Reviewed by USGSCalifornia31y ago
M4.0 earthquake 116 km W of Ferndale, California
Monday, May 15, 1995, 21:57:54 UTC · 40.406°N, 125.616°W
A magnitude 4.0 earthquake struck 116 km W of Ferndale, California on Monday, May 15, 1995, 21:57:54 UTC, at a depth of 7.8 km (shallow).
- Magnitude
- 4.0
- Light · mw
- Depth
- 8 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
15 tons of TNT
That is about 1/998 of the Hiroshima bomb. A magnitude 5.0 releases about 32 times more energy.
Tectonic setting
5 km
from the nearest mapped plate boundary, between the Pacific and Juan de Fuca plates. Earthquakes cluster along boundaries like this one, where plates collide, pull apart or slide past each other.
Depth: shallow
8 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 M2.9 on June 2, 1995. 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 164 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 · 87 km N of this epicenter
- 7.2The 1992 Petrolia, California EarthquakeApril 25, 1992 · 118 km E of this epicenter
- 7.2The 1980 Eureka, California EarthquakeNovember 8, 1980 · 139 km NE of this epicenter
- 7.1The 1923 Humboldt County, California EarthquakeJanuary 22, 1923 · 50 km E of this epicenter
- 7.1121 km W of Ferndale, CaliforniaSeptember 1, 1994 · 5 km W of this epicenter
- 7.0136 km WSW of Brookings, OregonAugust 17, 1991 · 143 km N of this epicenter
- 6.9103 km W of Pistol River, OregonJuly 13, 1991 · 198 km N of this epicenter
- 6.8123 km W of Ferndale, CaliforniaNovember 25, 1954 · 9 km NW of this epicenter
History · NOAA
Deadliest earthquakes in this area
NOAA’s significant-earthquake database lists 15 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 2 recorded deaths. The most severe:
- 1954M6.6
Humboldt County
21 Dec 1954 · 153 km away
1 death$2 million damage
- 1932M6.5
Eureka
6 Jun 1932 · 118 km away · intensity VIII
1 deathModerate damage ($1–5M)
- 1992M7.1
Humboldt County: Ferndale, Petrolia
25 Apr 1992 · 110 km away · intensity VIII
$75 million damagetsunami
- 1980M7.2
North Coast
8 Nov 1980 · 139 km away · intensity VII
$2 million damage
- 1991M6.2
Honeydew, Whitethorn, Petrolia
17 Aug 1991 · 109 km away · intensity VII
Moderate damage ($1–5M)
- 1994M5.5
Eureka, Samoa, Arcata, Blue Lake
26 Dec 1994 · 116 km away · intensity VII
$2 million damage
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.