Long-period events (LPs) are observed in active volcanoes, hydrothermal systems, and hydraulic fracturing. The prevailing model for LP events suggests that they result from pressure disturbances in fluid-filled cracks that generate slow, dispersive waves known as Krauklis waves. These waves oscillate within the crack, causing it to act as a seismic resonator whose far-field radiations are known as LP events. Since LP events are generated from fluid-filled cracks, they have been used to analyze fluid transport and fracturing in geological settings. Additionally, they are deemed precursors to volcanic eruptions. However, other mechanisms have been proposed to explain LP seismicity. Thus, a robust interpretation of LP events requires understanding all parameters contributing to LP seismicity. To achieve this, for the first time, we have developed a physical model to investigate LP seismicity under controlled-source conditions. The physical model consists of a 30 cm × 15 cm × 0.2 cm crack embedded within a concrete slab with dimensions of 3 m × 3 m × 0.24 m. Using this apparatus, we extensively investigate fundamental factors affecting LP signals, including crack stiffness, fluid viscosity, radiation patterns, and triggering location. Our findings are consistent with the theoretical model for Krauklis waves within a fluid-filled crack. For instance, a reduction in stiffness leads to an increase in resonance frequency, whereas an increase in fluid viscosity results in a decrease in resonance frequency. Thus, this physical model can offer new horizons in understanding LP seismicity and bridge the gap between theoretical models and observed LP signals.