How much earlier would you like to be warned, and how would you suggest that be achieved?
AFAIK, all existing warning systems rely on detecting the earthquake when it’s actually happening, and Japan is a lot longer and wider than Taiwan (the time needed for S waves to travel between Yilan and Taipei, say, seems to be around 7-8 seconds, which doesn’t leave much scope for advance warning). You could argue that it might be useful to have more sensors, especially ocean floor sensors off the east coast, but there’s a limit as to how much warning can reasonably be achieved.
That sounds impressive. Aren’t the earthquakes in Japan often more intense though? And again, Japan is a fair bit bigger so presumably has a larger network of land-based sensors to provide the advance warning.
Last year there was a big quake in taipei (the one where the roads apparently split and a couple buildings tilted over). The warning came about 4-5 seconds before the shaking started and it was fairly large. It gave me enough time get to the front door (i was on first floor) by the time the horizontal shaking started and out the door by the time the vertical wave hit.
Almost knocked off my feet by the vertical wave to be honest, but yeah. I appreciated the warning.
Clarification by the CWB on why there were no alerts for the happy trampoline time last night:
The alerts are guided by 2 sets of readings, where the first is magnitute and second specifically magnitude of when it hits land in TW. Last night the magnitude was above 5 but the way it ‘felt’ didn’t exceed a 4, so no alerts were triggered.
I’m in yilan. The bed felt like it was swaying slightly, but not by much. Felt like the rocking when you get up from bed. I went online to earthquake detectors to see if anything reported. Nothing.
Thought I was imagining it. Wasn’t until 20-30 minutes later they they appeared on the websites.
If you’re inside when an earthquake strikes stay inside, if you’re outside stay outside, as far from buildings and things which could fall on you as possible. Racing to get outside just adds to whatever potential danger existed.
If this phenomenon could somehow be harnessed, or at the very least looked out for and the public notified if it were to happen in a time like this in which a quick succession of 5+ magnitude quakes could very well be precursors to a Big One…