Cops searching for a teen who vanished 10 years ago are excavating a nearby house after a radar detected “anomalies” underground, authorities said this week.

The major dig at a house in South Elgin, Illinois, started early Thursday — exactly 10 years and a day after Kianna Galvin, then 17, was last seen, having told her sister she was heading to a park on Mother’s Day.

“The excavation is being conducted after investigators scanned the property with ground-penetrating radar,” the Kane County State’s Attorney’s Office announced of the property just a few blocks from where Galvin lived.

Kianna Galvin vanished when she was 17 in May 2016 and hasn’t been seen since.…