ASSESSE (BE)
Quarry blast4 February 2022
- Magnitude
- 1.1ML
- Depth
- –
- Belgian time
- 12:52:312022-02-04
- UTC
- 11:52:312022-02-04
Main parameters
| Date and time | 2022-02-04 11:52:31 UTC 2022-02-04 12:52:31 Belgian time |
|---|---|
| Magnitude | ML 1.1 |
| Epicentral coordinates | 50.363° N, 4.949° E Uncertainty ± 1.2 km |
| Event ID | ROB 15385 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2022-02-07 09:26:41 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
- 6
- Epicentral distance
- 10.2 – 54.7km
- Mean velocity, P wave
- 6.0km/s
- Mean velocity, S wave
- 3.5km/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: 6 measurements, root-mean-square deviation 0.30 s. S wave: 5 measurements, root-mean-square deviation 0.20 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)6 stations | |||||
| GESGesves | 10.2 | 76 | 11:52:33.95+2.24 s | 11:52:35.05+3.34 s | 1.10 |
| MRDMaredsous | 14.5 | 242 | 11:52:35.01+3.30 s | 11:52:36.50+4.79 s | 1.49 |
| CLAClavier | 25.9 | 76 | 11:52:36.80+5.09 s | 11:52:40.06+8.35 s | 3.26 |
| RCHRochefort | 30.5 | 139 | 11:52:37.31+5.60 s | 11:52:40.92+9.21 s | 3.61 |
| DOUDourbes | 39.1 | 220 | 11:52:39.41+7.70 s | 11:52:43.77+12.06 s | 4.36 |
| BDHNBois d'Haine | 54.7 | 288 | 11:52:41.08+9.37 s | – | – |