Category Archives: humboldt

Earthquake Report: Mendocino fault!

Well, I felt that one. The shaking lasted about 5-7 seconds in Manila, CA (where I live). Here is the USGS website for this M = 5.6 earthquake. This earthquake appears to have occurred along the Mendocino fault, a right-lateral … Continue reading

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

Earthquake Report: Bartlett Springs fault system, Lake Pillsbury

We just had a good sized earthquake adjacent to the mapped surface trace of the Bartlett Springs fault, southeast of Lake Pillsbury. Here is the USGS website for the M 5.1 earthquake. Here is my interpretive map that shows the … Continue reading

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

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

Friends of the Arcata Marsh 2016.07.22

I present material about the Cascadia subduction zone for the Friends of the Arcata Marsh (FOAM) held on 7/22/16 at the Arcata Marsh Interpretive Center. This page has some supporting material from this presentation, including the digital presentation file. The … Continue reading

Posted in cascadia, earthquake, education, geology, HSU, humboldt, plate tectonics, subduction, tsunami

Cascadia subduction zone: M 9.0 tsunami simulation video

NOAA Center for Tsunami Research just released an animation that shows a numerical simulation of what a tsunami may appear like when the next Cascadia subduction zone earthquake occurs. I present a summary about the CSZ tectonics on a 316th … Continue reading

Posted in cascadia, College Redwoods, education, geology, HSU, humboldt, tsunami

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

Cascadia Update: new tsunami simulation!

The NOAA/NWS/Pacific Tsunami Warning Center has updated their animation of the simulation of the 1700 “Orphan Tsunami.” Source: Nathan C. Becker, Ph.D. nathan.becker at noaa.gov I provide some other background information about Cascadia here: Cascadia’s 315th Anniversary 2015.01.26 Earthquake Information … Continue reading

Posted in cascadia, College Redwoods, education, geology, HSU, humboldt, pacific, 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