REBECQ (BE)
Quarry blast20 April 2021
- Magnitude
- 1.6ML
- Depth
- –
- Belgian time
- 11:41:282021-04-20
- UTC
- 09:41:282021-04-20
Main parameters
| Date and time | 2021-04-20 09:41:28 UTC 2021-04-20 11:41:28 Belgian time |
|---|---|
| Magnitude | ML 1.6 |
| Epicentral coordinates | 50.661° N, 4.168° E Uncertainty ± 1.1 km |
| Event ID | ROB 13190 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-04-20 15:24:55 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
- 6.4 – 84.8km
- Mean velocity, P wave
- 4.9km/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: 9 measurements, root-mean-square deviation 0.66 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)9 stations | |||||
| SKQSteenkerque | 6.4 | 258 | 09:41:29.99+1.28 s | 09:41:30.84+2.13 s | 0.85 |
| RQRRonquières | 7.3 | 146 | 09:41:30.29+1.58 s | – | – |
| SNFSeneffe | 18.6 | 154 | 09:41:32.42+3.71 s | – | – |
| BRQBracquegnies | 20.1 | 186 | 09:41:32.24+3.53 s | – | – |
| UCCBUccle | 20.3 | 42 | 09:41:32.68+3.97 s | 09:41:35.13+6.42 s | 2.45 |
| TGATangissart | 25.8 | 104 | 09:41:33.33+4.62 s | 09:41:36.13+7.42 s | 2.80 |
| BOUBougnies | 34.1 | 208 | 09:41:35.58+6.87 s | – | – |
| GESGesves | 72.0 | 115 | 09:41:41.83+13.12 s | – | – |
| CLAClavier | 84.8 | 108 | 09:41:47.07+18.36 s | – | – |
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