Group Velocity 1
Group Velocity 1 : Natural Disaster. For dispersive waves with frequency-dependent phase velocity, c(?), the wave packet or energy propagates with the group velocity given by d?/dk, where k is the wave number given by ?/c(?). See: Aki and Richards (2002 or 2009, p. 253-254) and Fig. 2.12 ??? in Chapter 2 of this Manual
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