简单回答:实际上有两个不同的古腾堡不连续面，其中一个对应于定义岩石圈-软流圈边界，或LAB的一种方式。< / p >

(The abstract of this article in Science refers to the LAB version of the Gutenberg discontinuity as G.)

The boundary between the lithosphere and asthenosphere can be defined in several ways: mechanically, thermally, rheologically, compositionally, and finally seismically. All are approximations for something humans will never be able to access directly.

Wikipedia has this to say about the seismic definition:

The seismic LAB (i.e. measured using seismological observations) is defined by the observation that there exists seismically fast lithosphere (or a lithospheric lid) above a low-velocity zone (LVZ).

The seismic LVZ was first recognized by Beno Gutenberg, whose name is sometimes used to refer to the base of the seismic LAB beneath oceanic lithosphere. The Gutenberg discontinuity coincides with the expected LAB depth in many studies and has also been found to become deeper under older crust, thus supporting the suggestion that the discontinuity is closely interrelated to the LAB.