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Google's Android Earthquake Alert failed' to detect north India tremors today. Why?

https://www.hindustantimes.com/technology/googles-android-earthquake-alert-failed-to-detect-north-india-tremors-today-why-101696336054589.html

The service was launched in the country on September 27.

The Android Earthquake Alert system failed to detect recent tremors in north India, possibly due to its recent launch and gradual rollout to Android 5+ users in the country.
The system utilizes accelerometers in Android smartphones to function as mini-seismometers, identifying potential earthquakes when multiple phones detect simultaneous shaking.
Once an earthquake is detected, the system sends advance warnings to nearby Android handsets. The feature was recently made available in local languages in India.
However, the system has limitations including the inability to detect all earthquakes, and errors in estimating magnitude and shaking intensity.
Usage of this feature requires Wi-Fi and/or cellular data connectivity, with both Android Earthquake Alerts and location settings enabled.

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I used to years ago, in the era of Galaxy S2 and such when battery life was a luxury.

I can't think of a time in recent years where I've seen anyone doing that TBH. I know certain people who turn off the wifi router during bedtime.

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Same here. I used to do it when location permissions weren't as robust as well. I don't bother anymore.