Category Archives: Geology

M 3.5 near Castaic, CA – Updated

This morning (2/21/2020) at 5:42 am, a small earthquake struck the Castaic area north of Los Angeles. Just looking at the maps, it seems near the San Gabriel Fault but it is a somewhat complex area. It was also a very deep earthquake as they go, 18.1 km. Shaking was felt in a wide area but wasn’t very strong.

Shake map for the earthquake. Now a M 3.5.

For more information, check out the USGS Summary Page of the event.

https://earthquake.usgs.gov/earthquakes/eventpage/ci39079535/executive

M 3.6 – 4km NNE of Granada Hills, CA

Shakemap from USGS showing the extent of shaking and major fault lines

On January 21, 2020, just a few days after the 26th anniversary of the Mw 6.7 Northridge Earthquake, we had another small jolt strike the San Fernando Valley. This one, while small, was felt over a wide area. If you are among the many that did feel it, the USGS wants to hear from you! These “Did You Feel It?” reports help them to understand earthquakes further.

Ridgecrest – Part 2 Now Online

Part 2 of my Ridgecrest earthquake field trip is now online. This time, I also won’t forget to add a link!

Ridgecrest – Part 1

Finally posting the photos from my August 22, 2019 Ridgecrest trip. Part 1, which covers the fault rupture, is finally up. Part 2, which will cover the problems in Poison Canyon and Trona, are coming soon!

Seismographs Online

The California Integrated Seismic Network has an online feed showing seismographs throughout southern California.

http://www.scsn.org/index.php/earthquakes/live-seismogram-feed/index.html