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GeoGeoGeoGeo OP t1_iyo1hxi wrote

People have drilled directly into magma before (Hawaii in 2007? & Iceland 2009), and there has been no eruption for a couple of reasons:

(1) drill holes are too narrow to transmit the explosive force of a volcanic eruption. (It’s the equivalent of piercing a champagne cork with a pin rather than removing the entire cork at once.)

(2) Due to the small diameter of drill holes (typically <10 cm), the small amount of magma that could flow into the shaft would solidify long before reaching the surface

See Iceland Deep Drilling Project:The first well, IDDP-1, drilled into Magma for more information.

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