The August 27, 1886 earthquake in Messenia (Peloponnesus) and reported flames over the Ionian Sea—a Mediterranean Ridge gas escape event?

The 1960 bathymetric map of Pfannenstiel showed a submarine volcano west of the Peloponnesus which could not be confirmed by modern bathymetric surveys. Pfannenstielʹs interpretation was supported by a report of flames on the sea in 1886. It is most likely that the strong earthquake on August 27, 1886, triggered a submarine mud volcano eruption and gas escapes on the Mediterranean Ridge (MR), and burning gas was observed from several places on land and on sea.