The following four figures demonstrate graphic outputs of ISOLA software. Figure S1 presents summary of the inversion results for the reference case (Case 1 of Figure 3), while Figure S2 presents the waveform fit plot for Case 2. Both plots are produced automatically by ISOLA and can be exported in various graphic formats. Figure S3 is simply the colored version of Figure 5 of the main text; color helps to visualize the space-time variability of the DC-percentage shown by color-coded beachballs. Figure S4 illustrates effects of the assumed velocity model.
Figure S1. The test event of April 25, 2012 (10:34 UTC; Mw 4.3, Lat 38.4045 °N Lon 21.9877 °E). Stations are marked by triangles. Broad-band instruments are used, except strong-motion accelerographs at SERG and TRIZ, where the broad-band records were clipped. The "beachball" plotted at the epicenter position, corresponds to the reference fault-plane solution, Case 1 of Figure 3. The figure is an example of the automatically generated summary output of ISOLA results. Exact explanation of all parameters is given in the text.
Figure S2. The waveform match for Case 2 of Figure 3. The observed and synthetic displacement waveforms are plotted by black and red lines respectively. The observed waveforms plotted in grey are those excluded from inversion due to various reasons (EFP due to clip, two components of ANX due to instrumental problem, the others due to noise). Each component has its variance reduction value marked in the plot by blue color.
Figure S3. Color version of Figure 5 of the main text. It helps to visualize the space-time variability of the DC-percentage, shown by color-coded beachballs in the correlation plot.
Figure S4. Comparison of the correlation plot for Case 2 of Figure 3 calculated in three alternative velocity models of the studied region (Novotny et al., 2001; Latorre et al., 2004; Rigo et al.,1996). The corresponding values of FMVAR and STVAR indices and the velocity distribution with depth for each model are included in the plot.
Latorre, D., Virieux, J.,Monfret, T.,Monteiller, V., Vanorio, T., Got, J.L., Lyon-Caen,H., 2004. A new seismic tomography of Aigion area (Gulf of Corinth, Greece) from the 1991 data set. Geophysical Journal International 159 (3), 1013-1031. doi:10.1111/j.1365- 246X.2004.02412.x.
Novotny O., Zahradnik J. and Tselentis G-A., 2001. Northwestern Turkey earthquakes and the crustal structure inferred from surface waves observed in western Greece. Bull. Seismol. Soc. Amer., 91, 875-879.
Rigo, A., Lyon-Caen, H., Armijo, R., Deschamps, A., Hatzfeld, D., Makropoulos, K., Papadimitriou, P., Kassaras, I., 1996. A microseismic study in the western part of the Gulf of Corinth (Greece): implications for large-scale normal faulting mechanisms. Geophysical Journal International 126 (3), 663-688.
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