  We study the formation of four coronal mass ejections (CMEs) originating from
homologous blowout jets. All of the blowout jets originated from NOAA active
region (AR) 11515 on 2012 July 2, within a time interval of $\approx$14 hr. All
of the CMEs were wide (angular widths $\approx$95$-$150$^\circ$), and
propagated with speeds ranging between $\approx$300$-$500 km s$^{-1}$ in LASCO
coronagraph images. Observations at various EUV wavelengths in Solar Dynamics
Observatory/Atmospheric Imaging Assembly images reveal that in all the cases,
the source region of the jets lies at the boundary of the leading part of AR
11515 that hosts a small filament before each event. Coronal magnetic field
modeling based on nonlinear force free extrapolations indicate that in each
case the filament is contained inside of a magnetic flux rope that remains
constrained by overlying compact loops. The southern footpoint of each filament
is rooted in the negative polarity region where the eruption onsets occur. This
negative-polarity region undergoes continuous flux changes, including emergence
and cancellation with opposite polarity in the vicinity of the flux rope, and
the EUV images reveal brightening episodes near the filament's southeastern
footpoint before each eruption. Therefore, these flux changes are likely the
cause of the subsequent eruptions. These four homologous eruptions originate
near adjacent feet of two large-scale loop systems connecting from that
positive-polarity part of the AR to two remote negative-polarity regions, and
result in large-scale consequences in the solar corona.
