Array Analysis of Seismograms from Explosive Sources: Evidence for Surface Waves Scattered at the Main Topographical Features

摘要: In this article, we analyze the seismic wavefield produced by blasts fired at Mt. Vesuvius for a deep sounding experiment and recorded dense short-period three-component array. Seismograms from five explosions occurring bottom of wells located different distances azimuth with respect to array site have been analyzed zero lag cross-correlation technique applied both vertical horizontal components in frequency range 3–7 Hz. The aim is portion seismograms long after first P onset order obtain slowness backazimuth distribution correlated secondary phases. Polarization analysis time domain, carried out using covariance matrix technique, has also well-correlated phases determine their wave composition. Results show that detected coda seismogram shots are composed almost entirely surface waves. Location scatterers shows high concentration around volcanic edifice Vesuvius, confirming topographical irregularities play an important role generation high-frequency scattering phenomena.