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Jascha Polet
I've updated the seismicity map with aftershocks of today's M7.7 earthquake in Caribbean in purple. All are to West of mainshock epicenter & most clustered at about 200 km, suggesting rupture propagated to West & has length of ~200 km (expected for M7.7).
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Jascha Polet Jan 28
Replying to @CPPGeophysics
Also note that this rupture would fall inside the seismic gap here, the area of the fault without any earthquakes prior to this large event. This is similar to the earthquake in Turkey a few days ago.
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Wang Yu Jan 28
Replying to @CPPGeophysics
Another typical “seismic gap” example
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Jascha Polet Jan 28
Replying to @Wangyu_1979
Yes, that was going to be my follow-up tweet!
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GoneToPlaid Jan 28
Replying to @CPPGeophysics @jccwrt
I would love for you explain in layman's terms what the beach balls show. I vaguely know that they are tensors and directions, yet I have know idea how they relate to changing stress and shear forces, or whatever the correct terminology is.
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Jascha Polet Jan 28
Replying to @GoneToPlaid @jccwrt
My students find these videos and animations useful:
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M. Teresa Ramírez-H. Jan 28
Replying to @CPPGeophysics
Thank you , I also like that you call this Caribbean, and not Jaimacan, event, since this event and aftershocks actually occurred in the Caribbean region as reported by the @USGSBigQuakes USGS
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Rodrigo León Jan 28
Replying to @CPPGeophysics
Amazing map, as usual 👍🙌
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