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Geographic Area 

The report covers the Wellington region, including the city of Wellington and surrounding areas influenced by local fault systems. 

Summary 

This report, prepared by the Wellington Regional Council in October 1992, evaluates the ground shaking hazard in the Wellington region. It draws on geological and seismological data to assess the potential for strong ground motion resulting from earthquakes. The region is known for its seismic activity due to the presence of several active fault lines, including the Wellington Fault, which runs through the city. The report identifies the types of earthquakes that could affect the area, including those originating from local faults, subduction zones, and distant sources. It discusses the expected levels of ground shaking and the likelihood of various intensities occurring over different timeframes. 
 
The study uses historical earthquake records and geological investigations to estimate the frequency and severity of ground shaking. It highlights that the Wellington Fault poses a significant risk, with the potential to produce large earthquakes that could result in severe shaking. The report also considers the effects of soil conditions, which can amplify ground motion in certain areas. Maps and models are used to illustrate the expected distribution of shaking intensity across the region. 
 
The findings indicate that parts of Wellington are particularly vulnerable to strong shaking due to their proximity to active faults and local geological conditions. The report emphasizes the importance of incorporating seismic hazard information into land use planning and building design to reduce risk. It recommends further studies to refine hazard assessments and improve preparedness. 
 
Overall, the report provides a comprehensive overview of the ground shaking hazard in Wellington, serving as a foundation for risk mitigation strategies and informing local authorities and the public about potential earthquake impacts.