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三、壳内低速层和壳内高导层自七十年代以来,有大量文献报导了关于大陆地壳内的低速层和高导层。壳内低速层具有较低的速度值,一般为5.5公里/秒左右,比其直接上伏岩层速度值低达8—12％,具有较高的泊松比和异常低的Q值,因而往往认为它们是壳内的一个较软层位。壳内低速层埋深一般在15—20公里、或10—15公里左右,厚约数公里。壳内高导层或低阻层具有很低的电阻率
Third, the low-velocity shell and the shell within the high-conductivity Since the seventies, a large number of reports on the continental crust of the low-velocity layer and high conductivity. The low velocity layer in the shell has a lower velocity value, typically around 5.5 km / s, as low as 8-12% over its immediate overburden velocity, with a high Poisson’s ratio and an unusually low Q value, Think of them as a softer layer in the shell. Depth of the low-speed shell layer is generally 15-20 km, or about 10-15 km, a few kilometers thick. The high-conductivity or low-resistance layer in the shell has a very low resistivity