Earthquake Information for San Juan County, Washington

San Juan County, WA has a very high earthquake risk, with a total of 40 earthquakes since 1931. The USGS database shows that there is a 81.11% chance of a major earthquake within 50km of San Juan County, WA within the next 50 years. The largest earthquake within 30 miles of San Juan County, WA was a 5.1 Magnitude in 1976.

Risk Level:
Very High
Total Number of Earthquakes in San Juan County since 1931
40
Probability of A 5.0 Earthquake within next 50 years
81.11%

Earthquake Probability for San Juan County, WA

View the probability of a major earthquake within the next 50 years in San Juan County, WA.

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
81.11%
5.1
76.90%
5.2
76.90%
5.2
72.52%
5.3
68.04%
5.4
63.57%
5.5
59.17%
5.6
54.90%
5.7
50.80%
5.8
46.91%
5.9
43.23%
6.0
39.80%
6.1
36.21%
6.2
32.86%
6.3
29.60%
6.4
26.52%
6.5
23.54%
6.6
18.74%
6.7
15.03%
6.8
11.46%
6.9
8.66%
7.0
5.96%
7.1
3.52%
7.2
1.19%
7.3
0.71%
7.4
0.39%
7.5
0.18%
7.6
0.08%
7.7
0.02%
7.8
0.01%
7.9
0.00%
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%