Category Archives: gorda

Earthquake Report: Petrolia (CA)

This morning there was a good shaker that was widely felt across the region. I did not feel it. I was probably driving at the time, or grading papers, which can have the same sense-deadening effect. Here is the USGS … Continue reading

Posted in cascadia, earthquake, education, geology, gorda, HSU, mendocino, pacific, plate tectonics, San Andreas, strike-slip, Transform

Earthquake Report: Mendocino fault!

Yesterday there was an earthquake along the eastern extension of the Mendocino fault system. This magnitude M = 4.1 earthquake (here is the USGS website for this earthquake) is a small magnitude, but it was widely felt. I was in … Continue reading

Posted in cascadia, earthquake, education, geology, gorda, HSU, humboldt, mendocino, mendocino, pacific, plate tectonics, strike-slip

Earthquake Report: Gorda Plate!

Last night, while I was preparing an online exam for my students to take while I am at the Geological Society of America Annual Meeting in Denver Colorado, there were a couple earthquakes in the Gorda plate offshore of northern … Continue reading

Posted in cascadia, earthquake, education, geology, gorda, HSU, humboldt, pacific, plate tectonics, strike-slip, subduction

Earthquake Report: Bayside (northern California): Update #1

So, I put together another map with today’s earthquake in context with the historic seismicity and some other factors. Now the USGS magnitude is M = 4.7 and there is a moment tensor for this earthquake (that looks very similar … Continue reading

Posted in cascadia, earthquake, education, geology, gorda, HSU, humboldt, pacific, plate tectonics, strike-slip, subduction, tsunami

Earthquake Report: Bayside (northern California)

Well, after installing a stilling basin for our new tide gage installation at Trinidad, CA, I was napping in my upstairs bedroom in Manila, CA. I was awakened by a short (2-3 second) short shaking earthquake. Turns out it was … Continue reading

Posted in cascadia, geology, gorda, HSU, humboldt, plate tectonics, strike-slip, subduction, tsunami

Earthquake Animation: Gorda Plate 1900-2016 M >+ 4.5

Following the earthquake pair today, I put together an animation showing the seismicity for this region between 1900 and 2016.01.30. I searched the USGS NEIC database for earthquakes of magnitude greater than or equal to M = 4.5. Here is … Continue reading

Posted in cascadia, College Redwoods, earthquake, education, geology, gorda, HSU, plate tectonics

Earthquake Report: Gorda!

There was just a pair of earthquakes near the Gorda rise. There was first an earthquake of magnitude M = 5.0, followed by a M = 4.9. The 5.0 appears to be within the GP, but the 4.9 seems to … Continue reading

Posted in cascadia, College Redwoods, earthquake, education, Extension, geology, gorda, HSU, humboldt, pacific, plate tectonics, strike-slip, Transform

Cascadia subduction zone: 316 years ago tonight!

In commemoration of the last known Cascadia subduction zone earthquake, I present a summary background material here. Since last years commemoration, there have been a few additions. I made some updates on 2018.01.26. Most notably was a pair of articles … Continue reading

Posted in cascadia, College Redwoods, education, geology, gorda, HSU, humboldt, Japan, pacific, plate tectonics, subduction, tsunami

Hoax Alert: Cascadia Buoy!

Today there was a bantering about a buoy several hundred miles offshore of Oregon. A website had posted a hoax about how the buoy data suggested that there was movement along the Cascadia subduction zone. These hoaxes happen rather frequently. … Continue reading

Posted in cascadia, College Redwoods, earthquake, education, geology, gorda, HSU, humboldt, pacific, plate tectonics, subduction, tsunami

Earthquake Report: Mendocino fault and Gorda plate!

We just had an earthquake along strike with the Mendocino fault zone. This region is seismically active and there were a number of MF earthquakes in 2015. Here is the USGS web page for today’s M = 4.5 MF earthquake. … Continue reading

Posted in cascadia, College Redwoods, earthquake, education, geology, gorda, HSU, humboldt, mendocino, mendocino, plate tectonics, strike-slip