Central Philippines earthquake, February 06, 2012

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Presentation transcript:

Central Philippines earthquake, February 06, 2012 Md. Nurul Alam, Senior Structural Engineer, ADPC

Earthquake Details Magnitude: 6.7 Monday, February 06, 2012 at 11:49:16 AM at epicenter Location: 9.964°N, 123.246°E 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 (Source: USGS)

Philippines in the Pacific Ring of Fire http://en.wikipilipinas.org

Tectonic Summary 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 micro plates 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. (Source: USGS)

Location (Source: USGS)

Pager Alert (Source: USGS)

Effects At least 48 people killed, 92 missing, 100 injured, many buildings damaged or destroyed and at least 11 bridges damaged by the earthquake and earthquake-triggered landslides in Negros Oriental. (Source: USGS)

Aftermath of quake in Philippines http://www.seattlepi.com

Philippines earthquake toll rises as dig continues for landslide casualties http://www.guardian.co.uk Rescuers have found no further survivors among dozens of people buried by landslides on a central Philippine island after an earthquake. The death toll has climbed to 15, with more than 70 people missing.

Tsunami Information The earthquake locations and magnitudes cited in NOAA tsunami statements and bulletins are preliminary and are superseded by USGS locations and magnitudes computed using more extensive data sets. (Source: USGS)