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The 2023 Turkey Earthquake sequence involved unexpected ruptures acrossnumerous fault segments, challenging data interpretation efforts. We presentrapid, 3D dynamic rupture simulations to illuminate the complexities of the$M_W$7.8 and $M_W$7.7 earthquake doublet. Constrained by observations availablewithin days of the sequence, our models deliver timely, mechanically consistentexplanations for the unforeseen rupture paths, diverse rupture speeds, multipleslip episodes, locally strong shaking, and fault system interactions. Wereconcile regional seismo-tectonics, rupture dynamics, and ground motions of afault system represented by ten curved dipping segments and a heterogeneousstress field. Our simulations link both events matching geodetic and seismicobservations. The $M_W$7.8 earthquake features delayed backward branching froma steeply intersecting splay fault, not requiring supershear speeds. Theasymmetrical dynamics of the distinct, bilateral $M_W$7.7 event is explained byheterogeneous fault strength, prestress orientation, fracture energy, andstatic stress changes from the previous event. Our models explain the northwarddeviation of its western rupture and the minimal slip observed on the S\"urg\"ufault. Rapidly developed 3D dynamic rupture scenarios can elucidate unexpectedobservations shortly after major earthquakes, providing timely insights fordata-driven analysis and hazard assessment toward a comprehensive, physicallyconsistent understanding of the mechanics of multi-fault systems.

Rapid 3D dynamic rupture modeling of the February 6, 2023, Kahramanmara\c{s}, Turkey, $M_W$7.8 and $M_W$7.7 earthquake doublet