Did the query return anything in the columns LoginName or ApplicationName?  That would help pinpoint who or what is happening that caused the log to grow.  With the results you show here, you at least have the time the log file grew, but you still would need to match it up to what was executing then.  If it's a scheduled SQL Agent job, you would see something like this for ApplicationName:
SQLAgent - TSQL JobStep (Job 0x475A3D830555AE4F854CCB63761ED284 : Step 1)
And that job id can be matched to MSDB tables like this:
SELECT * FROM dbo.sysjobs
WHERE job_id = 0x475A3D830555AE4F854CCB63761ED284