Reviewed by USGSCalifornia33y ago
M2.6 earthquake 34 km SSW of Ferndale, California
Thursday, April 8, 1993, 07:32:10 UTC · 40.315°N, 124.480°W
A magnitude 2.6 earthquake struck 34 km SSW of Ferndale, California on Thursday, April 8, 1993, 07:32:10 UTC, at a depth of 7.2 km (shallow).
- Magnitude
- 2.6
- Minor · md
- Depth
- 7 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
116 kg of TNT
That is about 1/130,119 of the Hiroshima bomb. A magnitude 5.0 releases about 4,121 times more energy.
Tectonic setting
1 km
from the nearest mapped plate boundary, between the North American and Pacific plates. Earthquakes cluster along boundaries like this one, where plates collide, pull apart or slide past each other.
Depth: shallow
7 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 6 M2.5+ earthquakes within 50 km in the following 30 days; the largest was M3.2 on April 14, 1993. Most nearby activity right after a large earthquake is aftershocks, which usually become less frequent over days and weeks.
- 3.039 km WSW of Ferndale, California33y ago · 24 km NW of this epicenter
- 2.625 km SW of Scotia, California33y ago · 16 km E of this epicenter
- 2.924 km SW of Scotia, California33y ago · 18 km E of this epicenter
- 3.163 km WSW of Ferndale, California33y ago · 38 km W of this epicenter
- 3.240 km SW of Ferndale, California33y ago · 11 km W of this epicenter
- 2.537 km SSW of Ferndale, California33y ago · 3 km SW of this epicenter
Regional history
Past M5+ earthquakes within 300 km
USGS lists 159 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:
- 7.4123 km W of Big Lagoon, CaliforniaJanuary 31, 1922 · 136 km NW of this epicenter
- 7.2The 1992 Petrolia, California EarthquakeApril 25, 1992 · 21 km E of this epicenter
- 7.2The 1980 Eureka, California EarthquakeNovember 8, 1980 · 91 km N of this epicenter
- 7.1The 1923 Humboldt County, California EarthquakeJanuary 22, 1923 · 50 km W of this epicenter
- 7.0136 km WSW of Brookings, OregonAugust 17, 1991 · 191 km NW of this epicenter
- 6.9103 km W of Pistol River, OregonJuly 13, 1991 · 229 km NW of this epicenter
- 6.8123 km W of Ferndale, CaliforniaNovember 25, 1954 · 105 km W of this epicenter
- 6.884 km W of Ferndale, CaliforniaFebruary 9, 1941 · 76 km NW of this epicenter
History · NOAA
Deadliest earthquakes in this area
NOAA’s significant-earthquake database lists 20 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 3 recorded deaths. The most severe:
- 1969M4.8
Santa Rosa
2 Oct 1969 · 257 km away · intensity VIII
1 death$8 million damage
- 1954M6.6
Humboldt County
21 Dec 1954 · 77 km away
1 death$2 million damage
- 1932M6.5
Eureka
6 Jun 1932 · 49 km away · intensity VIII
1 deathModerate damage ($1–5M)
- 1992M7.1
Humboldt County: Ferndale, Petrolia
25 Apr 1992 · 15 km away · intensity VIII
$75 million damagetsunami
- 1980M7.2
North Coast
8 Nov 1980 · 91 km away · intensity VII
$2 million damage
- 1898M6.5
Sonoma County
31 Mar 1898 · 296 km away · intensity VIII
Moderate damage ($1–5M)tsunami
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.