REBECQ (BE)
Quarry blast3 August 2021
- Magnitude
- 1.1ML
- Depth
- –
- Belgian time
- 13:17:152021-08-03
- UTC
- 11:17:152021-08-03
Main parameters
| Date and time | 2021-08-03 11:17:15 UTC 2021-08-03 13:17:15 Belgian time |
|---|---|
| Magnitude | ML 1.1 |
| Epicentral coordinates | 50.671° N, 4.155° E Uncertainty ± 1.1 km |
| Event ID | ROB 14170 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-08-06 18:25:20 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
- 5.9 – 86.0km
- Mean velocity, P wave
- 5.9km/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: 8 measurements, root-mean-square deviation 0.27 s. S wave: 4 measurements, root-mean-square deviation 0.25 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 | |||||
| SKQSteenkerque | 5.9 | 245 | 11:17:16.53+1.31 s | 11:17:17.06+1.84 s | 0.53 |
| RQRRonquières | 8.8 | 146 | 11:17:16.84+1.62 s | – | – |
| SNFSeneffe | 20.0 | 153 | 11:17:18.95+3.73 s | – | – |
| UCCBUccle | 20.1 | 46 | 11:17:19.18+3.96 s | 11:17:21.61+6.39 s | 2.43 |
| TGATangissart | 27.0 | 106 | 11:17:19.91+4.69 s | 11:17:23.71+8.49 s | 3.80 |
| DOUDourbes | 71.3 | 154 | 11:17:28.28+13.06 s | – | – |
| GESGesves | 73.3 | 115 | 11:17:28.00+12.78 s | 11:17:36.58+21.36 s | 8.58 |
| CLAClavier | 86.0 | 109 | 11:17:29.91+14.69 s | – | – |