в отличие от eruption - сыпь. Возможно также "выброс", "горсть", "очередь" (не только автоматная), "серия", "россыпь" и т. п.
Это если речь о чем-то вроде:

Advice
... “Thank goodness he doesn't expect much from Gryffindors,” he said. “I can hardly keep up as it is!” This caused an erupment of giggles from Erin. ...
www.dentedshadows.com/audrey/SG/Aurora25.htm

Но есть еще и такое:

Magical creatures
... Erumpent. The Erupment is a grey, huge, African animal creature with enormous strength. It weighs up to a ton and could be taken for a rhinoceros. ...
www.evhermine.de/mg-s4xE.htm

Animaux fantastiques et Moldus - [ Translate this page ]
... Г©norme et rГ©pugnant' (AF/23). Dugbog (Fangieux). Erkling. Erupment (Eruptif). Farfadet. (2/125). Fee. Elles ont une apparence humanoГ®de ...
kedavra.free.fr/Animaux%20creatures.htm

Zoo
... Erkling, XXXX, An elfish creature, larger than a gnome with a unique high pitched cackle. Erupment, XXXX, A large, grey, African beast of great power. ...
www.geocities.com/karla_olmos/zoo.htm

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Извините за попытку дезинформации. Зато:

[PDF] Phaeoseptoria peltigerae sp. nov. associated with the lichen ...
File Format: PDF/Adobe Acrobat
... Conidiomata pycnidial, immersed, becoming partially erumpent, subglobose, 128–160 ...
Eidsvoll Municipality, Bruserud, on thallus of Peltigera horizontalis, 14 ...
journals.cambridge.org/article_S0953756296008891

Особого русского термина нет, правильно ответил danya. Можно еще \"проникающий\", если это, например, через поверхность воды, когда усилий для \"пробивания\" не требуется. .