Regional Waves
Regional Waves : Seismic waves which propagate laterally in the crust and uppermost mantle. Examples are Pg, Pn, Sn, Lg, and Rg. These waves are distinguished from teleseismic waves which propagate in the deeper interior of the Earth. Regional waves typically propagate over epicentral distances up to 1500 km (somewhat further, for Lg), and their travel speed can be very different for different regions. For example, Pn wave, which travels along the top of mantle, can arrive 8 seconds earlier in some regions and 5 seconds later in other regions as compared to the global average arrival time for the same distance. See Richards (2002)
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