/秒的速度被确定为2A层。假设速度梯度为0.7/s，则第2层厚度的估计值为1.5 km。可以根据可能比正常洋壳薄的第3层来解释剩余深度异常。
The reduction of six wide-angle reflection profiles shot within the two fault blocks visited by Ocean Drilling Program (ODP) Leg 116 in combination with the ODP sonic logs has produced a velocity-depth structure for this area. The sediment velocity increases from 1.6-1.7 km/s in the near surface to 3.4-3.5 km/s immediately above basement with a velocity gradient of 0.75/s. A depth converted seismic reflection profile suggests that the pre-deformational basement surface was similar to the abyssal hill topography developed in the Pacific Ocean. A velocity for the top of oceanic layer 2 of 4.1 km/s was identified as layer 2A. Assuming a velocity gradient of 0.7/s, an estimate of layer 2 thickness was obtained of 1.5 km. It is possible to interpret residual depth anomalies in terms of a layer 3 that may be thinner than for normal oceanic crust.