Fig. 7: Performance-based design matrix adapted from Elnashai and Di Sarno⁶² and Tsompanakis⁶³.

The return periods for Itbayat, Batanes are probabilistic estimates from the Philippine Earthquake Model⁶⁴ and the Regional Severe Wind Hazard Maps of the Philippines⁴⁵. (Note that PEIS refers to the Philippine Volcanology and Seismology Earthquake Intensity Scale).