The June 3, 1968 earthquake
M5.0near Plush, Oregon
A magnitude 5.0 earthquake 12.4 miles deep, centred in Lake County. The 8th strongest in Oregon’s record since 1900, and the strongest within 50 miles since a magnitude 5.1 on May 29, 1968. 3 aftershocks of magnitude 2.5 or more followed within 30 days.
The earthquake
- Magnitude
- 5.0
- body-wave magnitude (mb)
- Depth
- 12.4 mi
- 20.0 km below the surface
- Local time
- Monday, June 3, 1968
- 06:27 PDT; 13:27 UTC
- In Oregon’s record
- 8th
- strongest of 861 since 1900
USGS ANSS Comprehensive Earthquake Catalog, event ushis3009 (“25 km SSE of Plush, Oregon”). The USGS event page carries the ShakeMap, felt reports and the official summary.
Aftershocks
Earthquakes of magnitude 2.5 or more within 20 miles of the epicentre in the 30 days after.
3
Aftershocks in 30 days
4.7
Largest aftershock, Jun 4, 1968
2
On the first day
1
In the 7 days before
- The search radius is the surface rupture length expected for an earthquake of this magnitude (Wells and Coppersmith, 1994), at least 20 and at most 600 miles, so a great earthquake's sequence is counted along its whole fault.
- Before the modern seismic networks of the 1970s many small aftershocks went unrecorded, so early sequences read short.
Counties and cities within 50 miles
Distance from the epicentre to each county boundary (zero when inside) and to each city centre.
Counties
- Lake CountyOR · inside
- Washoe CountyNV · 17.5 mi
- Modoc CountyCA · 17.5 mi
- Harney CountyOR · 26.7 mi
- Humboldt CountyNV · 28.2 mi
Earthquakes around the epicentre
345 earthquakes of magnitude 3 or more within 50 miles of this epicentre since 1973.
Earlier earthquakes of magnitude 5 or more within 50 miles, strongest first
- May 29, 1968M5.1
- January 10, 1923M5.0
USGS ANSS Comprehensive Earthquake Catalog. Local time is the time zone of the county nearest the epicentre. Magnitudes are as the catalogue reports them.