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A comment on Tuned Mass Damper of Taipei 101. Parent comment

Re:Tuned Mass Damper of Taipei 101 by daiamid on Monday September 19, 2022 @03:16AM (#32895276)
Taiwan uses Richter magnitude, USGS uses Moment magnitude.

6.8 and 6.9 are both right, just different unit.

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Re:Tuned Mass Damper of Taipei 101 by graderjs on Monday September 19, 2022 @08:04AM (#32897184)
Alright, fine. Thanks for educating me. I was wondering about this quite a lot: some places, like USGS said 6.9, while some news articles said 6.8.

Also, another thing: why does an earthquake often have an initial magnitude that then changes over time? Like I think the initial ping for this was a 7.2, like take a look at this prelim from USGS:

https://twitter.com/USGSted/status/1571394895075500032

How can it be OoM off at first?

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