<p>Axial Seamount, located at the intersection of the Juan de Fuca Ridge and the Cobb hotspot in the NE Pacific, is one of the most active submarine volcanoes on Earth and a key site for studying eruption dynamics and forecasting. Its 2015 eruption was captured in real time by the Ocean Observatories Initiative (OOI) Regional Cabled Array (RCA), enabling continuous monitoring of surface deformation and seismicity in and around the summit caldera during the event. Data from seismometers and bottom pressure/tilt instruments recorded the initial phases of a dike that was injected southward beneath the northeastern caldera, which then stopped and propagated northward into the north rift zone. In this study, we model the early stages of this dike intrusion using Okada’s (1985) discrete rectangular dislocation formulation, constrained by tiltmeter data from two stations located at the caldera center and southeastern caldera margin. Time-dependent modeling of dike-induced tilt shows that a single southward-propagating dike can reproduce the tilt observed at the caldera center but could not reproduce both tilt records; incorporating a secondary dike is needed to fit the combined dataset. The preferred model configuration consists of two en-echelon, north-south-trending dikes: a primary dike propagating southward that intersects the eastern caldera wall obliquely and reaches the surface, and a secondary dike initiating under the southeast caldera rim that does not reach the surface and whose lateral propagation direction is ambiguous. These findings quantify the geometry and dynamics of the dike intrusion that initiated the 2015 eruption at Axial Seamount and underscore the importance of structural controls in shaping dike propagation paths within a ridge-hotspot volcanic system.</p>