Earthquake Information for Ontario, California

Ontario, CA has a very high earthquake risk, with a total of 10,139 earthquakes since 1931. The USGS database shows that there is a 99.37% chance of a major earthquake within 50km of Ontario, CA within the next 50 years. The largest earthquake within 30 miles of Ontario, CA was a 5.7 Magnitude in 1990.

Risk Level:
Very High
Total Number of Earthquakes in Ontario since 1931 within 50 miles
10,139
Probability of A 5.0 Earthquake within next 50 years
99.37%

Earthquake Probability for Ontario, CA

View the probability of a major earthquake within the next 50 years in Ontario, 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
99.37%
5.1
98.90%
5.2
98.90%
5.2
98.26%
5.3
97.45%
5.4
96.49%
5.5
95.43%
5.6
94.30%
5.7
93.15%
5.8
92.03%
5.9
90.95%
6.0
89.94%
6.1
88.91%
6.2
87.97%
6.3
86.97%
6.4
85.01%
6.5
80.90%
6.6
76.84%
6.7
72.52%
6.8
68.49%
6.9
64.34%
7.0
60.00%
7.1
55.75%
7.2
51.55%
7.3
46.54%
7.4
41.52%
7.5
35.37%
7.6
28.40%
7.7
21.06%
7.8
14.49%
7.9
9.02%
8.0
4.53%
8.1
1.68%
8.2
0.30%
8.3
0.06%
8.4
0.01%
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%