ASSESSE (BE)
Quarry blast9 December 2022
- Magnitude
- 1.2ML
- Depth
- –
- Belgian time
- 11:38:282022-12-09
- UTC
- 10:38:282022-12-09
Main parameters
| Date and time | 2022-12-09 10:38:28 UTC 2022-12-09 11:38:28 Belgian time |
|---|---|
| Magnitude | ML 1.2 |
| Epicentral coordinates | 50.346° N, 4.981° E Uncertainty ± 0.9 km |
| Event ID | ROB 18005 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2022-12-14 16:19:23 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
- 8.7 – 39.3km
- Mean velocity, P wave
- 6.0km/s
- Mean velocity, S wave
- 3.3km/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 0.16 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 | 8.7 | 60 | 10:38:30.22+1.67 s | 10:38:31.72+3.17 s | 1.50 |
| MRDMaredsous | 16.0 | 252 | 10:38:31.65+3.10 s | 10:38:33.69+5.14 s | 2.04 |
| CLAClavier | 24.2 | 70 | 10:38:32.64+4.09 s | 10:38:36.39+7.84 s | 3.75 |
| RCHRochefort | 27.6 | 140 | 10:38:33.43+4.88 s | 10:38:37.08+8.53 s | 3.65 |
| DOUDourbes | 39.3 | 225 | 10:38:35.59+7.04 s | 10:38:40.83+12.28 s | 5.24 |