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City of Solana Beach
Section 3
Shoreline and Coastal Bluff Management Strategies Draft MEIR
Environmental Impact Analyses
the Rose Canyon and Coronado Bank fault zones are designated by the California Department
of Mines and Geology (CDMG) as active, and the La Nacion Fault has been designated as
potentially active. Table 3.1-1 presents the seismic parameters and distances for faults most
likely to affect the project area in terms of ground shaking. The most significant seismic event at
the site would be an earthquake of Richter magnitude 7.0 associated with the Rose Canyon
Fault Zone, which is approximately 2.5 miles west of the Solana Beach coastline. The regional
fault map is presented in Figure 3.1-5.
Table 3.1-1
Seismic Parameters for Major Active and
Potentially Active Faults Affecting Solana Beach
Estimated Peak
Distance from
Maximum Credible
Horizontal
Modified
Design
Earthquake1
Fault t1o Project
Ground
Mercalli
Earthquake
Intensity2
(g)3
Fault
Area (miles)
(Richter Magnitude)
Elsinore
30
7.5
0.11
X-XI
San Jacinto
54
7.0
0.03
X-XI
San Andreas
77
8.0
0.05
IX-X
(creep section)
San Diego Trough
27
7.5
0.13
IX-X
0.30
Coronado Bank
17
7.5
0.22
IX-X
San Clemente
48
8.0
0.09
IX-X
Rose Canyon
2.5
7.0
0.55
IX-X
Newport-Inglewood
13
7.1
0.22
IX-X
(Offshore)
La Nacion4
13
6.5
0.17
IX-X
1
Blake, 1996.
2
USGS, 1980.
3
Blake, 1998. Based on ICBO, UBC, 1997, for the event with a 10 percent probability of being exceeded in 50 years.
4
Considered to be potentially active.
3.1.2 Environmental Impacts
3.1.2.1 Significance Criteria and Methodology
This section focuses on potential geologic, seismic, and soils impacts on each of the project
alternatives.  Impacts of the alternative on the geologic environment would be considered
significant if:
Unique geologic features of unusual scientific value, for study or interpretation, would be
adversely affected.
Geologic processes such as major landsliding or erosion would be triggered or accelerated.
Project No. 323530000
Page 3-11






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