I. SITUATION OVERVIEW
At 10:03 PM on 10 February 2017, Friday, a strong earthquake of magnitude 6.7 shook the island of Mindanao. The epicenter is located 16 km offshore northwest of Surigao City, Surigao Strait with a depth of 10 km. The earthquake was generated by the movement of Surigao segment of the Philippine Fault. Small-magnitude earthquakes followed afterwards, and as of 6:00 AM of 21 February 2017, 227 aftershocks have been recorded by the PHIVOLCS seismic monitoring network.
Based on preliminary intensity reports, the strongest ground shaking was felt at PHIVOLCS Earthquake Intensity Scale (PEIS) VII (Destructive) in Surigao City. Furthermore, the municipalities of Pintuyan in Southern Leyte, and San Francisco and Malimono in Surigao del Norte experienced the ground shaking at PEIS VI (Very Strong), while the municipalities of Mainit and Placer in Surigao Del Norte, Libjo and San Jose in Dinagat Island, San Ricardo, Limasawa and San Francisco in Southern Leyte and Manduae City felt the shaking at PEIS V (Strong). This earthquake was felt PEIS IV to I as far as 250 km away (Butuan City, Ormoc City, Tacloban City, Catbalogan City, Bislig City, Cebu City, Cagayan De Oro City, Dumaguete City and Tagbilaran City) from the epicentral area. The strong ground shaking near the epicentral area resulted to damages to some buildings, roads and bridges.