Figure 4

Circular rupture model. (a) Logarithm of the source radius, and (b) Stress-drop of the individual events versus the estimated seismic moment using the LPDT method. The theoretical scaling assuming four constant stress drop values of 0.01 MPa (black dotted line), 0.1 MPa (black dashed line), 1 MPa (black long-dashed line), and 10 MPa (black solid line) are presented as well. (c) Histogram of the stress-drop values. (d, e) Plot show the dependency of the stress-drop values to the depth and the average P-wave constant quality factor of the area, respectively. (f) Average stress-drop and a 95% confidence interval for each individual Q value. Panels a and b include the measurements by Zollo et al.²⁷ for Japan and Italy. Panels b and d include solution of the stress drop value for the Ezgeleh earthquake assuming Haskell model, shown with dark grey rectangle.