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Monthly Archives: January 2015
Earthquake along the South New Hebrides trench
We just had a swarm of shallow seismic activity along the arc above the South New Hebrides trench. The largest magnitude was a Mw 6.0. There was a very deep (~220km) Mw 6.8 just to the north about a week … Continue reading
Posted in Chemeketa Community College, earthquake, education, geology, plate tectonics, subduction, Transform
Stress Changes from Strike Slip Faults
One may ask what are the relations between the Mendocino fault (MF) and the Cascadia subduction zone (CSZ). Earthquakes on both fault systems are responding to the same plate motions. As the Gorda plate moves to the east, relative to … Continue reading
Mendocino fault Aftershocks: Update
The aftershocks continue following the Mw 5.7 mainshock earthquake swarm along the Mendocino fault. Yesterday I plotted my interpretation for the location of the fault that this swarm may have ruptured upon. Some epicenters have been relocated and appear to … Continue reading
Posted in cascadia, Chemeketa Community College, earthquake, education, geology, humboldt, mendocino, plate tectonics
Mendocino fault earthquake 1/28/15 1:08 PM local time
We just had a good sized shaker, probably on the Mendocino fault system. Today’s earthquake occurred on 1/28/2015 at 1:08 local time. The mainshock, an earthquake of magnitude Mw = 5.7, has an epicenter approximately 20 km due west of … Continue reading
Cascadia’s 315th Birthday
On this morning, 315 years ago, the Cascadia subduction zone fault ruptured as a margin wide earthquake. I here commemorate this birthday with some figures that are in two USGS open source professional papers. The Atwater et al. (2005) paper … Continue reading
Posted in cascadia, Chemeketa Community College, education, geology, humboldt, plate tectonics, subduction, tsunami