1. in a manner characterized by sudden, violent, or forceful entry or eruption
Usage: formal; often used in geological or scientific contexts

Examples

• The magma rose irruptively through the fractured crust.
• The population expanded irruptively after the introduction of new resources.
• The storm arrived irruptively, with little warning.
• Gases escaped irruptively from the volcanic vent.
• The species spread irruptively across the newly available habitat.