Earthquake Information for San Marcos, California

San Marcos, CA has a very high earthquake risk, with a total of 2,275 earthquakes since 1931. The USGS database shows that there is a 83.40% chance of a major earthquake within 50km of San Marcos, CA within the next 50 years. The largest earthquake within 30 miles of San Marcos, CA was a 4.2 Magnitude in 1991.

Risk Level:
Very High
Total Number of Earthquakes in San Marcos since 1931 within 30 miles
2,275
Probability of A 5.0 Earthquake within next 50 years
83.40%

Earthquake Probability for San Marcos, CA

View the probability of a major earthquake within the next 50 years in San Marcos, CA.

Probability of Earthquakes Within the Next 50 Years For Magnitudes Between 5.0 and 9.2
(within 31 km/51 miles above magnitude)
MAGNITUDE
PROBABILITY
5.0
83.40%
5.1
78.18%
5.2
78.18%
5.2
72.60%
5.3
66.88%
5.4
61.23%
5.5
55.81%
5.6
50.72%
5.7
46.04%
5.8
41.81%
5.9
38.05%
6.0
34.73%
6.1
31.00%
6.2
27.74%
6.3
24.81%
6.4
22.28%
6.5
19.98%
6.6
18.44%
6.7
16.65%
6.8
14.92%
6.9
13.16%
7.0
11.27%
7.1
10.06%
7.2
8.97%
7.3
7.74%
7.4
6.25%
7.5
4.38%
7.6
2.91%
7.7
1.62%
7.8
0.65%
7.9
0.17%
8.0
0.00%
8.1
0.00%
8.2
0.00%
8.3
0.00%
8.4
0.00%
8.5
0.00%
8.6
0.00%
8.7
0.00%
8.8
0.00%
8.9
0.00%
9.0
0.00%
9.1
0.00%
9.2
0.00%
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