Wednesday, January 6, 2016

[californiadisasters] Earthquake Report: Cape Mendocino!



Earthquake Report: Cape Mendocino!


20160107_cape_mendo_interp_thumb

We just had a pair of earthquakes near the town of Petrolia (first oil well in CA drilled here, ergo the name). The first one I did not feel, but I did feel the quick jolt of the second one.

    Here are the USGS websites for these earthquakes:
  • 2016.01.07 M 3.3
  • 2016.01.07 M 4.3

I will update this later, but for now, here is a map that shows the epicenter for these two earthquakes. I include the focal mechanism for the M 4.2 earthquake. The 3.3 was initially a 3.1 and the 4.2 was initially a 4.3. Interesting that we have had a number of earthquakes in this region, that have strike-slip senses of motion, probably associated with the Mendocino fault. If we get a moment tensor, it might show that this is also a strike-slip earthquake. We will just need to wait and see. Sometimes focal mechanisms and moment tensors show different types of earthquake motions.


Funny, when the first quake hit, the USGS had a ? for the magnitude. Here is a screenshot evidence of that.


Speaking of MF earthquakes in this region, there was a swarm in January of 2015

Here is my report that shows the seismicity aligning with where the MF may exist. Below is a map from that series of quakes.


Here is a summary of recent seismicity for this region, along with a couple summaries for Cascadia in general.


Source: http://earthjay.com/?p=3518


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Posted by: Kim Noyes <kimnoyes@gmail.com>


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