GeoSeries.
buffer
Returns a GeoSeries of geometries representing all points within a given distance of each geometric object.
GeoSeries
See http://shapely.readthedocs.io/en/latest/manual.html#object.buffer for details.
The radius of the buffer. If np.array or pd.Series are used then it must have same length as the GeoSeries.
Optional, the resolution of the buffer around each vertex.