- Yuzhno-Sakhalinsk Tsunami Warning Center ( Y S T W C ), Sakhalin isl. Russia Postal address: Chief - Tatyana N. Ivelskaya, Zapadnaya str, 78 Yuzno-Sakhalinsk, 693000 Russian Federation (CIS) Telephone numbers: 24 hr phone: +7-424-2 42-36-91 1st alternate: +7-424-2 72-28-20 2nd alternate: +7-424-22 5-31-14 E-mail address: TWC@Sakhalin.ru For the Russia, YSTWC has responsibility as National ...www.science.sakhalin.ru/Tsunami/Index.html