Reviewed by USGSOregon33y ago
M2.8 earthquake 4 km ESE of Scotts Mills, Oregon
Friday, March 26, 1993, 08:00:05 UTC · 45.034°N, 122.616°W
A magnitude 2.8 earthquake struck 4 km ESE of Scotts Mills, Oregon on Friday, March 26, 1993, 08:00:05 UTC, at a depth of 15.7 km (shallow).
- Magnitude
- 2.8
- Minor · md
- Depth
- 16 km
- Shallow
- Felt reports
- 0
- Did You Feel It?
- Est. shaking
- —
- No ShakeMap
- PAGER alert
- None
- Not issued
- Tsunami
- No flag
- USGS feed
Outlined circle: this earthquakeDashed circle: 50 km aftershock search area
In context
How big was it, and why here?
Energy released
239 kg of TNT
That is about 1/63,000 of the Hiroshima bomb. A magnitude 5.0 releases about 1,995 times more energy.
Tectonic setting
221 km
from the nearest mapped plate boundary, between the Juan de Fuca and North American plates. Earthquakes this far from a boundary happen on faults inside a plate, often less frequently but sometimes strongly.
Depth: shallow
16 km
Shallow earthquakes (under 70 km) produce the strongest surface shaking for their size, so they are the ones most likely to cause damage near the epicenter.
Did You Feel It?
Where it was felt
No “Did You Feel It?” reports have been published for this event yet. If you felt it, you can add your report on the USGS website.
I felt it — report to USGS ↗USGS PAGER estimate
Who was exposed to shaking
USGS publishes PAGER impact estimates for significant earthquakes, usually within an hour. No PAGER estimate is available for this event.
After the main event
Aftershocks within 50 km
USGS lists 3 M2.5+ earthquakes within 50 km in the following 30 days; the largest was M3.1 on March 26, 1993. Most nearby activity right after a large earthquake is aftershocks, which usually become less frequent over days and weeks.
Regional history
Past M5+ earthquakes within 300 km
USGS lists 28 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:
- 6.74 km WNW of Roy, WashingtonApril 13, 1949 · 220 km N of this epicenter
- 6.71 km ENE of Dash Point, WashingtonApril 29, 1965 · 255 km N of this epicenter
- 6.1Puget Sound region, WashingtonNovember 13, 1939 · 263 km N of this epicenter
- 6.048 km WNW of Langlois, OregonJune 4, 1925 · 296 km SW of this epicenter
- 5.8Puget Sound area, WashingtonFebruary 15, 1946 · 251 km N of this epicenter
- 5.738 km NNE of Amboy, WashingtonMay 18, 1980 · 135 km N of this epicenter
- 5.64 km E of Scotts Mills, OregonMarch 25, 1993 · 1 km E of this epicenter
- 5.6136 km W of Depoe Bay, OregonJune 16, 1973 · 248 km W of this epicenter
History · NOAA
Deadliest earthquakes in this area
NOAA’s significant-earthquake database lists 5 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 76 recorded deaths. The most severe:
- 1980M5.2
Mt St Helens
18 May 1980 · 135 km away · intensity V
61 deaths$2.0 billion damagetsunami
- 1949M7.0
Washington
13 Apr 1949 · 237 km away · intensity VIII
8 deaths$25 million damagetsunami
- 1965M6.6
Seattle
29 Apr 1965 · 264 km away · intensity VIII
7 deaths$28 million damage
- 1993M5.6
Washington-Oregon Border
25 Mar 1993 · 1 km away · intensity VII
$28 million damage
- 1700M9.0
Cascadia Subduction Zone
27 Jan 1700 · 187 km away
Severe damage ($5–24M)tsunami
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.