Examination of the Arc-arc collision process and its relationship with deformation mechanism of the Pacific slab, beneath the Hokkaido

利用来自全国密集地震台网和密集临时地震台网的走时数据，我们获得了北海道角落下的高分辨率三维地震速度结构。我们的研究结果表明，这两次大而异常深的内陆地震发生在东北-西南挤压应力场下的尖锐物质边界上，这是由持续的弧-弧碰撞过程引起的。

Using travel time data from both a nationwide dense seismic network and a dense temporary seismic network, we obtain a high-resolution three-dimensional seismic velocity structure beneath the Hokkaido corner. Our results suggest that these two large and anomalously deep inland earthquakes occurred at sharp material boundaries under a northeast-southwest compressional stress field caused by ongoing arc-arc collision process.