Croatia_M6.4_dCFF_fault parallel

Map with blue and red shapes, identifying areas of decreased and increased stress respectively. Black circles show aftershock locations. Green lines show fault locations.

Stress calculation using Coulomb 3.4 (Toda et al, 2011). Guided by the Seismological Survey of Croatia aftershocks and the U.S. Geological Survey (USGS) mainshock ‘moment tensor’ (which gives the geometry, sense of slip, and energy release), we assume a 24-kilometer-long by 10-kilometer-wide fault dipping 76° to the southwest, with 0.6 meters of right-lateral and 0.01 meter of reverse slip, with its upper edge buried 2.6 kilometers below the surface. The diversity of aftershock focal mechanisms means our source model is likely over-simplified.

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