M6.9 Central Mid Atlantic Ridge -- NOW

davenn · Sep 18, 2020

This Mw 6.9 is a bit east and on a parallel transform fault section to the Mw 6.5 that I posted around 2.5 weeks ago

It's coming in on my seismo now
http://www.sydneystormcity.com/seismograms.htm

USGS info ..
https://earthquake.usgs.gov/earthquakes/eventpage/us7000bf3k/executive

The moment tensor "beachball" shows that it isn't a pure strike-slip motion
and that there is just a little amount of oblique slip motion as well.

Satellite-style map of the mid-Atlantic seafloor off NE Brazil, with red lines marking transform fault traces and yellow lines marking ridge segments, and two white markers labeled Mw 6.5 and Mw 6.9.

cheers
Dave

davenn · Sep 18, 2020

A seismogram download after about 1.5 hours of signal received
There is around 40 minutes separation between the arrival of the P wave and the arrival of the Surface waves
The surface waves continued for over an hour ( I saved the image just before the surface wave train was about to over write the
first surface wave arrival)

Seismogram trace plot in twenty-four hourly rows from 00:00 to 22:00 with dashed vertical lines; a small spike near 16:00 and a large irregular wave train at the bottom from about 22:00 onward, with a footer reading Maximum Velocity 5785.94nm at 09/18 23:07:42 and Start Date 09/17/20 UTC Channel ZHI BHZ DNSO, Sydney, NSW, Australia.

M6.9 Central Mid Atlantic Ridge -- NOW

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