REBECQ (BE)
Quarry blast7 May 2021
- Magnitude
- 1.1ML
- Depth
- –
- Belgian time
- 11:59:192021-05-07
- UTC
- 09:59:192021-05-07
Main parameters
| Date and time | 2021-05-07 09:59:19 UTC 2021-05-07 11:59:19 Belgian time |
|---|---|
| Magnitude | ML 1.1 |
| Epicentral coordinates | 50.663° N, 4.148° E Uncertainty ± 4.8 km |
| Event ID | ROB 13350 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-05-07 16:36:14 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
- 5
- Epicentral distance
- 5.0 – 73.4km
- Mean velocity, P wave
- 7.0km/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. Depth not determined: hypocenter placed at the surface for the calculation. P wave: 5 measurements, root-mean-square deviation 0.47 s. S wave: 4 measurements, root-mean-square deviation 0.59 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)5 stations | |||||
| SKQSteenkerque | 5.0 | 252 | 09:59:20.66+0.70 s | 09:59:22.16+2.20 s | 1.50 |
| RQRRonquières | 8.4 | 139 | 09:59:21.89+1.93 s | 09:59:23.79+3.83 s | 1.90 |
| SNFSeneffe | 19.5 | 150 | 09:59:22.81+2.85 s | 09:59:25.71+5.75 s | 2.90 |
| TGATangissart | 27.2 | 104 | 09:59:25.09+5.13 s | 09:59:29.43+9.47 s | 4.34 |
| GESGesves | 73.4 | 115 | 09:59:30.86+10.90 s | – | – |