5/20/2016 — West Coast United States / Oregon struck by M4.9 (M5.0) earthquake

A noteworthy M4.9 earthquake has struck off the West coast of the United States (Pacific Northwest / Oregon).

west coast oregon earthquake may 20 2016

It has been several weeks (going into months) since we’ve seen this size earthquake occur off the West coast of the United States.


This earthquake was expected, and forecast to occur.

See the earthquake forecast video issued for this week.  The forecast specifically warned the coast of Oregon for M4.0 to M5.0 earthquake activity to strike.


As the above video explained roughly 3-4 days ago, we were watching the coast of Oregon based upon the movement occurring in other nearby areas.

Swarms of earthquakes struck at dormant volcanoes up the coast preceding this event.  These volcanic earthquakes are always a warning sign of coming larger release off the coast.


Information on this earthquake from the USGS:

Magnitude/uncertainty 4.9 mb± 0.0
Location/uncertainty 43.965°N 127.921°W± 8.3 km
Depth/uncertainty 10.0 km± 2.0
Origin Time
Number of Stations
Number of Phases 121
Minimum Distance 312.6 km (2.81°)
Travel Time Residual 0.98 s
Azimuthal Gap 199°