Magnitude 6.7 - NEGROS - CEBU REGION, PHILIPPINES
2012 February 06 03:49:16 UTC
- This event has been reviewed by a seismologist.
|Depth||11 km (6.8 miles) (poorly constrained)|
|Region||NEGROS - CEBU REGION, PHILIPPINES|
|Distances||72 km (44 miles) N of Dumaguete, Negros, Philippines|
74 km (45 miles) WNW of Tagbilaran, Bohol, Philippines
80 km (49 miles) WSW of Cebu, Cebu, Philippines
569 km (353 miles) SSE of MANILA, Philippines
|Location Uncertainty||horizontal +/- 13.5 km (8.4 miles); depth +/- 11.5 km (7.1 miles)|
|Parameters||NST= 72, Nph= 75, Dmin=744.7 km, Rmss=1.03 sec, Gp= 43°,|
M-type=regional moment magnitude (Mw), Version=8
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At least 51 people killed, 62 missing, 112 injured, 23,000 displaced, about 15,000 buildings destroyed or damaged, at least 17 bridges and many roads destroyed or damaged and utilities disrupted on Negros. Many landslides occurred including two that buried 30 homes at Guihulngan and 100 homes at La Libertad. Large waves reported at La Libertad. Some buildings damaged and landslides on Cebu and utilities disrupted at Iloilo, Panay. Estimated 15 million US dollars damage on Negros and Cebu. Felt (VII PIVS) at Dumaguete, Guihulngan, Tayasan and Vallehermoso; (VI PIVS) at La Carlota, La Castellana, Manjuyod and Tanjay, Negros. Felt (VI PIVS) at Argao, Barili, Bohol, Cebu, Clarin and Dalaguete and (VI) at Moalboal, Cebu. Felt throughout the Visayan Islands and as far as Manila, Luzon and Davao, Mindanao.
The broad-scale tectonics of the Philippine Islands are dominated by the west-northwest convergence of the Philippine Sea plate with respect to the Sunda plate. This motion, about 10 cm/year at the latitude of the earthquake of February 6, 2012, is accommodated by subduction along the east and west sides of the Philippines Archipelago and by motion of microplates and distributed deformation within the Archipelago. The February 6 earthquake occurred as thrust-faulting within the archipelago. Several earthquakes similar in size to the February 6 earthquake occurred within the archipelago in eastern Negros, Cebu, and Bohol in the twentieth century. In 1948 a magnitude 8.1 earthquake occurred about 150 km to the west of the February 6 earthquake in a zone of shallow seismicity that is associated with subduction along the Negros Trench on west side of the Philippines Archipelago.
- Preliminary Earthquake Report
- U.S. Geological Survey, National Earthquake Information Center:
World Data Center for Seismology, Denver