This study is based on seismic information published by the United States Geological Survey (USGS) and analyzes 637 global earthquakes with moment magnitude M_W≥7.0 that occurred from 1980 to 2024. Through a comprehensive literature review, source parameter data were compiled for 165 of these events. Using the least-squares method, empirical relationships between moment magnitude and key seismic source parameters—including fault length (L), fault width (W), fault area (S), maximum slip (D_max), average slip (D), average rupture velocity (V_r), stress drop (Δ_σ), and rupture duration (T_R)—were established for different faulting mechanisms (normal, reverse, and strike-slip faults). The results demonstrate strong linear relationships between fault length, fault width, and fault area and moment magnitude across all three fault types. Maximum slip and average slip also show significant correlations with moment magnitude, with correlation coefficients ranging from 0.52 to 0.87. In contrast, the relationships between average rupture velocity and stress drop and moment magnitude are relatively weak. The correlation between rupture duration and moment magnitude is more pronounced for reverse and normal fault earthquakes, but less evident for strike-slip events. In addition, this study investigates the interrelationships among seismic source parameters. The results indicate that strike-slip earthquakes exhibit a larger length-to-width ratio, with an average value of 3.97, whereas reverse and normal fault earthquakes show smaller ratios, averaging 2.05 and 2.43, respectively. The ratio of maximum slip to average slip is predominantly distributed between 1.5 and 3.5, with a mean value of 3.18, reflecting significant heterogeneity in slip distribution during the rupture process. Furthermore, both stress drop and average rupture velocity display limited dependence on source depth. These findings provide important constraints on the scaling behavior and rupture characteristics of large earthquakes worldwide.