Postseismic deformation following the 1997 Umbria-Marche (Italy) moderate normal faulting earthquakes

Details Postseismic deformation following the 1997 Umbria-Marche (Italy) moderate normal faulting earthquakes Postseismic deformation following the 1997 Umbria-Marche (Italy) moderate normal faulting earthquakes

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30g..43a&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 7, pp. 43-1, CiteID 1390, DOI 10.1029/2002GL016339

Physics

5

Geodesy And Gravity: Space Geodetic Surveys, Seismology: Continental Crust (1242), Seismology: Earthquake Dynamics And Mechanics, Tectonophysics: Continental Tectonics-Extensional (0905), Tectonophysics: Rheology-Crust And Lithosphere

Scientific paper

We combine aftershock strain mapping, GPS measurements and leveling profiles with forward modeling of viscoelastic relaxation to study the postseismic deformation of the 1997 Umbria-Marche (Central Apennines) earthquake sequence. We explore the feasibility of GPS monitoring of postseismic transients, for the first time in Italy, generated by shallow and moderate sources. Our data allow us to distinguish a preferred coseismic faulting model as well as insight into the rheology of the Central Apennines Earth's crust. The faulting model requires a listric geometry with most of the energy released in the lower half part of the elastic crust. The rheological model consists of an elastic thin upper crust, a transition zone of about 1018 Pa s underlain by a low-viscosity lower crust, ranging from 1017 to 1018 Pa s. The postseismic deformation is, both distributed in the transition zone - lower crust and confined to the fault zone.

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