| Clue | Source | Date |
|---|---|---|
| Not noticed | ||
| Like a magnitude 1.0 quake | Wall Street Journal | 16 Oct 2019 |
| Like a magnitude 1.0 quake | ||
| Insincere | Eugene Sheffer | 10 Jun 2016 |
| Insincere | ||
| Like a mild earthquake, maybe | ||
| Not noticed | ||
| Like quakes of magnitude 2.0 or less | ||
| Not sensed | ||
| Not sensed | ||
| Not sensed. |