part of synaptic vesicle exocytosis positive regulation of synaptic vesicle fusion to presynaptic active zone membrane calcium-dependent activation of synaptic vesicle fusion The regulatory process by which increased cytosolic calcium levels lead to the the fusion of synaptic vesicles with the presynaptic active zone membrane by bringing primed synaptic vesicle membrane into contact with membrane presynaptic active zone membrane. GO:0099502 biological_process