Physics
Scientific paper
Apr 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007pepi..161...74s&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 161, Issue 1-2, p. 74-85.
Physics
2
Scientific paper
The adaptive mesh double-difference tomography algorithm (tomoADD) was applied to absolute and differential P, S and S P data to determine three dimensional VP, VS and VP/VS variations and event locations in southeastern Sicily (Italy). The obtained velocity images highlight vertical and lateral heterogeneities that can be associated with different geological units and main tectonic features. In particular, the sharp velocity contrasts are consistent with previously recognized active faults, allowing us to better determine their shapes and geometries at depth. Moreover, a striking correspondence between areas ruptured by earthquakes and velocity anomalies is observed. In fact, seismicity is mostly confined in the high velocity volumes and/or along the high low velocity boundaries at mid-crustal depths, whereas it tends to avoid regions with lower than average VP and VS values and higher VP/VS ratios.
Giampiccolo Elisabetta
Musumeci Carla
Patanè Domenico
Scarfi Luciano
Zhang Haijiang
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