Dike Propagation: Magma's Path to the Surface (2D)

Most magma generated in the mantle never becomes an eruption — it freezes underground as an intrusion. This 2D companion to the 3D dike model keeps the same two-stage magnitude physics — nucleation limited by fracture toughness, ascent limited by buoyancy — but makes the direction of propagation an explicit, editable stress field instead of a straight vertical line. Set a regional stress trend and its magnitude, then click inside the crust to drop magma-chamber stress sources: each one locally rotates the stress tensor, and because a real dike always propagates perpendicular to the local minimum compressive stress, the crack visibly bends to trace around what you've placed — deflecting past a source, curving toward a gap between two of them, or arresting mid-crust when the buoyancy budget runs out first.