Question

how does a volcanic eruption cause tsunami
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Answer 1

Explanation:

According to this mechanism, waves may be generated by the sudden displacement of water caused by a volcanic explosion, by a volcano's slope failure, or more likely by a phreatomagmatic explosion and collapse/engulfment of the volcanic magmatic chambers

Answer 2

Dᴜʀɪɴɢ ᴇʀᴜᴘᴛɪᴏɴs, ᴠᴏʟᴄᴀɴɪᴄ ᴛsᴜɴᴀᴍɪs ᴄᴀɴ ʙᴇ ᴄᴀᴜsᴇᴅ ʙʏ ᴜɴᴅᴇʀᴡᴀᴛᴇʀ ᴇxᴘʟᴏsɪᴏɴs ᴀɴᴅ sʜᴏᴄᴋ ᴡᴀᴠᴇs ᴄᴀᴜsᴇᴅ ʙʏ ʟᴀʀɢᴇ ᴇxᴘʟᴏsɪᴏɴs - ᴇᴠᴇɴ ᴏɴᴇs ᴛʜᴀᴛ ᴏᴄᴄᴜʀ ᴀʙᴏᴠᴇ ᴛʜᴇ ᴡᴀᴛᴇʀʟɪɴᴇ. Sʜᴏᴄᴋ ᴡᴀᴠᴇs ᴄᴏᴜᴘʟɪɴɢ ᴡɪᴛʜ sᴇᴀ ᴡᴀᴠᴇs ᴄᴀɴ ᴘʀᴏᴅᴜᴄᴇ ᴛsᴜɴᴀᴍɪs ᴜᴘ ᴛᴏ ᴛʜʀᴇᴇ ᴍᴇᴛᴇʀs ɪɴ ʜᴇɪɢʜᴛ.