REBECQ (BE)
Quarry blast17 June 2021
- Magnitude
- 1.3ML
- Depth
- –
- Belgian time
- 11:24:432021-06-17
- UTC
- 09:24:432021-06-17
Main parameters
| Date and time | 2021-06-17 09:24:43 UTC 2021-06-17 11:24:43 Belgian time |
|---|---|
| Magnitude | ML 1.3 |
| Epicentral coordinates | 50.671° N, 4.158° E Uncertainty ± 4.2 km |
| Event ID | ROB 13680 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-06-18 11:15:18 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
- 6.0 – 152.6km
- Mean velocity, P wave
- 5.4km/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: 4 measurements, root-mean-square deviation 0.10 s.
Stations farther than 120 km are left out of the fit: the first waves to reach them have travelled beneath the crust, through the mantle, where they propagate faster.
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 | 6.0 | 246 | 09:24:44.60+1.19 s | 09:24:45.47+2.06 s | 0.87 |
| RQRRonquières | 8.6 | 147 | 09:24:44.82+1.41 s | – | – |
| SNFSeneffe | 19.9 | 153 | 09:24:47.00+3.59 s | – | – |
| UCCBUccle | 20.0 | 45 | 09:24:47.14+3.73 s | 09:24:49.58+6.17 s | 2.44 |
| KLBKalborn | 152.6 | 114 | 09:25:09.67+26.26 s | – | – |