# Detonate a 150 Kilotons nuclear bomb 77M underground

If I detonate a 150 Kilotons nuclear bomb 77M underground what would be the radius of the E.M.P. effect above ground ? If the nature of the soil change the result than give me a couple of soil example like rock, granite, etc... I was assuming that there would be no E.M.P. effect or very short distance effect but someone is arguing with me there would be one so tell me the truth !