NAMUR (BE)
Quarry blast14 September 2021
- Magnitude
- 1.5ML
- Depth
- 5.0km ± 12.4
- Belgian time
- 14:19:312021-09-14
- UTC
- 12:19:312021-09-14
Main parameters
| Date and time | 2021-09-14 12:19:31 UTC 2021-09-14 14:19:31 Belgian time |
|---|---|
| Magnitude | ML 1.5 |
| Epicentral coordinates | 50.496° N, 4.979° E Uncertainty ± 1.3 km |
| Depth of hypocenter | 5.0 ± 12.4 km |
| Event ID | ROB 14415 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-09-16 15:45:14 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
- 14.6 – 52.4km
- Mean velocity, P wave
- 5.4km/s
- Mean velocity, S wave
- 3.2km/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. Hypocenter at a depth of 5.0 km. P wave: 8 measurements, root-mean-square deviation 0.25 s. S wave: 7 measurements, root-mean-square deviation 0.49 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 | 14.6 | 148 | 12:19:33.89+2.07 s | 12:19:35.38+3.56 s | 1.49 |
| CLAClavier | 24.5 | 110 | 12:19:36.09+4.27 s | 12:19:38.81+6.99 s | 2.72 |
| MRDMaredsous | 26.3 | 215 | 12:19:36.58+4.76 s | 12:19:40.16+8.34 s | 3.58 |
| TGATangissart | 34.6 | 291 | 12:19:37.76+5.94 s | 12:19:42.58+10.76 s | 4.82 |
| RCHRochefort | 41.9 | 155 | 12:19:39.00+7.18 s | 12:19:44.76+12.94 s | 5.76 |
| LCHLa Chartreuse | 46.7 | 70 | 12:19:39.93+8.11 s | 12:19:45.17+13.35 s | 5.24 |
| SNFSeneffe | 49.4 | 272 | 12:19:39.95+8.13 s | 12:19:46.52+14.70 s | 6.57 |
| DOUDourbes | 52.4 | 212 | 12:19:41.19+9.37 s | – | – |
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