For fixed locations, there are cheap P-wave detection earthquake alarms based on mechanical pendulums that will give seconds of warning. Example: https://www.a

For fixed locations, there are cheap P-wave detection earthquake alarms based on mechanical pendulums that will give seconds of warning. Example: https://www.amazon.com/dp/B001D8NMY4 https://www.amazon.com/dp/B001D8NMY4 Also, cat alarms: https://youtu.be/VJ-p9qOhBv4 https://youtu.be/VJ-p9qOhBv4