Qopen for local earthquakes (less then 70 km)

[Petr Predein]

Hello, I am new to this mailing list, and very interesting in using Qopen
package for calculating intrinsic and scattering attenuation.
And my question to respected community is, can I use earthquakes with
epicenter very close to some station, with magnitudes no more then 3-3.5,
for example.
Normally, I read in (Sens-Schönfelder C., Wegler U., 2006: Radiative
transfer theory for estimation of the seismic moment, p. 3)
that hypocentral distance should be greater than 60 km, because it is
inappropriate to use mean velocity of S-waves about 3.5 km/s for shorter
distances (upper layers of the Earth crust?)
But it is also shown that Qopen uses improved method, unlike original
(Sens-Schönfelder C., Wegler U., 2006).
Also, I understand that it's incorrect one cannot use earthquakes with epi
distances less then several km up to 10 km, depending on frequency range.
Finally, can I use Qopen for small earthquakes with epicentral distance
from 10 to 70 km? (average depth is in range 15-20 km, hovewer).
And, if yes, which setting should I use in conf.json file to avoid big
errors, with stations on free surface.
Thanks in advance!
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