Figure 9. Average (thin lines) ±1 standard deviation (gray area) integrated
energy versus distances, at frequencies 1.6, 3.2, and 8 Hz;
E1, E2, and E3 are
the integrated energy for three different lapse times. The energy is corrected
for the geometrical spreading (4
r2) and normalized to
coda (Aki, 1980). The thick lines
represent the best- fit solution obtained using the Monte Carlo method
(Hoshiba, 1991), corresponding
to the B0,
pair indicated
inside each panel. For frequency 1.6 Hz (top-left panel) the dotted line
corresponds to the best-fit solution obtained by applying the Hoshiba
(1997) method to the model
described in Table 2. In the
bottom-right panel,
(dotted line),
(dashed line), and
(continuous line)
versus frequency are compared to QS(f) obtained via
the spectral inversion for distance in the range 10–38 km (vertical bars)
and 60–80 km (gray vertical bars).