<div dir="ltr"><div>Hello, I am new to this mailing list, and very interesting in using Qopen package for calculating intrinsic and scattering attenuation. <br></div><div>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. <br></div><div>Normally, I read in (Sens-Schönfelder C., Wegler U., 2006: Radiative transfer theory for estimation of the seismic moment,
p. 3)<br></div><div>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?)</div><div>But it is also shown that Qopen uses improved method, unlike original (Sens-Schönfelder C., Wegler U., 2006).<br></div><div></div><div>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.</div><div>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).</div><div>And, if yes, which setting should I use in conf.json file to avoid big errors, with stations on free surface.<br></div><div>Thanks in advance!<br></div><div><br></div></div>