Earthquake loss estimation of residential buildings in Bantul regency, Indonesia

Abstract

Bantul regency in 2006 had experienced considerable earthquake and suffered many casualties. The factors such as high population density and lack of seismic design of residential buildings in Bantul besides its location in a high seismic region have increased its vulnerability to earthquake disasters that can lead to a widespread economic losses and casualties. This research aims to capture earthquake risk in Bantul towards economic losses and casualties by using risk curve. Risk curve is a combination of several sources from literatures containing hazard curve and vulnerability curve together with exposure. The result showed that the expected economic loss in 50 years for residential building is $647.22 million; however, the highest value of economic losses shows the value up to $7600m which occurs in earthquake of 7.15 M W scale. The same worst-case scenario caused the casualties up to 49 000 people at night-time and 15 000 people at daytime. The result established that confined masonry building type conduces the highest value of economic losses and timber frame building shows the highest vulnerability to the earthquake disaster than other building types. Furthermore, in order to reduce the risk, we applied the hypothetical policy to build a simple earthquake-resistant house called Simple Instant Healthy House. The result indicates that this mitigation policy can effectively reduce both economic losses and casualties.

Assessment of Flood Damage to Residential Houses and Analysis of Effectiveness of Flood Damage Reduction Measures

“…The average exposed value (rebuilding value) of residential houses per house was approximately 106.64 million IDR for masonry-walled house and 90 million IDR for wooden-walled house. The average replacement value of household contents per household was 32.37 million IDR 16) . Fig.…”

Fragility of Indonesian houses: scenario damage analysis of the 2006 Yogyakarta and 2009 Padang earthquakes

“…There is a chain of active volcanoes that run parallel to the coastline and through the impacted kabupaten are being constructed today, but in different proportions. Aulady and Fujimi (2019) have found that the more seismically resilient confined masonry is now the dominant housing type whereas prior to the 2006 earthquake it was unreinforced masonry (Elnashai et al 2007), which is more fragile. Saputra et al (2017) found that poor construction practices still persist particularly in low-income households.…”