REBECQ (BE)
Quarry blast15 April 2021
- Magnitude
- 1.2ML
- Depth
- –
- Belgian time
- 15:11:532021-04-15
- UTC
- 13:11:532021-04-15
Main parameters
| Date and time | 2021-04-15 13:11:53 UTC 2021-04-15 15:11:53 Belgian time |
|---|---|
| Magnitude | ML 1.2 |
| Epicentral coordinates | 50.668° N, 4.159° E Uncertainty ± 0.8 km |
| Event ID | ROB 13155 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-04-15 22:35:30 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
- 6.0 – 85.6km
- Mean velocity, P wave
- 5.7km/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: 7 measurements, root-mean-square deviation 0.16 s. S wave: 4 measurements, root-mean-square deviation 0.24 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 | 6.0 | 249 | 13:11:54.50+1.25 s | 13:11:55.25+2.00 s | 0.75 |
| RQRRonquières | 8.3 | 146 | 13:11:54.91+1.66 s | – | – |
| SNFSeneffe | 19.6 | 153 | 13:11:56.98+3.73 s | – | – |
| UCCBUccle | 20.2 | 45 | 13:11:57.17+3.92 s | 13:11:59.62+6.37 s | 2.45 |
| TGATangissart | 26.6 | 105 | 13:11:57.95+4.70 s | 13:12:00.81+7.56 s | 2.86 |
| GESGesves | 72.9 | 115 | 13:12:06.47+13.22 s | – | – |
| CLAClavier | 85.6 | 108 | 13:12:08.22+14.97 s | 13:12:18.35+25.10 s | 10.13 |