Quake 5.1 Richter shank Luzon, Philippines

August 7th, 2008 - 3:27 pm ICT by Bupha Ravirot  

An earthquake measuring 5.1 on the Richter scale shook parts of Philippines, Luzon on Thursday, but there were no immediate reports of damage or casualties.

The quake struck at about 06:03:27 UTC (02:03:27 PM PHT) with its epicenter about 20 km SE from Angeles, Luzon, 45 km ENE of Olongapo of Luzon, 55 km NW from Mnila, 60 km SSW from Cabanatuan, Luzon, Philippines, reported by U.S. Geological Survey.

Lying on the northwestern fringes of the Pacific Ring of Fire, the Philippines experiences frequent seismic and volcanic activities. Some 20 earthquakes are registered daily in the Philippines, though most are too weak to be felt. The last great earthquake was the 1990 Luzon earthquake.

The 1990 Luzon earthquake occurred on Monday, July 16, 1990, at 4:26 PM local time in the Philippines. The densely populated island of Luzon was struck by an earthquake with a 7.8 Ms (surface-wave magnitude). The earthquake produced a 125 km-long ground rupture that stretched from Dingalan, Aurora to Kayapa, Nueva Vizcaya as a result of strike-slip movements along the Philippine Fault Zone and the Digdig Fault. The earthquake epicenter was placed at 15º 42′ N and 121º 7′ E near the town of Rizal, Nueva Ecija, northeast of Cabanatuan City.

The earthquake caused damage in an area of about 20,000 square kilometers, from northwest of Manila through the Central Luzon and into the mountains of the Cordillera Administrative Region. About 1,600 people were killed, mostly in the central Luzon and Cordillera region. This was one of the deadliest and costliest natural disasters in the Philippines.

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