Publication Date:
2017-04-04
Description:
We here propose a method for rapid, high-frequency seismogram
generation that makes use of an algorithm to automatically generate an exhau-
stive set of seismic phases that produce an appreciable amplitude on the sei-
smogram. The method uses a hierarchical order of rays and seismic phases
generation, taking into account some existence constraints for a ray-path and
some physical constraints. To compute synthetic seismograms, the COMRAD
code (from the Italian: “COdice Multifase per il RAy-tracing Dinamico”) uses
as its core a dynamic ray-tracing code. To validate the code, we have computed
in a layered medium synthetic seismograms using both COMRAD and a code
which computes the complete wavefield by the discrete wavenumber method.
The seismograms are compared according to a time-frequency misfit criteria
based on the continuous wavelet transform of the signals. The comparison
shows that the ray-theory seismogram is enough complete and moreover, the
time for the computing of the synthetics using the COMRAD code (truncating the ray series at the 10th generation) is 3-4-fold less than that needed for the
Axitra code (to a frequency of 25 Hz).
Description:
I.N.G.V.
Description:
Published
Description:
1.4. TTC - Sorveglianza sismologica delle aree vulcaniche attive
Description:
open
Keywords:
seismic phases
;
Axitra code
;
04. Solid Earth::04.06. Seismology::04.06.10. Instruments and techniques
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
report
