2/21/2017 — Nightly Earthquake Update + Forecast — California struck near San Francisco as expected

A noteworthy M4.2 (M4.5) earthquake struck North of San Francisco near Clear Lake Volcano / Geysers, CA.

Above: February 20, 2017 – A M4.2 earthquake strikes North California near Geysers, CA.


The earthquake forecast specifically called for M5.0 range activity to strike North-central California.

Now North California has been struck has been struck as expected.

Watch the video update here:



2017-02-21 00:57:52 UTC
38.796°N   122.734°W
0.9 km depth


Magnitude 4.2 mw
Location/uncertainty 38.796°N 122.734°W± 0.1 km
Depth/uncertainty 0.9 km± 0.3
Origin Time
Number of Stations 48
Number of Phases 44
Minimum Distance 1.4 km (0.01°)
Travel Time Residual 0.08 s
Azimuthal Gap 29°