Po/So PHASES
Po/So PHASES
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DOI：
10.4294/jpe1952.35.111
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发表时间：
1987
期刊：
影响因子：
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通讯作者：
D. Walker;C. Mccreery
中科院分区：
文献类型：
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作者：
D. Walker;C. Mccreery
在威克岛附近部署了两个月的1500公里长的海底水听器（OBH）阵列成功地记录了西北太平洋盆地边缘沿着许多地震的Po/So震相。从20°（2，200 km）到34°（3，800 km）震中距离的10个浅源（<100 km）事件的数据被用来计算Po和So开始时通过阵列的传播速度。Po和So的速度分别为7.96±0.05 km/s和4.58±0.06 km/s。与这些速度相关的走时截距分别为-7.21 2. 40 s和-12.84 7. 61 s。这些速度显着低于以前报告的西北太平洋使用单站数据。虽然低速和负截距可能只是数据偏差的结果，但也可能是由于沿传播路径的方位各向异性沿着的影响，或由于传播速度随岩石圈年龄的增加，或由于震源附近的传播模式不同。
Po/So phases from numerous earthquakes along the margin of the Northwestern Pacific Basin were successfully recorded by a 1, 500-km-long ocean bottom hydrophone (OBH) array deployed for two months near Wake Island. Data from ten shallow-focus (<100km) events at 20°(2, 200 km) to 34°(3, 800 km) epicentral distance were used to compute propagation velocities across the array for the onsets of Po and So. The values found are 7.96±0.05 km/s for Po and 4.58±0.06 km/s for So. Travel-time intercepts associated with these velocities are, respectively, -7.21±2.40 s and -12.84±7.61 s. These velocities are significantly lower than those previously reported for the Northwestern Pacific using single station data. Although the low velocities and negative intercepts could simply be the result of bias in the data, they might also be due to the effects of azimuthal anisotropy along travel paths, or to increasing propagation velocity with lithospheric age, or to a different mode of propagation near the source.