Horizontal cracks like this are usually the result of the reinforcing steel too close to the outer edge of the forms.
When the forms are stripped, and if the conditions of the steel being hot on the day of the pour, a fine micro crack appears, concrete around the steel curing outwards meeting the normal curing of the concrete curing from the outside towards the middle.
Then with seismic activity or maybe foundation settlement, the foundation bends a little, causing the crack to open, most of the time exposing the steel to corrosion.
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