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One of the largest historical earthquake on the fault zone was the 1990 Luzon M s 7.8 event that left nearly 2,000 people dead or missing. The same part of the fault zone is thought to have ruptured in the 1645 Luzon earthquake . [ 7 ]
Reawakened in 1991 producing the 2nd largest eruption in the 20th century. Followed by milder eruptions in 1992 and 1993. [4] Mt. Kanlaon eruption: 1886 to 2024: The most active volcano in the Visayas, Kanlaon has erupted 26 times since 1919. Eruptions are typically phreatic explosions of small-to-moderate size that produce minor ash falls near ...
The 1990 Luzon earthquake occurred on July 16 at 4:26 p.m. or 3:26 p.m. on the densely populated island of Luzon in the Philippines.The shock had a surface-wave magnitude of 7.8 and produced a 125 km-long ground rupture that stretched from Dingalan, Aurora to Kayapa, Nueva Vizcaya.
Near the Cotabato Trench, two of the largest 20th century Philippine earthquakes: the 1918 Celebes Sea earthquake (8.3 M w) and the 1976 Moro Gulf earthquake (8.0 M w). Also included is the recent 2002 Mindanao earthquake (7.5 M w). The Moro Gulf, part of the Celebes Sea, is labeled for context.
The 2002 event (7.5 M w) occurred near the two largest 20th century Philippine earthquakes: the 1918 Celebes Sea earthquake (8.3 M w) and the 1976 Moro Gulf earthquake (8.0 M w). The epicenter of the earthquake was located near the Cotobato Trench; the magnitude of this megathrust earthquake was 7.5, the sixth strongest of the year. [ 2 ]
The earthquake struck at 8:18 PM [4] and had a surface wave magnitude of 6.5. [3] It was the most powerful earthquake to strike the Philippines in seven years. Shaking lasted 20 seconds and damaged seven towns extensively, [4] its greatest damage occurring near Pasuquin, Laoag, Sarrat, and Batac in the Ilocos Norte province.
The 1976 Moro Gulf earthquake and tsunami occurred on August 17, 1976, at 00:11 local time near the islands of Mindanao and Sulu, in the Philippines. It measured 8.0 on the moment magnitude scale occurring at a depth of 20 km (12 mi). [ 2 ]
Most earthquakes that occur along the Cotabato Trench displays a strike-slip mechanism, which may be that of the 1955 earthquake. [5] Multiple foreshocks preceded the mainshock, the largest measuring 6.3 occurred 6 hours earlier. It was first believed to be a double earthquake with the mainshock, however it was later confirmed to be a foreshock.