From Source to Building Fragility: Post-Event Assessment of the 2013 M7.1 Bohol, Philippines, Earthquake

Abstract

We use ground-motion simulations of the 2013 Bohol, Philippines, earthquake along with a new post-disaster exposure/damage database to constrain building fragility and vulnerability. The large number of damaged buildings (>70,000) and the wide spread of seismic intensities caused by this earthquake make it an ideal candidate for such a study. An extensive survey was conducted leading to a robust description of over 25,000 damaged and undamaged structures. Ground-motion fields were simulated using ground-motion prediction equations and stochastic modeling, and the estimated and observed values were compared. The finite source model used in the simulation was based on the analysis of aftershocks and SAR data. The ground motions were associated with the empirical database to derive fragility and vulnerability models. Results indicate that the pattern of damage is best captured in the stochastic simulation. Constraints were placed on seismic building fragility and vulnerability models, which can promote more effective implementation of construction regulations and practices.

Shallow crustal earthquake models, damage, and loss predictions in Banda Aceh, Indonesia

“…The intensity validation model used with respect to Aceh province, along with the effects of local geology, work well to correctly estimate an intensity model. The fragility curve of C1-L developed by Tingatinga et al (2013) and Naguit et al (2017) are compatible with parameters found in Aceh province.…”

“…C1-L and C1-M buildings have nearly similar trend of fragility curves, but the W1-L curve has lower damage ratios. The lighter wood material makes the W1-L building more resistant to the earthquake ground motion compared to C1-L and C1-M, as has been shown by field study conducted by Naguit et al (2017).…”

“…Damage estimates of several types of buildings were determined using building fragility curves. As there were no published building fragility curves specific to Indonesia, this study used fragility curves developed for the Philippines by Tingatinga et al (2013) and Naguit et al (2017). Using the Philippines's fragility curve was appropriate because the building construction types in Indonesia are quite similar to those of the Philippines.…”

“…Earthquakes occurring on these faults are only a short distance from the city, and given that these are shallow crustal earthquakes large events are likely to result in high levels of building damage and casualties among residents (Allen et al 2012). Different building typologies have different resistances to ground shaking, which also varies from one area to another and can be estimated from the fragility curves developed by Tingatinga et al (2013) and Naguit et al (2017). The types of building studied by them were similar to the typical buildings proposed by FEMA (2010) and were similar to the construction types in Aceh Province -see research conducted by Gentile et al (2019) and Idris et al (2019).…”

“…The building typology distribution in Banda Aceh city measured in 2016. b Heuristic fragility curve of 3 variants of buildings in Banda Aceh(Tingatinga et al 2013;Naguit et al 2017) …”