REBECQ (BE)
Quarry blast22 April 2021
- Magnitude
- 1.4ML
- Depth
- –
- Belgian time
- 11:12:342021-04-22
- UTC
- 09:12:342021-04-22
Main parameters
| Date and time | 2021-04-22 09:12:34 UTC 2021-04-22 11:12:34 Belgian time |
|---|---|
| Magnitude | ML 1.4 |
| Epicentral coordinates | 50.669° N, 4.172° E Uncertainty ± 3.6 km |
| Event ID | ROB 13220 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-04-23 18:00:02 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
- 7
- Epicentral distance
- 6.9 – 84.8km
- Mean velocity, P wave
- 4.9km/s
- Mean velocity, S wave
- 3.1km/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: 7 measurements, root-mean-square deviation 0.51 s. S wave: 5 measurements, root-mean-square deviation 0.32 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)7 stations | |||||
| SKQSteenkerque | 6.9 | 251 | 09:12:36.14+1.30 s | 09:12:36.95+2.11 s | 0.81 |
| RQRRonquières | 8.0 | 152 | 09:12:36.37+1.53 s | – | – |
| SNFSeneffe | 19.3 | 156 | 09:12:39.28+4.44 s | – | – |
| UCCBUccle | 19.5 | 43 | 09:12:38.68+3.84 s | 09:12:41.11+6.27 s | 2.43 |
| TGATangissart | 25.8 | 106 | 09:12:39.38+4.54 s | 09:12:42.37+7.53 s | 2.99 |
| DOUDourbes | 70.6 | 155 | 09:12:48.18+13.34 s | 09:12:57.37+22.53 s | 9.19 |
| CLAClavier | 84.8 | 109 | 09:12:52.48+17.64 s | 09:13:02.34+27.50 s | 9.86 |