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Geographic Area 

The report covers the Wairarapa region including Masterton, Carterton, Greytown, Featherston, and Martinborough. 

Summary 

This report provides an assessment of the ground shaking hazard in the Wairarapa region, based on geological and seismic data available as of October 1992. The Wairarapa is known for its seismic activity, with historical earthquakes such as the 1855 Wairarapa earthquake highlighting the region’s vulnerability. The report outlines the geological setting, including fault lines and soil types, which influence the severity of ground shaking during seismic events. It discusses the potential for future earthquakes and the expected intensity of ground shaking across different parts of the region. The authors use ground motion prediction models and historical data to estimate peak ground accelerations and shaking intensities. Areas with soft soils or proximity to fault lines are identified as having higher risk. The report also considers the implications for land use planning and building design, recommending that local authorities incorporate seismic hazard information into development decisions. It emphasizes the importance of preparedness and risk mitigation, especially for critical infrastructure and densely populated areas. Overall, the report serves as a foundational document for understanding seismic risks in the Wairarapa and guiding future planning and hazard management efforts.