M1.7 earthquake 38 km S of Morton, Washington

Magnitude

1.7 (Md, duration), micro

Magnitude from

Pacific Northwest Seismic Network

Local time

Wed, Aug 28, 1991, 5:34 PM PDT

UTC

1991-08-29 00:34:37 UTC

Depth

3.1 km (1.9 mi), shallow

Epicenter

46.214° N, 122.186° W

Region

Washington

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 3.0 km horizontally, 2.5 km in depth

Magnitude uncertainty

±0.07

Depth from

From location

Station coverage gap

147°

Stations used

7

• Morton, WashingtonPopulation 1,128. Forecast39 kmS
• Battle Ground, WashingtonPopulation 19,407. Forecast55 kmNNE
• Vancouver, WashingtonPopulation 196,442. Forecast74 kmNNE
• Calgary, CanadaPopulation 1,306,784. Forecast801 kmSW

After

1. 2.038 km NNE of Amboy, WashingtonThu, Aug 29, 5:37 AM PDT · 12818 days ago · -1 km deep · 2 km away
2. 2.222 km ENE of Ashford, WashingtonTue, Sep 3, 8:46 AM PDT · 12813 days ago · -2 km deep · 79 km away
3. 2.237 km NNE of Amboy, WashingtonThu, Sep 5, 12:20 AM PDT · 12811 days ago · -2 km deep · 3 km away
4. 2.837 km NNE of Amboy, WashingtonMon, Sep 9, 5:17 PM PDT · 12806 days ago · 3 km deep · 2 km away
5. 2.019 km S of Morton, WashingtonTue, Sep 10, 9:02 AM PDT · 12806 days ago · 16 km deep · 20 km away
6. 2.238 km NNE of Amboy, WashingtonTue, Sep 10, 5:13 PM PDT · 12805 days ago · 2 km deep · 1 km away
7. 2.138 km NNE of Amboy, WashingtonThu, Sep 12, 9:12 AM PDT · 12804 days ago · 5 km deep · 1 km away
8. 1.838 km NNE of Amboy, WashingtonFri, Sep 13, 1:08 AM PDT · 12803 days ago · 3 km deep · 1 km away
9. 2.333 km NE of Amboy, WashingtonMon, Sep 16, 3:29 PM PDT · 12799 days ago · 0 km deep · 8 km away
10. 1.836 km NNE of Amboy, WashingtonMon, Sep 16, 5:37 PM PDT · 12799 days ago · -2 km deep · 3 km away
11. 1.923 km S of Morton, WashingtonMon, Sep 23, 3:51 AM PDT · 12793 days ago · 9 km deep · 15 km away
12. 2.538 km NNE of Amboy, WashingtonTue, Sep 24, 6:15 AM PDT · 12792 days ago · -2 km deep · 1 km away
13. 2.338 km NNE of Amboy, WashingtonTue, Sep 24, 5:31 PM PDT · 12791 days ago · -2 km deep · 1 km away
14. 2.127 km SSE of Mossyrock, WashingtonSat, Sep 28, 1:37 PM PDT · 12787 days ago · 0 km deep · 15 km away
15. 1.720 km ENE of Ashford, WashingtonSun, Sep 29, 8:45 PM PDT · 12786 days ago · -1 km deep · 76 km away
16. 1.938 km NNE of Amboy, WashingtonWed, Oct 2, 2:18 PM PDT · 12783 days ago · -1 km deep · 1 km away
17. 1.525 km NE of Ashford, WashingtonWed, Oct 2, 2:40 PM PDT · 12783 days ago · -1 km deep · 84 km away
18. 2.29 km E of Wilkeson, WashingtonThu, Oct 3, 2:52 PM PDT · 12782 days ago · 16 km deep · 100 km away
19. 1.627 km NE of Ashford, WashingtonTue, Oct 8, 4:46 AM PDT · 12778 days ago · 5 km deep · 84 km away
20. 1.57 km W of Deer Island, OregonTue, Oct 8, 12:43 PM PDT · 12777 days ago · 23 km deep · 66 km away
21. 1.624 km NE of Ashford, WashingtonWed, Oct 9, 1:36 PM PDT · 12776 days ago · -1 km deep · 82 km away
22. 2.122 km ENE of Ashford, WashingtonThu, Oct 10, 3:45 AM PDT · 12776 days ago · -2 km deep · 79 km away
23. 2.422 km ENE of Ashford, WashingtonFri, Oct 11, 5:00 PM PDT · 12774 days ago · -2 km deep · 78 km away
24. 1.78 km N of Bethany, OregonThu, Oct 17, 7:49 PM PDT · 12768 days ago · 18 km deep · 84 km away
25. 3.18 km ENE of North Plains, OregonThu, Oct 17, 7:49 PM PDT · 12768 days ago · 20 km deep · 85 km away
26. 1.58 km N of Bethany, OregonFri, Oct 18, 12:06 AM PDT · 12768 days ago · 19 km deep · 83 km away
27. 1.79 km N of Bethany, OregonFri, Oct 18, 12:45 AM PDT · 12768 days ago · 20 km deep · 83 km away
28. 2.88 km N of Bethany, OregonFri, Oct 18, 12:57 PM PDT · 12767 days ago · 18 km deep · 83 km away
29. 1.79 km N of Bethany, OregonSat, Oct 19, 7:17 PM PDT · 12766 days ago · 19 km deep · 83 km away
30. 3.08 km N of Bethany, OregonSun, Oct 20, 5:51 PM PDT · 12765 days ago · 20 km deep · 85 km away
31. 1.88 km N of Bethany, OregonMon, Oct 21, 11:03 PM PDT · 12764 days ago · 19 km deep · 83 km away
32. 1.610 km NE of North Plains, OregonTue, Oct 22, 12:57 AM PDT · 12764 days ago · 17 km deep · 83 km away
33. 2.18 km N of Bethany, OregonTue, Oct 22, 12:43 PM PDT · 12763 days ago · 20 km deep · 84 km away
34. 2.19 km SE of Bucoda, WashingtonSat, Oct 26, 1:13 AM PDT · 12760 days ago · 21 km deep · 74 km away
35. 1.924 km ENE of Ashford, WashingtonSat, Oct 26, 11:41 AM PDT · 12760 days ago · -2 km deep · 81 km away

