Open AccessTeleseismic P-residual study in the Italian region - inferences on large scale anisotropic structure of the subcrustal lithosphere
Author(s) -
Jaroslava Plomerová,
Vladislav Babuška,
Roberto Mario Scarpa
Publication year - 1998
Publication title -
annals of geophysics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.394
H-Index - 60
eISSN - 2037-416X
pISSN - 1593-5213
DOI - 10.4401/ag-3791
Subject(s) - lithosphere , geology , anisotropy , azimuth , residual , mantle (geology) , seismology , spatial distribution , geodesy , collision , geophysics , geometry , physics , remote sensing , tectonics , optics , mathematics , computer security , algorithm , computer science
Jeffreys-Bullen (absolute) and relative P-wave travel-time residuals were analyzed over Italy and its surrounding using P arrival times from the ISC bulletins supplemented by the data from local observatories. We analyzed the travel-time station corrections by two independent methods to obtain information on lateral variations of the velocity structure over the area and a view of possible upper mantle anisotropy. In the first method, the station corrections are computed as a constant and two cosine terms with appropriate phase shifts. Besides a static term, the second method allows us to study the relative residuals in dependence both on azimuths and incidence angles and thus to investigate their spatial variations and to map lateral variations of anisotropic structure of the subcrustal lithosphere. The high and low-velocity directions inferred from the spatial distribution of the relative residuals as well as the high- and low-velocity upper mantle heterogeneities reflect the geodynamic development of the region, governed by the collision between the African and Eurasian plate