M6.9 Central Mid Atlantic Ridge -- NOW

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SUMMARY

The Mw 6.9 earthquake located east of the Central Mid Atlantic Ridge is associated with a parallel transform fault section to a previous Mw 6.5 event reported two weeks prior. Real-time seismogram data can be accessed at Sydney Storm City, and detailed information is available through the USGS event page. The moment tensor analysis indicates that the earthquake features oblique slip motion rather than pure strike-slip motion. Notably, there is a 40-minute gap between the arrival of the P wave and the Surface waves, with the latter persisting for over an hour.

PREREQUISITES
  • Understanding of seismic wave types, specifically P waves and Surface waves.
  • Familiarity with moment tensor analysis in seismology.
  • Knowledge of earthquake magnitude scales, particularly the Mw scale.
  • Experience with accessing and interpreting seismogram data.
NEXT STEPS
  • Research the implications of oblique slip motion in seismic events.
  • Learn how to interpret moment tensor "beachball" diagrams.
  • Explore the differences between strike-slip and oblique slip faulting.
  • Investigate real-time seismogram analysis techniques and tools.
USEFUL FOR

Seismologists, earthquake researchers, and students studying tectonic activity will benefit from this discussion, particularly those interested in real-time seismic data analysis and fault mechanics.

davenn
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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.

20200830 - 0918 UT Mw 65 and 6.9, cntrl MAR.jpg

cheers
Dave
 
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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)

200918 UT Mw 6.9 cntrl MAR zhi 2a.gif
 

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