Bulletin of the Seismological Society of America; February 2006; v. 96; no. 1;
p. 200-214; DOI: 10.1785/0120050038
© Seismological Society of America
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Figure 6. Spectral amplitudes of records for the events with 2.5 
ML 3 (gray circle) versus hypocentral distance, at the
frequencies 2, 5, and 10 Hz. The left frames are for P waves, the right
ones for S waves. The solid curves are logA(f,
r) obtained from inversion performed at the corresponding frequency. An
arbitrary offset has been added to the spectral-amplitude data to make the
comparison easier.
