Thursday, January 7, 2016

Re: [californiadisasters] Earthquake Report: Cape Mendocino!



Ok, I'll go back to using small words and speaking slowly...



On 1/7/2016 12:44 AM, Kim Noyes kimnoyes@gmail.com [californiadisasters] wrote:
 
That is not my blog but rather that of a paleo-seismologist I just discovered earlier tonight!

On Thu, Jan 7, 2016 at 12:24 AM, Rick WA6NHC wa6nhc@gmail.com [californiadisasters] <californiadisasters@yahoogroups.com> wrote:
 

My my, our little Kimmy has learned to use some big words of tectonic mechanics!  Just look how far he's come; we're all so darned proud of him  :-P

It was a good day for >3.0 quakes ...  but no "San Andreas" event (funniest movie of the year, I laughed ALL the way through it, just SO stupid!).  My only concern is that the rain soaked surface soils may slip more than usual, the standard mixed blessing.


On 1/6/2016 10:50 PM, Kim Noyes kimnoyes@gmail.com [californiadisasters] wrote:
 

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.






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Posted by: Rick WA6NHC <wa6nhc@gmail.com>


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