This is a tale of two earthquakes. They were the same in that they had shaking on basins and the pgv was mostly 20-40 cm/s except right on top. I talk in absolute terms for 80-90% confidence, which is much more restrictive that most media. As always, I expect that nobody will read this.
Forget the 'Double Tap Crap', this was a standard M8, 100 km long. They always rupture in fits and starts, and this was well within the norm. The USGS should not have declared it two earthquakes, a big math error, caused by AI.
Like I've said, the USGS has a model of two steel plates releasing energy, formulated during the steam era. Totally wrong. In fact, the rupture resembles an excavation into stressed rock. The strength of the fault has always been near-zero, and it goes to zero in an earthquake. I liken this to a recurring volcano. They are finally starting to see my side, that the magma is resting in a solid container, formed by rock arching, or a hole in the stress. The next outburst does not come from some sealed-off intake, but from the failure of that stress arching. Easily measured, and they have done some. I have the curse of always being right, and never believed. All influencers are the other way round, with lots more money.
This is now the same for this earthquake. All that crap about the fault 'nearing the highest stress in 1000 years' is crap. In 100 years, there may be another earthquake down the railway tracks, but not here. However, they are on a jelly basin, and must use screw piles, real concrete, and tied-in steel.
Not such a happy picture for the Philippines. The mechanics of the stress distribution puts increased thrust on the next section, but not on the fault. We can expect failure and whoosh goes the fault down the tracks. This was the mechanism for the Christchurch earthquakes.
As for impact on a place already smashed, it might be little or none, or lots. The seismic motions will be a tiny bit smaller, but many buildings are softened but unrated. As with the other quake, everybody will go happy-happy into their 'undamaged' building, and smack! Again, the only way to handle this is as I said with ven. Also, follow my guidelines in my best-seller book: "So, You Don't Wanna be a Pancake". Coming out soon.


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