Before

1. 2.238 km NNE of Amboy, WashingtonWed, Aug 28, 4:06 AM PDT · 12819 days ago · -2 km deep · 1 km away
2. 1.628 km N of Packwood, WashingtonSun, Aug 25, 9:41 PM PDT · 12821 days ago · -1 km deep · 82 km away
3. 2.09 km ENE of Ashford, WashingtonSat, Aug 17, 8:49 AM PDT · 12830 days ago · 6 km deep · 67 km away
4. 1.75 km SSE of Mineral, WashingtonSun, Aug 11, 2:52 PM PDT · 12835 days ago · 18 km deep · 52 km away
5. 2.016 km N of Amboy, WashingtonThu, Aug 8, 12:32 PM PDT · 12838 days ago · 17 km deep · 26 km away
6. 2.39 km ENE of Ashford, WashingtonFri, Aug 2, 11:42 AM PDT · 12845 days ago · 5 km deep · 66 km away
7. 1.89 km ENE of Ashford, WashingtonFri, Aug 2, 8:43 AM PDT · 12845 days ago · 5 km deep · 66 km away
8. 1.79 km N of Bethany, OregonWed, Jul 31, 11:03 AM PDT · 12847 days ago · 6 km deep · 82 km away
9. 2.28 km N of Bethany, OregonTue, Jul 30, 1:10 PM PDT · 12847 days ago · 17 km deep · 83 km away

From the USGS Earthquake Hazards Program and its partner networks, event uw10282053. Read Fri, Oct 2, 2026, 6:33 AM UTC.