Table 1.
N (number of wireless emergency alerts [WEAs]) and DCN (daily cumulative number of WEAs) at hour level for WEAs issued in 25 districts of Seoul between January 2020 and January 2021.
| Hour | N | DCN |
| 0 | 0.000 | 0.000 |
| 1 | 0.000 | 0.000 |
| 2 | 0.000 | 0.000 |
| 3 | 0.000 | 0.000 |
| 4 | 0.000 | 0.000 |
| 5 | 0.000 | 0.000 |
| 6 | 0.001 | 0.000 |
| 7 | 0.002 | 0.001 |
| 8 | 0.004 | 0.004 |
| 9 | 0.030 | 0.008 |
| 10 | 0.058 | 0.038 |
| 11 | 0.052 | 0.097 |
| 12 | 0.018 | 0.149 |
| 13 | 0.036 | 0.166 |
| 14 | 0.042 | 0.203 |
| 15 | 0.047 | 0.244 |
| 16 | 0.056 | 0.291 |
| 17 | 0.088 | 0.347 |
| 18 | 0.122 | 0.435 |
| 19 | 0.047 | 0.557 |
| 20 | 0.025 | 0.604 |
| 21 | 0.016 | 0.629 |
| 22 | 0.003 | 0.645 |
| 23 | 0.000 | 0.649 |