It was a large earthquake for the media, but we know that ground motion (pgv) in units of cm/sec is what counts.
If you look at the picture of the one house that collapsed, you see a whole bunch of equally poorly constructed buildings that are okay. That probably means that the pgv is only a few cm/sec.
Taiwan has instruments everywhere, so we'll soon find out what it was. An M7ish earthquake is small for this area, and there is a 1% chance it is a foreshock for an 8 or 9.
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