3-D seismic velocity structure with velocity discontinuities beneath the Japan Islands

在地震速度不连续体的接收函数成像中，假设一维速度结构从接收函数映射不连续体，如俯冲板块的顶部。然而，这个程序给出了一个错误的图像，在情况下，板是下降与高倾角。我们提出了一种新的速度不连续图绘制方法，该方法考虑了由于高度倾斜不连续引起的射线弯曲。利用矢量接收函数分析方法，成功圈定了日本西南部九州地区高倾角菲律宾海板块俯冲的三维图像

In receiver function imaging of seismic velocity discontinuities, 1-D velocity structure is assumed to map the discontinuities, such as the top of the subducting slabs, from receiver functions. However, this procedure gives a falseimage in the cases where the slab is descending with a high dip angle. We developed a new method to map the velocity discontinuities by taking the ray bending due to the highly dipping discontinuity into account. With this method using vectorial receiver function analyses we successfully delineated 3-D image of subduction Philippine Sea slab subducting with a high dip angle beneath the Kyusyu region, south west Japan