There is a complex interaction 
between earthquakes and 
volcanic eruptions. Currently, 
swarms of small earthquakes can 
be used to predict the possibility 
of a major eruption. In general,
earthquake prediction is very 
difficult. Good news here - no 
volcanic threats around the Sea of 
Marmara or generally along 
Turkish coasts. Some of the 
earliest Turkish art and pottery 
depicts eruptions of Hasan Dagi. 
For the moment, we'll assume 
nothing like Toba, Tomba or 
Krakatoa will impact Turkey in 
the immediate future.
There are no appreciable tides in 
the Dardanelles, Sea of Marmara, 
Black Sea or the Bosphorus. 
There are some nasty currents.