ROCHEFORT (BE)
Quarry blast17 November 2021
- Magnitude
- 1.1ML
- Depth
- –
- Belgian time
- 13:22:372021-11-17
- UTC
- 12:22:372021-11-17
Main parameters
| Date and time | 2021-11-17 12:22:37 UTC 2021-11-17 13:22:37 Belgian time |
|---|---|
| Magnitude | ML 1.1 |
| Epicentral coordinates | 50.183° N, 5.247° E Uncertainty ± 0.6 km |
| Event ID | ROB 14785 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-11-18 10:49:19 Belgian time
Location map
- Epicentre
- Station that recorded the event
Arrival times at the stations
Each station first records the P wave, the fastest, then the S wave. The farther a station is from the epicentre, the later the waves reach it and the wider the gap between the two.
- Stations
- 5
- Epicentral distance
- 25.2 – 62.3km
- Mean velocity, P wave
- 6.2km/s
- Mean velocity, S wave
- 3.4km/s
- P wave
- S wave
- Curve fitted to the measurements
Notes and method
Curves: travel time of a direct wave in a homogeneous medium. The velocity of each wave and an origin-time shift, common to both, are fitted to the measurements by least squares. Depth not determined: hypocenter placed at the surface for the calculation. P wave: 5 measurements, root-mean-square deviation 0.10 s. S wave: 5 measurements, root-mean-square deviation 0.14 s.
Station measurements
P- and S-wave arrivals and ground displacement measured at each station. Click a column heading to change the order.
| km | ° | UTC | UTC | s | |
|---|---|---|---|---|---|
| Belgian seismic network (Royal Observatory of Belgium)5 stations | |||||
| GESGesves | 25.2 | 333 | 12:22:41.97+4.79 s | 12:22:45.30+8.12 s | 3.33 |
| CLAClavier | 26.5 | 9 | 12:22:42.19+5.01 s | 12:22:45.39+8.21 s | 3.20 |
| MRDMaredsous | 36.6 | 291 | 12:22:43.75+6.57 s | 12:22:48.50+11.32 s | 4.75 |
| DOUDourbes | 47.6 | 258 | 12:22:45.69+8.51 s | 12:22:51.53+14.35 s | 5.84 |
| KLBKalborn | 62.3 | 98 | 12:22:47.75+10.57 s | 12:22:56.11+18.93 s | 8.36 |