• THE RECENT SEISMICITY AT THE ALP-DINARIDES JUNCTION
  • Delise, Andrea

Subject

  • junction alp-dinarides
  • seismology
  • bovec
  • reflectivity
  • GEOFISICA DELLA LITOSFERA E GEODINAMICA

Description

  • 2005/2006
  • The aim of this Phd thesis is to get an insight on recent active seismic events occurring in the area of the Alps-Dinarides junction. This area is tectonically active in the greater scenario of the collision between the Eurasian plate and the African one, particularly the Adria microplate. In this study we have adapted the reflectivity method package developed for applied geophysics purpose to obtain synthetic seismograms related to earthquake signals, in particular for what it concerns the extended source modelling, and we have applied it to study the Friuli area events. In particular, to validate the method, we have performed both the direct modelling of the 2002 Carnia event, obtaining for it a 2km x 2km fault area, and calculated a scenario for the Friuli 1976 event, which turns to be compatible in its pattern with the observed macroseismic intensity felt. In the second part we have performed a JHD relocation for the 2004 Bovec sequence, comparing the aftershock relocations with those related to the 1998 sequence. We have observed that the 1998 rupture continued towards NW during the 2004 event. This is in agreement with the post event Coulomb's stress distribution, obtained by modelling the 1998 Bovec event. From the Coulomb stress modelling we recognize also a general increase of stress to the West and to the East of Bovec epicentral area. At last we have performed a waveform source parameter inversion for four events in the Friuli area and eleven events in the Western Slovenia area (magnitude mainly M>3.5), finding fault plane solutions in agreement with both the North-South directed stress field and the geometry of faults in each of the areas.

Date

  • 2007-05-29T09:23:58Z
  • 2007-05-29T09:23:58Z
  • 2007-05-29T09:23:58Z

Type

  • Doctoral Thesis

Format

  • 26254 bytes
  • 2748977 bytes
  • application/pdf
  • application/pdf
  • application/pdf
  • application/pdf

Identifier

http://hdl.handle.net/10077/2525

urn:nbn:it:units-3936