The area has high seismic activity even by New Zealand standards, with a major fault, the Wellington Fault, running through the centre of the city and several others nearby. Several hundred minor faults lines have been identified within the urban area. Inhabitants, particularly in high-rise buildings, typically notice several earthquakes every year. For many years after the 1855 earthquake, the majority of buildings were made entirely from wood. The 1996-restored Government Buildings near Parliament is the largest wooden building in the Southern Hemisphere. While masonry and structural steel have subsequently been used in building construction, especially for office buildings, timber framing remains the primary structural component of almost all residential construction. Residents place their confidence in good building regulations, which became more stringent in the 20th century. Since the Canterbury earthquakes of 2010 and 2011, earthquake readiness has become even more of an issue, with buildings declared by Wellington City Council to be earthquake-prone, and the costs of meeting new standards.