Philippine Trench, E of Leyte Is., 7.6Mw, 31/08/2012

A Very-Strong 7.6Mw earthquake has occurred in the Philippine Trench, located by the Philippine Institute of Volcanology and Seismology, Seismic Monitoring Network 112km SE of Guiuan (Eastern Samar).
Date/Time UTC: 31/08/2012 12:47:34.58
Philippine Standard Time (PST): 31/08/2012 20:47:00
Lat: 10.839 Long: 126.704
Total Energy Released= 3,787,985.642 TTNT

A house collapsed via a landslide in Southern Cagayan de Oro city on the South Island of Mindanao killing a 54-year-old woman and injuring her 5-year old grandson.[]

In the interactive maps below click on Icon for event details.
To view a larger map and list (in decending order of occurance), click on text “View Larger Map” below map.

Aftershock map – 72 Hours – PHIVOLCS data


gfz moment tensor solution


72 hours after the main shock
mag2= 0, mag3= 6, mag4= 13
mag5= 2 , mag6= 3, mag7= 1(mainshock)
total= 57 (incl. main shock)
total energy released= 4,135,053.842 TTNT

Other Magnitude Estimates:
mb 7.4 [ras] Mw 7.6 [gcmt] Ms 7.5 [ras] mb 7.2 [ugs]
Deaths: 1 Injuries: 1


Burgos, Sapao, Alegria, Cagosoan Pt, Homonhon, Libertad, Pilar, Caridad, San Isidro, Beilon, Philippines=1.1m;
Baras, Guiuan, San Benito, General Luna=1.0m
Sang-an, Bobon, Mercedes, Dapa, Salcedo, Asgad, Lusod, Santa Margarita=0.9m; Matarinao=0.7m;
Palau=0.2-0.3m; Taiwan=0.1m; Japan=0.1m [gdacs]

Reported MM Intensity

Reported Felt as; [phovolcs]
MM VII – Guiuan, Oras, Sulat, Borongan City, Eastern Samar; Tacloban City
MM VI – Siargao, Surigao del Norte; Saint Bernard, S. Leyte

MM V – Mati City; Compostela; Legaspi City; Iloilo City; Bislig City, Iligan City; Davao City; Cateel Davao Oriental ; Roxas City, Capiz
MM IV – Butuan City, Catbalogan City, Cagayan De Oro City; Dipolog City; Manukan, ZN; Polanco, ZN; Tagum, Davao del N., Digos City;Dumaguete City; Bacolod City

MM III – Cotabato City, Mambajao, Camiguin, General Santos City; Dao, Capiz, Dingle, Iloilo; Kidapawan City; Jaro, Iloilo; Daet, Cam. Norte; Binalbagan Neg. Occ.; Sindanga, Zamboanga del Norte

MM II – Marawi City, Sipalay City, Hinigaran, La Carlota La Granja, Neg. Occ., Cebu City

Network Plots

Network estimates of the location of the main shock
PHIVOLCS= Philippine Institute of Volcanology and Seismology
RAS= Russian Academy of Sciences
EMSC= European Mediterranean Seismological Centre
GFZ= GEOFON Program, Potsdam, Germany
UGS= United States Geological Survey
GCMT= Global Centroid-Moment-Tensor Project

History 1619-2012 (Utsu and ANSS)

Data from Utsu’s “Catalog of Damaging Earthquakes in the World,” for the period 1619 to 2003 magnitude 6+ historical events centred on todays event and the Advanced National Seismic System catalog hosted by the Northern California Earthquake Data Center historical events within a 100km radius of todays eventfor the period 1963 to 2012 magnitude 5+[98 events]
Todays event marked at the PHIVOLCS location.

Timeline Graph

72 hour Aftershock Timeline Graph ( magnitude versus time) for the Philippine Trench, E of Leyte Is., 7.6Mw, 31/08/2012 earthquake based on data from the Philippine Institute of Volcanology and Seismology, Seismic Monitoring Network PHIVOLCS
72 hour Philippine Trench, E of Leyte Is., 7.6Mw Aftershocks Graph

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