REBECQ (BE)
Quarry blast21 October 2021
- Magnitude
- 1.6ML
- Depth
- –
- Belgian time
- 13:25:432021-10-21
- UTC
- 11:25:432021-10-21
Main parameters
| Date and time | 2021-10-21 11:25:43 UTC 2021-10-21 13:25:43 Belgian time |
|---|---|
| Magnitude | ML 1.6 |
| Epicentral coordinates | 50.695° N, 4.176° E Uncertainty ± 3.0 km |
| Event ID | ROB 14635 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-10-22 16:24:20 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
- 4
- Epicentral distance
- 8.5 – 23.9km
- Mean velocity, P wave
- 6.3km/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 0.27 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)4 stations | |||||
| SKQSteenkerque | 8.5 | 233 | 11:25:44.80+1.63 s | 11:25:46.19+3.02 s | 1.39 |
| RQRRonquières | 10.5 | 161 | 11:25:45.80+2.63 s | – | – |
| SNFSeneffe | 21.8 | 159 | 11:25:47.01+3.84 s | 11:25:50.04+6.87 s | 3.03 |
| BRQBracquegnies | 23.9 | 187 | 11:25:47.70+4.53 s | – | – |
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