G-waves (Gn)
G-waves (Gn) : Another name for very long-period Love waves. Because the group velocity of Love waves in the Earth is nearly constant (4.4 km/sec) over the period range from about 40 to 300 seconds (See: Fig. 2.12 ??? in Chapter 2 of this Manual), their waveform is rather impulsive, and they have received this additional name. They are called G-waves after Gutenberg. It takes about 2.5 hours for G-waves to make a round trip of the Earth. After a large earthquake, a sequence of G-waves may be observed. They are named G1, G2, . . ., Gn, according to the arrival time. The odd numbers refer to G-waves traveling in the direction from epicenter to station, and the even numbers to those leaving the epicenter in the opposite direction and approaching the station from the antipode of the epicenter. See: Section 2.3.4 ???, Fig. 2.18 in Chapter 2 of this Manual and Kulhanek (2002, p. 346)
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