Thank you for sharing this, Eric! So happy to see NiSAR helping the community in action.

This is very cool! Thanks for sharing. There are a lot of coda waves. Are the coda generated by the 3D velocity structure near the source? One impression I have after analyzing the seismogram of this earthquake is that it is more complicated than normal.

Hi Edwin, just in case you haven’t seen (you probably have), do you think your structural complexity explanation could be related to the complex fault geometry around that “gap” shown in this screenshot? It is from Gabriela Quintana Sánchez on LinkedIn. @faultydata.bsky.social

But these are just my thoughts, let me know what you think of it. It is a confusing situation but I feel that we could learn a lot from it.

Third, two events’ waveforms overlap and the duration of total P wave train is long, but not abnormally long. So although there may be some slow down of the rupture. There is likely no a completely stop and restart of the rupture. Scientifically, I think a single event may be a better description.

And second, when I go look at back-projection results, finite fault, and InSAR results, I would say this is one event. There are probably two stand-alone high-slip/radiation energy patches, but we see those in other earthquakes as well, which are mostly characterized as one event.

Yes, I agree. The scientific question is what I’ve been following in the past two days. There is some issue with the two events description. First, when I go look at the waveforms where the USGS report seeing a pick for the second M7.5 event, It is definitely imaginable, but they are not clear.

So to clarify, my “Seems like a normal SINGLE event with multiple asperities” statement is not solely based on this Peking University finite fault model. And I am not saying this model is correct 100%. But this is another evidence that is consistent with the multi-asperity picture to 1st order.

Thank you for explaining Morgan. I should be more careful in saying what I said. The statement about multi asperity in a single rupture is a synthesis after I seeing several other dataset and analysis from multiple groups, including finite fault, back-projection, C and L band InSAR. aftershocks.

You explained well, Harold. Thanks for doing this for NBC. The "two-event" story is confusing.

added magnitude - circle size correspondence.

Morrocoy Fault causing complexity? @faultydata.bsky.social

We may actually test that! I think the InSAR data should have enough
resolution to see depth segmentation, right?

These are useful information. Thanks for sharing, Brandon.

That’s true, I think the fault looks smooth based on the NiSAR and Sentinel-1 InSAR results. But the onshore displacement at around Longitude -68 to -67 is smaller than other place; is there where you think the unusual structure complexity is?