Incollection,
Seismic scatterer imaging using shot array beamforming: method and application to the Campi Flegrei caldera
Conception, verification, and application of innovative techniques to study active volcanoes, Doppiavoce, Napoli, Italy, (April 2008)
Abstract
The shallow crustal structure of the Campi Flegrei caldera, southern
Italy, is imaged with P-to-P scattered seismic waves. The imaging
(migration) method is based on array beamforming and coherence analysis
of the scattered phase. Airgun shots from a controlled-source seismic
experiment are grouped into arrays, and a 1-D background velocity
model is used to calculate travel times for potential scatterer locations
on a regular grid in the image volume. A high coherence measured
on aligned traces indicates the presence of a scatterer at the corresponding
location. A stack of the individual images from several pairs of
a shot array and a single receiver provides the final image. First
results show a prominent region of seismic scattering that coincides
with the buried caldera rim.
