SECTION 4: RISK ASSESSMENT
Table 4.29 – Estimated Population Impacted by 500-Year Earthquake
Elderly Population At Risk
All Children Population
Children At Risk
Population At Risk
All Elderly Population
Total Population
Jurisdiction
Number Percent
Number Percent
Number Percent
Raleigh
476,892
420,104
88%
53,945
53,945
100%
26,904 26,904
100%
Apex
57,525
41,724
73%
5,963
5,963
100%
3,912
3,912
100%
Cary
164,869
137,544
83%
19,866
19,866
100%
9,432
9,432
100%
Fuquay-Varina
32,177
25,023
78%
4,432
4,432
100%
2,204
2,204
100%
Garner
35,232
30,981
88%
5,015
5,015
100%
2,863
2,863
100%
Holly Springs
30,885
25,787
83%
2,685
2,685
100%
2,254
2,254
100%
Knightdale
29,077
18,501
64%
3,207
3,207
100%
1,917
1,917
100%
Morrisville
21,999
18,655
85%
1,533
1,533
100%
1,627
1,627
100%
Rolesville
12,236
5,199
42%
1,401
1,401
100%
919
919
100%
Wake Forest
38,203
31,175
82%
4,777
4,777
100%
2,891
2,891
100%
Wendell
8,423
7,889
94%
1,361
1,361
100%
418
418
100%
Zebulon
5,751
6,102
106%
948
948
100%
437
437
100%
Unincorporated Wake County
230,494
135,124
59%
29,196
29,196
100%
14,301
14,301
100%
TOTAL
1,143,763
903,808
79%
134,329 134,329
100%
70,079
70,079
100%
Source: NCEM Risk Management Tool
PROPERTY In a severe earthquake event, buildings can be damaged by the shaking itself or by the ground beneath them settling to a different level than it was before the earthquake (subsidence). Buildings can even sink into the ground if soil liquefaction occurs. If a structure (a building, road, etc.) is built across a fault, the ground displacement during an earthquake could seriously damage that structure. Earthquakes can also cause damages to infrastructure, resulting in secondary hazards. Damages to dams or levees could cause failures and subsequent flooding. Fires can be started by broken gas lines and power lines. Fires can be a serious problem, especially if the water lines that feed the fire hydrants have been damaged as well. Wake County has not been impacted by an earthquake with more than a moderate intensity, so damage to the built environment is unlikely. Table 4.30 through Table 4.31 detail the estimated buildings impacted from varying magnitudes of earthquake events.
Wake County, NC Multi-Jurisdictional Hazard Mitigation Plan
WSP June 2024 Page 114
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