Reviewed by USGSCalifornia33y ago
M2.9 earthquake 12 km NE of Phillipsville, California
Monday, July 5, 1993, 06:16:27 UTC · 40.295°N, 123.697°W
A magnitude 2.9 earthquake struck 12 km NE of Phillipsville, California on Monday, July 5, 1993, 06:16:27 UTC, at a depth of 24.4 km (shallow).
- Magnitude
- 2.9
- Minor · md
- Depth
- 24 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
304 kg of TNT
That is about 1/49,470 of the Hiroshima bomb. A magnitude 5.0 releases about 1,567 times more energy.
Tectonic setting
54 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
24 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 1 M2.5+ earthquake within 50 km in the following 30 days; the largest was M3.0 on July 21, 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 139 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:
- 7.9The 1906 San Francisco, California EarthquakeApril 18, 1906 · 300 km S of this epicenter
- 7.4123 km W of Big Lagoon, CaliforniaJanuary 31, 1922 · 189 km NW of this epicenter
- 7.2The 1992 Petrolia, California EarthquakeApril 25, 1992 · 45 km W of this epicenter
- 7.2The 1980 Eureka, California EarthquakeNovember 8, 1980 · 103 km NW of this epicenter
- 7.1The 1923 Humboldt County, California EarthquakeJanuary 22, 1923 · 115 km W of this epicenter
- 7.0136 km WSW of Brookings, OregonAugust 17, 1991 · 238 km NW of this epicenter
- 6.9103 km W of Pistol River, OregonJuly 13, 1991 · 265 km NW of this epicenter
- 6.8123 km W of Ferndale, CaliforniaNovember 25, 1954 · 171 km W of this epicenter
History · NOAA
Deadliest earthquakes in this area
NOAA’s significant-earthquake database lists 27 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 5 recorded deaths. The most severe:
- 1993M6.0
Klamath Falls
21 Sep 1993 · 265 km away · intensity VII
2 deaths$8 million damage
- 1969M4.8
Santa Rosa
2 Oct 1969 · 221 km away · intensity VIII
1 death$8 million damage
- 1954M6.6
Humboldt County
21 Dec 1954 · 63 km away
1 death$2 million damage
- 1932M6.5
Eureka
6 Jun 1932 · 69 km away · intensity VIII
1 deathModerate damage ($1–5M)
- 1992M7.1
Humboldt County: Ferndale, Petrolia
25 Apr 1992 · 53 km away · intensity VIII
$75 million damagetsunami
- 1980M7.2
North Coast
8 Nov 1980 · 103 km away · intensity VII
$2 million damage
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.