A strong 7.8 earthquake has struck Ecuador's coastline, triggering a possible tsunami wave warning along some 300 miles of the coasts of both Ecuador and Colombia. The Pacific Tsunami Warning Center forecast waves of up to one meter above the tide level. Initially reported as 7.4 by USGS, the earthquake was centered at a shallow depth of 10 km (6 miles) some 107 miles (173 km) west northwest of the capital Quito. "Hazardous tsunami waves from this earthquake are possible within 300 km of the epicenter along the coasts of Ecuador and Colombia," PTWC said. UPDATE: Widespread destruction has been reported around the epicenter of the massive 7.8 quake that hit Ecuador coast on Saturday night. An alert about a possible tsunami wave has also been issued. 02:46 GMT 02:43 GMT The Pacific Tsunami Warning Center said that potential wave amplitudes on Ecuador's coast "may vary from forecast amplitudes due to uncertainties in the forecast and local features." "In particular maximum tsunami