Blanco Fracture Zone Earthquakes!

This morning we had three earthquakes related to the Blanco fracture zone, a transform (shear) plate boundary. These earthquakes occurred quite a bit north of the bathymetric expression of the BFZ (though the M 5.8 is actually plotting closer to the BFZ this morning), similar to the seismicity earlier this year to the southeast of today’s swarm. Here is a post regarding the seismicity along the BFZ in April 2015.

Here is a map showing these earthquakes, with moment tensors plotted for the M 5.8 and M 5.5 earthquakes. I include an inset map showing the plate configuration based upon the Nelson et al. (2004) and Chaytor et al. (2004) papers (I modified it). I also include a cross section of the subduction zone, as it is configured in-between earthquakes (interseismic) and during earthquakes (coseismic), modified from Plafker (1972).


Here is a version of the CSZ map alone (Chaytor et al., 2004; Nelson et al., 2004).

Here is a version of the CSZ cross section alone (Plafker, 1972).

Here is a map showing the BFZ seismicity from April 2015.

Category(s): cascadia, Chemeketa Community College, education, geology, HSU, humboldt, plate tectonics, strike-slip, subduction, Transform

4 Responses to Blanco Fracture Zone Earthquakes!

8 Responses in other blogs/articles

  1. […] earthquakes plotted in the map and animations below. Here is the page that I posted regarding the beginning of this swarm. Here is a post from some earthquakes last year along the […]

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  8. […] 2015.06.01 M 5.8 Blanco fracture zone p-1 […]

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