You don't expect these at a subduction zone, but that means the oceanic crust is smashing into Chile, and causing compression. Had it been near the capital we would have confirmed a very high PGV, but we can't tell here.
Add: busgus reporting a very high intensity. Only adobe houses, so I don't know what they are working with. The hammer zone was right on land, but there may be no houses there. Had it been measured, it would have been a world record, and I would be proven right again. :) No such luck.
Add2 - m7 aftershock, hope they had an accelerometer in for that one.
OMG- I'm at the cottage and my brain is fried. The focal mechanism looks like an every day subduction quake, and there could be just the normal 20 cm/s, which would knock down any adobe house. Forget all that thrust hammer talk, I'm just so ashamed. :)
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