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Moro Gulf, Mindanao, Philippines: 1976 Moro Gulf earthquake: Earthquake: On 17 August 1976 at 00:11, a magnitude 7.9 earthquake struck the island of Mindanao, Philippines. The resulting tsunami devastated more than 700 km (430 mi) of coastline bordering the Gulf of Moro in the North Celebes Sea. Estimated casualties included 5,000 dead, 2,200 ...
Tsunami damage at Barangay Tibpuan, Lebak, Mindanao. Several fault zones in the region are capable of producing major earthquakes and destructive local tsunamis. The two major fault zones that are most dangerous are the Sulu Trench in the Sulu Sea and the Cotabato Trench, a region of subduction that crosses the Celebes Sea and the Moro Gulf in Southern Mindanao.
Much of the Philippines lie within the area of strongly tectonised blocks of mainly island arc origin, known as the Philippine Mobile Belt. To the east, Philippine Sea plate is subducting beneath the mobile belt along the line of the Philippine Trench and the East Luzon Trench at the northern end of the belt.
This event in the southern Philippines triggered a large tsunami, with a maximum run-up of 7.2 m, [8] which affected the coasts of the Celebes Sea, causing widespread damage. The combined effects of the earthquake and the tsunami caused 52 casualties. With some sources stating that the tsunami alone caused up to 1,000 casualties.
The Pacific Tsunami Warning Center also said that they expected tsunami waves to be as high as 1–3 m (3.3–9.8 ft) in the Philippines, 0.3–1 m (0.98–3.28 ft) in Palau, and less than 0.3 m (0.98 ft) in American Samoa, China, South Korea, a majority of Polynesia, Melanesia and Micronesia, Hawaii, Indonesia, Japan, Taiwan and Malaysia. [16]
It has erupted 16 times since 1885 and is considered as the 4th most active volcano in the Philippines after Mayon, Taal, and Kanlaon. There are evacuation procedures in place for parts of the peninsula, the farms nearest the volcano are evacuated, and many of the village schools are closed if it is considered possible that a more destructive ...
The tsunami generated by the 1976 earthquake caused about 4,000 deaths on Mindanao. Modelling of likely further tsunamis along the Cotabato Trench suggests that run-ups of several metres are likely for future earthquakes similar in size to the 1976 event.
A tsunami warning was issued within eight minutes after the tremor for coastal regions of the Philippines, Indonesia, Taiwan, Guam, and Japan, as well as for the island nations of Palau, Yap, and Northern Mariana. A tsunami watch was at the time in effect for much of Micronesia, the Solomon Islands, Hawaii, and the Pacific coast of Russia.