Earthquake Information for Multnomah County, Oregon

Multnomah County, OR has a high earthquake risk, with a total of 4 earthquakes since 1931. The USGS database shows that there is a 31.80% chance of a major earthquake within 50km of Multnomah County, OR within the next 50 years. The largest earthquake within 30 miles of Multnomah County, OR was a 3.9 Magnitude in 1989.

Risk Level:
High
Total Number of Earthquakes in Multnomah County since 1931
4
Probability of A 5.0 Earthquake within next 50 years
31.80%

Earthquake Probability for Multnomah County, OR

View the probability of a major earthquake within the next 50 years in Multnomah County, OR.

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
31.80%
5.1
28.49%
5.2
28.49%
5.2
25.62%
5.3
23.14%
5.4
21.01%
5.5
19.20%
5.6
17.66%
5.7
16.36%
5.8
15.26%
5.9
14.29%
6.0
13.38%
6.1
12.29%
6.2
11.06%
6.3
8.46%
6.4
7.55%
6.5
6.88%
6.6
5.50%
6.7
4.29%
6.8
3.20%
6.9
2.26%
7.0
1.32%
7.1
0.64%
7.2
0.03%
7.3
0.01%
7.4
0.00%
7.5
0.00%
7.6
0.00%
7.7
0.00%
7.8
0.00%
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%