US Dollar / Hong Kong Dollar: a 3.3σ fall on 21 October 2026
Recorded 23 October 2026On 21 October 2026 US Dollar / Hong Kong Dollar fell 0.03% close to close, 3.3 times its typical daily move of 0.01% over the 20 sessions before it: its largest move since 19 August 2026. 10 other instruments of the 199 measured that day moved 2σ or more.
The day
Daily closes, as recorded the night after
- Move
- −0.03%
- Size
- −3.3σ
- Typical day before it
- 0.01%
- Close
- 7.8464
- Previous close, 20 October 2026
- 7.8484
- Since, to 23 October 2026
- −0.12%
US Dollar / Hong Kong Dollar, the 30 sessions to 21 October 2026
Daily closes; the last point is the quake
Show values
| Point | USD/HKD |
|---|---|
| 9 Sep 2026 | 7.8422 |
| 10 Sep 2026 | 7.8412 |
| 13 Sep 2026 | 7.8420 |
| 14 Sep 2026 | 7.8431 |
| 15 Sep 2026 | 7.8445 |
| 16 Sep 2026 | 7.8441 |
| 17 Sep 2026 | 7.8459 |
| 20 Sep 2026 | 7.8447 |
| 21 Sep 2026 | 7.8448 |
| 22 Sep 2026 | 7.8426 |
| 23 Sep 2026 | 7.8425 |
| 24 Sep 2026 | 7.8427 |
| 27 Sep 2026 | 7.8441 |
| 28 Sep 2026 | 7.8447 |
| 29 Sep 2026 | 7.8461 |
| 30 Sep 2026 | 7.8462 |
| 1 Oct 2026 | 7.8464 |
| 4 Oct 2026 | 7.8470 |
| 5 Oct 2026 | 7.8466 |
| 6 Oct 2026 | 7.8477 |
| 7 Oct 2026 | 7.8474 |
| 8 Oct 2026 | 7.8474 |
| 11 Oct 2026 | 7.8472 |
| 12 Oct 2026 | 7.8474 |
| 13 Oct 2026 | 7.8484 |
| 14 Oct 2026 | 7.8477 |
| 15 Oct 2026 | 7.8472 |
| 18 Oct 2026 | 7.8475 |
| 19 Oct 2026 | 7.8476 |
| 20 Oct 2026 | 7.8484 |
| 21 Oct 2026 | 7.8464 |
The same day
Other quakes on 21 October 2026
| Instrument | Move | Size |
|---|---|---|
| US Dollar / Taiwan Dollar USD/TWD | −0.65% | −3.2σ |
| Netflix NFLX | −5.31% | −3.1σ |
US Dollar / Hong Kong Dollar's other quakes
On record, newest first
- 19 August 2026: −0.05%, −3.5σ
- 17 August 2026: −0.03%, −3.0σ
How it is measured
The move is the close-to-close return; its size is that return divided by the standard deviation of US Dollar / Hong Kong Dollar's previous 20 daily returns. A quake is 3σ or more. This record was made the night after the day finished trading and has not been changed since. The live chart is on US Dollar / Hong Kong Dollar's page; the last few months of every market's daily moves are on the volatility terrain, and every quake on record is in the quake archive.