noun
volcanic earthquake
A technical term in seismology and volcanology referring to earthquakes caused by volcanic activity, such as magma movement or eruptions.
火山性地震の回数が増えると、噴火の前兆かもしれない。
When the number of volcanic earthquakes increases, it may be a sign of an impending eruption.
Compound of 火山 (kazan, 'volcano') + 性 (sei, '-ic, -like') + 地震 (jishin, 'earthquake').