The obvious one is an immediate hike interest rates, but the due to the stubbornness of the wee fella someone would need big balls to implement that against his wishes, again! It's what Russia did a few years ago when the rouble went south and, along with other financial measures, slowed things down. That said, I don't think the rouble has really recovered to previous values.
I wouldn't like to speculate on what other measures the government/central bank may decide, if they do anything at all right now. They may simply try to ride it out.
Like Keith, I'm just glad we no longer have any assets in Turkey and got out at a decent (relatively speaking) rate. When we sold the apartment in Karagozler last year the deal was priced and sold in sterling.
The few hundred lira in my Finans account is our only casualty.
JF