volcanicity

基本解释

The city was slain by the volcanicity.
被火山活动毁灭的城市。
chazidian.com
Volcanicity supplies material condition, migration pathway and migration agent for generation of inorganic CO2, So volcanic gas reservoir is often rich in CO2.
火山岩气藏普遍高含CO2的原因是：火山岩活动为无机CO2的生成提供了物质条件、运移通道和运移动力；
lib.swpu.edu.cn
The rifting magmatic action is mostly bimodal volcanicity in volcanic grabens located at both sides of the CSTZ formed and the synchronous magmatic irruption is also bimodal posture .
裂谷岩浆活动主要为两侧火山地堑发育的双峰式火山活动，同期的岩浆侵入活动也呈双峰态势。