City of Irvine
2020 Local Hazard Mitigation Plan
Fault Rupture To analyze the social threat associated with fault rupture, the City used two different fault rupture data sets mapped in Figure 4-8. These fault data sets provided by the California Geological Survey and City of Irvine were then mapped and analyzed using a 500-foot buffer around each fault segment. Table 4-15 identifies the threatened populations within fault rupture areas, which includes over 9,000 residents that have a median household income that is over $40,000 higher than the City average. In these areas, there is a higher percentage of persons living with a disability and a lower percentage of households with one- member aged 65+.
Table 4-15: Fault Rupture Hazard Threatened Populations
Threatened Population Metric
Fault Rupture (California Geological Survey)
Fault Rupture (City of Irvine)
City of Irvine
Population
9,254
68,786
256,877
Households
3,811
25,769
92,869
Median household income
138,577
$122,160
$95,573
Percentage of households with at least one person living with a disability
10.7%
8.3%
5.8%
Percentage of households living under poverty limit
12.6%
11.0%
13.2%
Percentage of households with one-member aged 65+
10.8%
12.0%
19.5%
Liquefaction Since a large portion of the City is located within a designated zone of liquefaction, a large proportion of the City’s population (over 37%) face s the threat of impact due to liquefaction. Thankfully, much of the construction that has occurred over the years throughout the City has taken liquefaction into consideration. Newer buildings constructed in these areas are anticipated to contain moderate- and high- income tenants that would have greater amounts of disposable income to use during recovery after an incident. However, lower-income residents and residents located in areas of older construction may be impacted greater due to the lack of financial resources need to make repairs and/or the cost associated with retrofitting older buildings. Table 4-16 compares the populations within the liquefaction hazard zones with citywide populations. This hazard zone covers the largest population and number of households by far, which have a median household income that is approximately $6,000 higher than the Citywide figure. Persons living with a disability is more than double the City average, while households with a member aged 65+ is approximately 6 percent lower than the City average.
Table 4-16: Liquefaction Hazard Threatened Populations
Liquefaction Zones
Threatened Population Metric
City of Irvine
Population
95,782
256,877
Households
33,920
92,869
Median household income
$101,990
$95,573
Percentage of households with at least one person living with a disability
12.8%
5.8%
Percentage of households living under the poverty limit
12.0%
13.2%
Percentage of households with one member aged 65+
13.6%
19.5%
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