REBECQ (BE)
Quarry blast6 July 2021
- Magnitude
- 1.3ML
- Depth
- –
- Belgian time
- 11:39:592021-07-06
- UTC
- 09:39:592021-07-06
Main parameters
| Date and time | 2021-07-06 09:39:59 UTC 2021-07-06 11:39:59 Belgian time |
|---|---|
| Magnitude | ML 1.3 |
| Epicentral coordinates | 50.670° N, 4.157° E Uncertainty ± 1.2 km |
| Event ID | ROB 13885 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-07-06 17:07:02 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
- 9
- Epicentral distance
- 6.0 – 136.9km
- Mean velocity, P wave
- 5.5km/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 0.20 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)9 stations | |||||
| SKQSteenkerque | 6.0 | 246 | 09:40:00.32+1.12 s | 09:40:01.13+1.93 s | 0.81 |
| RQRRonquières | 8.6 | 146 | 09:40:00.60+1.40 s | – | – |
| SNFSeneffe | 19.9 | 153 | 09:40:02.84+3.64 s | – | – |
| UCCBUccle | 20.1 | 45 | 09:40:02.99+3.79 s | 09:40:05.49+6.29 s | 2.50 |
| BRQBracquegnies | 21.1 | 184 | 09:40:03.30+4.10 s | – | – |
| LESLessines | 22.7 | 282 | 09:40:03.45+4.25 s | – | – |
| TGATangissart | 26.8 | 106 | 09:40:03.68+4.48 s | 09:40:06.75+7.55 s | 3.07 |
| MEMHMembach | 131.2 | 92 | 09:40:22.19+22.99 s | 09:40:39.71+40.51 s | 17.52 |
| MRGMont Rigi | 136.9 | 97 | 09:40:23.18+23.98 s | 09:40:39.93+40.73 s | 16.75 |