Z-values to determine seismic risk

Last updated: 24 August 2018

These tables are provided to help territorial authorities determine whether the area in which a building is located is a low, medium or high seismic risk area, and for engineers who carry out seismic assessments of potentially earthquake-prone buildings in accordance with the EPB methodology.

The Z factor used to determine the seismic risk area is in accordance with the Standard that is cited in the Verification Method for Building Regulations Clause B1-Structure and applied when the new system for identifying, assessing and managing earthquake-prone buildings came into force on 1 July 2017.

The area in which a building is located has:

  • a low seismic risk if the area has a Z factor that is less than 0.15; and
  • a medium seismic risk if the area has a Z factor that is greater than or equal to 0.15 and less than 0.3; and
  • a high seismic risk if the area has a Z factor that is greater than or equal to 0.3.

Source: NZS 1170.5:2004 (Incorporating Amendment No 1). Reproduced with permission from Standards New Zealand. 

North Island

 LocationZ
1 Kaitaia 0.10
2 Paihia/Russell 0.10
3 Kaikohe 0.10
4 Whangarei  0.10
5 Dargaville  0.10
6 Warkworth 0.13
7 Auckland 0.13
8 Manakau City 0.13
9 Waiuku 0.13
10 Pukekohe 0.13
11 Thames 0.16
12 Paeroa 0.18 
13 Waihi 0.18 
14 Huntly 0.15 
15 Ngaruawahia  0.15 
16 Morrinsville  0.18 
17 Te Aroha  0.18 
18 Tauranga 0.20 
19 Mount Maunganui  0.20 
20 Hamilton  0.16 
21 Cambridge 0.18 
22 Ta Awamutu  0.17 
23 Matamata  0.19 
24 Te Puke  0.22 
25 Putaruru  0.21 
26 Tokoroa  0.21 
27 Otorohanga  0.17 
28 Te Kuiti  0.18 
29 Mangakino  0.21 
30 Rotorua  0.24 
31 Kawerau  0.29 
32 Whakatane  0.30 
33 Opotiki  0.30 
34 Ruatoria  0.33 
35 Murupara  0.30 
36 Taupo 0.28 
37 Taumarunui 0.21 
38 Turangi  0.27 
39 Gisborne  0.36 
40 Wairoa  0.37 
41 Waitara  0.18 
42 New Plymouth  0.18 
43 Inglewood  0.18 
44 Stratford  0.18 
45 Opunake 0.18 
46 Hawera 0.18 
47 Patea  0.19 
48 Raetihi 0.26 
49 Ohakune  0.27 
50 Waiouru  0.29 
51 Napier  0.38 
52 Hastings  0.39 
53 Wanganui  0.25 
54 Waipawa  0.41 
55 Waipukurau 0.41 
56 Taihape  0.33 
57 Marton  0.30 
58 Bulls  0.31 
59 Feilding  0.37 
60 Palmerston North  0.38 
61 Dannevirke  0.42 
62 Woodville  0.41 
63 Pahiatua 0.42 
64 Foxton/Foxton Beach  0.36 
65 Levin  0.40 
66 Otaki  0.40 
67 Waikanae  0.40 
68 Paraparaumu  0.40 
69 Masterton 0.42 
70 Porirua 0.40 
71 Wellington CBD
(north of Basin Reserve) 
0.40 
72 Wellington  0.40 
73 Hutt Valley–south of Taita Gorge  0.40 
74 Upper Hutt  0.42 
75 Eastbourne–Point Howard 0.40 
76 Wainuiomata  0.40

South Island

 LocationZ
77 Takaka 0.23 
78 Motueka  0.26 
79 Nelson 0.27 
80 Picton  0.30 
81 Blenheim  0.33 
82 St Arnaud  0.36 
83 Westport  0.30 
84 Reefton  0.37 
85 Murchison  0.34 
86 Springs Junction  0.45 
87 Hanmer Springs  0.55 
88 Seddon  0.40 
89 Ward  0.40 
90 Cheviot  0.40 
91 Greymouth  0.37
92 Kaikoura  0.42 
93 Harihari  0.46 
94 Hokitika  0.45 
95 Fox Glacier  0.44 
96 Franz Josef  0.44 
97 Otira  0.60 
98 Arthurs Pass  0.60 
99 Rangiora  0.33 
100 Darfield  0.30 
101 Akaroa
0.30 
102 Christchurch  0.30 
103 Geraldine  0.19 
104 Ashburton  0.20 
105 Fairlie  0.24 
106 Temuka  0.17 
107 Timaru  0.15 
108 Mt Cook  0.38 
109 Twizel  0.27 
110 Waimate  0.14
111 Cromwell  0.24 
112 Wanaka  0.30 
113 Arrowtown  0.30 
114 Alexandra  0.21 
115 Queenstown  0.32 
116 Milford Sound  0.54 
117 Palmerston  0.13 
118 Oamaru  0.13 
119 Dunedin  0.13 
120 Mosgiel  0.13  
121 Riverton  0.20 
122 Te Anau  0.36
123 Gore  0.18 
124 Winton  0.20 
125 Balclutha  0.13 
126 Mataura  0.17 
127 Bluff  0.15 
128 Invercargill  0.17 
129 Oban  0.14 


Disclaimer: 
These tables are based on Table 3.3 from NZS 1170.5:2004 and are used with permission from Standards New Zealand, on behalf of the New Standards Executive, under copyright licence LN001239.

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