Deep structural heterogeneities and the tectonic evolution of the Abruzzi region (Central Apennines, Italy) revealed by microseismicity, seismic tomography, and teleseismic receiver functions

摘要: Abstract The crustal structure of central Apennines (Italy) is still poorly defined, leaving uncertainties on the tectonic style (thin or thick-skinned) responsible for development thrust-and-fold belt. today active extension, which replaced compression since early Quaternary, presumably influenced by pre-existing that yields location and segmentation fault system. To focus such issues, we computed P- S-wave velocity models crust using independent methodologies local earthquakes tomography teleseismic receiver function. We document strong lateral vertical heterogeneities define shallow, imbricate sheets Mesozoic cover overlay exceptionally high Vp Vs bodies. These bodies can be interpreted as either dolomitic or, partially hydrated, mafic rocks. two alternative interpretations respectively imply an ultra-thick deposition rocks in hanging wall Triassic normal a deep exhumation Pre-Mesozoic basement during sin-rift tectonic. In both cases, these evolution Very remarkably, faults, like those ruptured ongoing 2009 L'Aquila sequence, concentrate at border bodies, suggesting they have role rheological behavior weak strong, uncertain, but utmost importance to understand risk future faulting earthquakes.