Category Archives: mendocino

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: 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

Mendocino fault earthquake!

We just had a M = 4.3 earthquake along the Mendocino fault zone. Here is the USGS website for this earthquake. There were some earthquakes of similar magnitude along the MF recently in January 2014 and April, 2015. This earthquake … Continue reading

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

Cascadia subduction zone: Tectonic Earthquakes of the Pacific Northwest

IRIS and the US Geological Survey have recently produced an educational video about tectonic earthquakes in the region of the US Pacific Northwest. The project was funded by the National Science Foundation. The Video YT link for the embedded video … Continue reading

Posted in cascadia, College Redwoods, earthquake, education, geology, gorda, HSU, humboldt, mendocino, mendocino, oregon, pacific, plate tectonics, strike-slip, subduction, Transform, tsunami

Plate Tectonics: 200 Ma

Gibbons and others (2015) have put together a suite of geologic data (e.g. ages of geologic units, fossils), plate motion data (geometry of plates and ocean ridge spreading rates), and plate tectonic data (initiation and cessation of subduction or collision, … Continue reading

Posted in alaska, asia, cascadia, College Redwoods, collision, education, europe, Extension, geology, gorda, HSU, humboldt, Indonesia, Japan, kinetic, mendocino, oregon, pacific, plate tectonics, San Andreas, strike-slip, subduction, sumatra, Transform

Earthquake between the San Andreas and Maacama!

Saturday morning (2015.08.29), residents in Fort Bragg were awakened by a M 3.6 earthquake along a fault that lies between the San Andreas fault (SAF) to the west and the Maacama fault (MF) to the east. Here is the USGS … Continue reading

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

Gorda plate earthquake: 2010 zone strikes again

Early this morning we had a small rumbler offshore of northern California, generally in the same location as the 2010.01.10 earthquake. I remember the 2010 earthquake very well as the ground shaking lasted over 20 seconds in Manila. Here is … Continue reading

Posted in cascadia, Chemeketa Community College, education, geology, HSU, humboldt, mendocino, strike-slip

Mendocino fault Earthquake

This sure looks like an earthquake on the Transform Plate Boundary fault system known as the Mendocino fault. I have plotted the moment tensor for this earthquake. The shaking intensity contours are plotted. Here is the USGS web page for … Continue reading

Posted in cascadia, Chemeketa Community College, earthquake, education, geology, HSU, humboldt, mendocino, plate tectonics

Blanco fracture zone strikes again

The Blanco fracture zone (BFZ) is a transform plate boundary that connects the Juan de Fuca ridge with the Gorda rise spreading centers. This active fault zone consists of numerous right-lateral (dextral) faults. There is some debate as to how … Continue reading

Posted in cascadia, Chemeketa Community College, earthquake, education, geology, HSU, humboldt, mendocino, oregon, plate tectonics, subduction, Transform

Mendocino fault earthquake

We had a small magnitude earthquake “today” along the Mendocino fault system approximately 150 km west of Cape Mendocino. Here is the USGS web page for the Mw 4.8 earthquake. Based upon the tectonic setting, the hypocentral depth, and the … Continue reading

Posted in cascadia, Chemeketa Community College, College Redwoods, earthquake, education, geology, HSU, mendocino, plate tectonics, San Andreas, subduction, Transform