Oct 17 (Reuters) - A magnitude 6.1 earthquake struck Mindanao, Philippines on Friday, the German Research Centre for Geosciences (GZF) said. (Reporting by Ruchika Khanna in Bengaluru; Editing by Jacqueline Wong) (The article has been published through a syndicated feed. Except for the headline, the content has been published verbatim. Liability lies with original publisher.)