Magnitude 6.1 earthquake struck Luzon, Philippines

magnitude-6-1-earthquake-struck-luzon-philippines

Strong earthquake with magnitude 6.1 struck Luzon, Philippines on June 16, 2012 at 22:18 UTC according to USGS. Epicenter was located 94 km (58 miles) SW of Dagupan, Luzon, Philippines (15.574°N, 119.609°E). Recorded depth was 35.3 km (21.9 miles).

Philippine Institute of Volcanology and Seismology  – PHIVOLCS is reporting 6.0 earthquake. No damage is expected from this one. Aftershocks are expected.

Magnitude 6.1
Date-Time
  • Saturday, June 16, 2012 at 22:18:48 UTC
  • Sunday, June 17, 2012 at 06:18:48 AM at epicenter
Location 15.574°N, 119.609°E
Depth 35.3 km (21.9 miles)
Region LUZON, PHILIPPINES
Distances 94 km (58 miles) SW of Dagupan, Luzon, Philippines
109 km (67 miles) NW of Olongapo, Luzon, Philippines
115 km (71 miles) WNW of Angeles, Luzon, Philippines
182 km (113 miles) NW of MANILA, Philippines
Location Uncertainty horizontal +/- 11.1 km (6.9 miles); depth +/- 6.6 km (4.1 miles)
Parameters NST=294, Nph=299, Dmin=817.1 km, Rmss=0.96 sec, Gp= 22°,
M-type=regional moment magnitude (Mw), Version=B
Source
  • Magnitude: USGS NEIC (WDCS-D)
    Location: USGS NEIC (WDCS-D)
Event ID usb000ahkr

 

Shake map

Population exposure

Selected cities exposed from GeoNames database of cities with 1,000 or more residents.

MMI City Population
IV Bani 3k
IV Bolitoc 3k
IV Lipay 3k
IV Taltal 5k
IV Palauig 3k
IV Lucapon 6k
III Manila 10,445k
III Makati 0
III Pasig 0
III Tabuk 27k
III Kabugao 2k

Historical seismicity – 2012

This area is on the Manila Trenchan oceanic trench in the South China Sea, located west of the islands of Luzon and Mindoro in the Philippines. The trench reaches a depth of about 5,400 metres (17,700 ft), in contrast with the average depth of the South China Sea of about 1,500 metres (4,900 ft). It is created by subduction, in which the Sunda Plate (part of Eurasian Plate) is subducting under the Philippine Mobile Belt, producing this almost N-S trending trench. Theconvergent boundary is terminated to the north by the Taiwan collision zone, and to the south by the Mindoro terrane (Sulu-Palawan block colliding with SW Luzon). It is an area pervaded by negative gravity anomalies.

The Manila Trench is associated with frequent earthquakes, and the subduction zone is responsible for the belt of volcanoes on the west side of the Philippine island of Luzon, which includes Mount Pinatubo.

Convergence between the Philippine Mobile Belt and the Sunda Plate have been estimated using GPS measurements, and this value ranges from ~ 50+ mm/yr in Taiwan, to 100 mm/yr near N. Luzon, and ~ 50 mm/yr near Zambales and ~20+mm/yr near Mindoro island. Plate locking between the Sunda Plate and Luzon is about 1% coupled, almost unlocked as determined by elastic block models, suggesting that the trench absorbs the Philippine Mobile Belt-Eurasian Plate convergence.

Featured image: Google Earth + USGS

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