Determination of Crustal Thickness and Pn Velocity: Yukon Flats and Central Interior Alaska

地体向大陆边缘的吸积似乎是我们今天所看到的大陆形成的一个重要过程。至少从中生代开始，阿拉斯加就是地体的聚集地。这项建议涉及调查与一个区域有关的地壳厚度和Pn速度，该区域由堆积和可能堆叠的地体组成。这项计划中的实验使用了阿拉斯加大学现有的地震仪网络，并由育空平原地区的地震台扩大，以记录一些化学爆炸的信号。站点的分布应该可以查看阿拉斯加山脉、塔纳纳山谷和育空平原上的PN到达人数。后者是一个巨大的、地质上未知的区域，被最近的沉积物覆盖，在一些模型中，它被认为是被困住的洋壳。

The accretion of terranes to continental margins seems to have been an important process in the formation of the continents as we see them today. Alaska has been the site of terrane accretion at least since Mesozoic time. This proposal is concerned with the investigation of the crustal thickness and Pn velocities associated with an area that consists of accreted and possibly stacked terranes. The planned experiment uses the existing seismograph network of the University of Alaska, augmented by stations in the Yukon Flats area, to record the signals from a number of chemical explosions. The distribution of stations is such that it should be possible to look at Pn arrivals along sections across the Alaska Range, the Tanana Valley and the Yukon Flats. The latter is a large, geologically unknown area covered by recent sediments, which on some models is thought to be trapped oceanic crust.