GNGTS 2023 - Atti del 41° Convegno Nazionale

Session 2.1 GNGTS 2023 3.2 Displacement on DRs by ranking Fig. 3 shows the vertical displacement (throw) on DRs plotted against the distance from PF, the magnitude of the event, and the mean vertical displacement on the PF. We analysed the vertical component of displacement, because in the database this is the measure most often available for dip-slip earthquakes. Therefore, throw values form a wider and more complete population of slip data. To analyse the possible relations between displacement on DRs and displacement on PF, we plotted the DR throw against a mean PF throw that depends on the position of the DR point considered. The mean PF throw is calculated as the average of the PF slip profile contained in a circle centred on a point located on the PF trace, the closest to the DR point considered. The circle radius is the semi-distance between the DR point and PF. Therefore, the mean PF throw depends on the position of the DR point along- and across-strike the PF. DR points close to PF are compared with more local values of the displacement on the PF compared to more distant points. The displacement for distributed faulting is analysed considering separately simple (rank 2) and complex (ranks 1.5, 3, 21 and 22) DRs. Fig. 3. Vertical displacement (throw) on DRs by ranking plotted against distance from PF (top), Mw (middle) and mean throw on PF (bottom) for normal (a) and reverse (b) earthquakes. See text for definition of mean throw on PF.