NAMUR (BE)
Quarry blast2 December 2021
- Magnitude
- 1.2ML
- Depth
- –
- Belgian time
- 14:15:252021-12-02
- UTC
- 13:15:252021-12-02
Main parameters
| Date and time | 2021-12-02 13:15:25 UTC 2021-12-02 14:15:25 Belgian time |
|---|---|
| Magnitude | ML 1.2 |
| Epicentral coordinates | 50.494° N, 4.960° E Uncertainty ± 2.9 km |
| Event ID | ROB 14930 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-12-06 13:52:23 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
- 8
- Epicentral distance
- 15.2 – 53.5km
- Mean velocity, P wave
- 5.7km/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: 8 measurements, root-mean-square deviation 0.27 s. S wave: 5 measurements, root-mean-square deviation 0.09 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)8 stations | |||||
| GESGesves | 15.2 | 143 | 13:15:28.44+2.62 s | 13:15:30.52+4.70 s | 2.08 |
| MRDMaredsous | 25.4 | 213 | 13:15:30.87+5.05 s | 13:15:33.57+7.75 s | 2.70 |
| CLAClavier | 25.7 | 109 | 13:15:30.42+4.60 s | 13:15:33.66+7.84 s | 3.24 |
| TGATangissart | 33.4 | 292 | 13:15:31.88+6.06 s | 13:15:35.68+9.86 s | 3.80 |
| RCHRochefort | 42.3 | 153 | 13:15:33.43+7.61 s | – | – |
| LCHLa Chartreuse | 48.1 | 70 | 13:15:34.55+8.73 s | 13:15:40.21+14.39 s | 5.66 |
| DOUDourbes | 51.5 | 210 | 13:15:35.38+9.56 s | – | – |
| RQRRonquières | 53.5 | 284 | 13:15:34.91+9.09 s | – | – |