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Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
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Volume 14, issue 10 | Copyright
Nat. Hazards Earth Syst. Sci., 14, 2795-2801, 2014
https://doi.org/10.5194/nhess-14-2795-2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.

Brief communication 22 Oct 2014

Brief communication | 22 Oct 2014

Brief Communication: On the source characteristics and impacts of the magnitude 7.2 Bohol earthquake, Philippines

A. M. F. Lagmay1,2 and R. Eco1,2 A. M. F. Lagmay and R. Eco
  • 1National Institute of Geological Sciences, University of the Philippines, C. P. Garcia corner Velasquez street, U. P. Diliman, 1101 Quezon City, Philippines
  • 2Department of Science and Technology (DOST) – Project NOAH, Univeristy of the Philippines, C. P. Garcia corner Velasquez street, U. P. Diliman, 1101 Quezon City, Philippines

Abstract. A devastating earthquake struck Bohol, Philippines, on 15 October 2013. The earthquake originated at 12 km depth from an unmapped reverse fault, which manifested on the surface for several kilometers and with maximum vertical displacement of 3 m. The earthquake resulted in 222 fatalities with damage to infrastructure estimated at USD 52.06 million. Widespread landslides and sinkholes formed in the predominantly limestone region during the earthquake. These remain a significant threat to communities as destabilized hillside slopes, landslide-dammed rivers and incipient sinkholes are still vulnerable to collapse, triggered possibly by aftershocks and heavy rains in the upcoming months of November and December. The most recent fatal temblor originated from a previously unmapped fault, herein referred to as the Inabanga Fault. Like the hidden or previously unmapped faults responsible for the 2012 Negros and 2013 Bohol earthquakes, there may be more unidentified faults that need to be mapped through field and geophysical methods. This is necessary to mitigate the possible damaging effects of future earthquakes in the Philippines.

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