Transition Zone 2
Transition Zone 2 :
A term in the study of the Earth's interior, referring to the depth range from 410 to about 800 km, in which solid-state phase transitions produce strong seismic velocity gradients and sharp discontinuities. Sometimes used only for the depth range 410- 660 km between the two major discontinuities at those depths. See the depth range of TZ in Fig. 2.53 ??? of Chapter 2 of this Manual; see also Lay (2002)
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