REBECQ (BE)
Quarry blast22 June 2021
- Magnitude
- 1.8ML
- Depth
- –
- Belgian time
- 12:41:462021-06-22
- UTC
- 10:41:462021-06-22
Main parameters
| Date and time | 2021-06-22 10:41:46 UTC 2021-06-22 12:41:46 Belgian time |
|---|---|
| Magnitude | ML 1.8 |
| Epicentral coordinates | 50.667° N, 4.159° E Uncertainty ± 0.7 km |
| Event ID | ROB 13755 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-06-28 10:45:18 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
- 10
- Epicentral distance
- 5.9 – 152.4km
- Mean velocity, P wave
- 5.9km/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 0.13 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 | 5.9 | 250 | 10:41:48.08+1.19 s | 10:41:48.92+2.03 s | 0.84 |
| RQRRonquières | 8.2 | 145 | 10:41:48.31+1.42 s | – | – |
| SNFSeneffe | 19.5 | 153 | 10:41:50.44+3.55 s | – | – |
| UCCBUccle | 20.3 | 44 | 10:41:50.69+3.80 s | 10:41:53.11+6.22 s | 2.42 |
| UCCSUccle | 20.3 | 44 | 10:41:50.80+3.91 s | – | – |
| BRQBracquegnies | 20.8 | 184 | 10:41:50.78+3.89 s | – | – |
| GESGesves | 72.9 | 115 | 10:41:59.44+12.55 s | – | – |
| CLAClavier | 85.6 | 108 | 10:42:01.66+14.77 s | – | – |
| KLBKalborn | 152.4 | 114 | 10:42:12.93+26.04 s | – | – |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 125.7 | 84 | 10:42:08.58+21.69 s | – | – |