The Intensity (human feeling) at Taipei is just Lv.3 (because epicenter is almost 250km or 161 miles away), which means "Almost everyone will feel shaking, and some may experience fear"[1]. Such degree is not very rare at Taiwan, so most people will just act as "hmm", "OK fine".
Also after the 921 Earthquake[2], Taiwan raise earthquake-resistant structures standard, therefore most new buildings will be fine under 5 or 6 Intensity.
That would be pretty dumb in reality, but I wonder if it could be made to work... you'd need some kind of synchronisation control on the ingress to ensure people enter the slide with sufficient clearance before/ahead of them, and you'd have to have a "mantrap" type arrangement at the ingress points to prevent multiple people cramming in at once and risking a jam. You'd also want to neck the entrances down to about 3/4 of the tunnel diameter to stop overly large persons from entering the slide.
Probably also want some kind of low-friction mat at the exit point so people aren't piling up at the bottom of the slide and blocking it if they can't move fast enough.
The second I felt, wife was scared. 4yo on bed watching tv didn’t even notice it.