Seismology and Plate Tectonics by D.
Gubbins (1990)
Good overview of basic physics; has same objective as Shearer, i.e., produce
oncise text for one semester course
Modern Global Seismology by T. Lay
and T. Wallace (1995)
very good introduction to modern seismology, many examples from recent research;
theory not as rigorous as Aki & Richards