4 ms·
In Japan, the alert is accompanied with magnitude and epicenter information. This alert seems to be also distributed by broadcast SMS. Apps on the phone deter
by jac_no_k 12y ago
In Japan, the alert is accompanied with magnitude and epicenter information. This alert seems to be also distributed by broadcast SMS. Apps on the phone determine if it crosses a threshold to alert or not. Even after the shaking has started, it's good to know just how strong it will be. So if it's 3am, I know whether I could ignore or I should do checks.