India, July 30 -- Several countries are under tsunami threat after a powerful 8.7-magnitude earthquake struck Russia's Kamchatka Peninsula. Tsunami waves have already reached parts of Russia's Kuril Islands and Japan's northern island of Hokkaido.

Here is the complete list of countries and islands where tsunami waves could strike, as per US tsunami warning system.

Ecuador

Russia

Northwestern Hawaiian Islands

Chile

Costa Rica

French Polynesia

Guam

Hawaii

Japan

Jarvis Island

Johnston Atoll

Kiribati

Midway Island

Palmyra Island

Peru

Samoa

Solomon Islands

Antarctica

Australia

Chuuk

Colombia

Cook Islands

El Salvador

Fiji

Guatemala

Howland and Baker Islands

Indonesia

Kermadec Islands

Kosrae

Marshall Islands

Mexic...