Abstract
An analysis of damage costs to domestic property in the Mw 7.2 Inangahua, New Zealand, earthquake of 23 May 1968 (U.T.) has allowed the evaluation of the vulnerability of domestic property for six intensity zones, from MM5 - MM10 inclusive. For no other earthquake worldwide has the vulnerability of any class of property been examined in so many intensity zones, and the effect of brittle chimneys on damage levels has been fully evaluated for the first time. The relative vulnerability of one and two storey houses has also been evaluated. The costs of damage were derived from about 8,000 insurance claims to the Earthquake and War Damage Commission. Damage ratios were evaluated for houses and their contents as functions of Modified Mercalli intensity. The indicators of vulnerability that were determined were the statistical distributions and mean values of damage ratios and the percentage of property items damaged for the six intensity zones. Comparisons have also been made with results from studies of other earthquakes.
Highlights
SUMMARYAn analysis of damage costs to domestic property in the M .. 7.2 Inangahua, New Zealand, earthquake of 23 May 1968 (U.T.) has allowed the evaluation of the vulnerability of domestic property for six intensity zones, from MM5 - MM IO inclusive
The earthquake was felt over most of the country from North Cape to lnvercargill, with intensities ranging up to Modified Mercalli X (MM 10) in the lnangahua area [4], as shown in the isoseismal map (Figure I). This earthquake was New Zealand's fourth most damaging in material damage cost terms in over one hundred years [5]. While it was fortunate in socio-economic terms that much of the area or strong shaking was in part of the lightly populated Southern Alps (Figure 2), the earthquake resulted in over 11,000 insurance claims being made on the New Zealand Earthquake and War Damage Commission (EWDC)
By visual inspection of the isoseismal map (Figures I and 2), we find that the centroid of the locations of the houses in the intensity zones MM5 to MM8 are likely to be near the centre of their respective intensity zones, as the rural houses are reasonably uniformly distributed across the intensity zones and the largest population centres are near the centre of the respective intensity zone
Summary
An analysis of damage costs to domestic property in the M .. 7.2 Inangahua, New Zealand, earthquake of 23 May 1968 (U.T.) has allowed the evaluation of the vulnerability of domestic property for six intensity zones, from MM5 - MM IO inclusive. An analysis of damage costs to domestic property in the M .. 7.2 Inangahua, New Zealand, earthquake of 23 May 1968 (U.T.) has allowed the evaluation of the vulnerability of domestic property for six intensity zones, from MM5 - MM IO inclusive. The relative vulnerability of one and two storey houses has been evaluated. The costs of damage were derived from about 8,000 insurance claims to the Earthquake and War Damage Commission. Damage ratios were evaluated for houses and their contents as functions of Modified Mercalli intensity. The indicators of vulnerability that were determined were the statistical distributions and mean values of damaoe ratios and the percentaoe of property items damaged for the six intensity zones. Comparisons have been made with results from studies of other earthquakes
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