CELLES (BE)
Quarry blast29 April 2021
- Magnitude
- 2.0ML
- Depth
- –
- Belgian time
- 13:01:162021-04-29
- UTC
- 11:01:162021-04-29
Main parameters
| Date and time | 2021-04-29 11:01:16 UTC 2021-04-29 13:01:16 Belgian time |
|---|---|
| Magnitude | ML 2.0 |
| Epicentral coordinates | 50.686° N, 3.397° E Uncertainty ± 3.5 km |
| Event ID | ROB 13270 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-04-30 15:35:05 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
- 14
- Epicentral distance
- 31.6 – 203.5km
- Mean velocity, P wave
- 6.2km/s
- Mean velocity, S wave
- 3.3km/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: 9 measurements, root-mean-square deviation 0.36 s. S wave: 4 measurements, root-mean-square deviation 0.36 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)13 stations | |||||
| LESLessines | 31.6 | 85 | 11:01:23.32+6.47 s | 11:01:27.24+10.39 s | 3.92 |
| SKQSteenkerque | 48.4 | 95 | 11:01:25.33+8.48 s | 11:01:32.17+15.32 s | 6.84 |
| BOUBougnies | 51.0 | 130 | 11:01:25.49+8.64 s | – | – |
| BRQBracquegnies | 57.1 | 113 | 11:01:26.62+9.77 s | – | – |
| RQRRonquières | 59.2 | 98 | 11:01:26.79+9.94 s | – | – |
| SNFSeneffe | 65.7 | 107 | 11:01:27.78+10.93 s | – | – |
| UCCBUccle | 69.0 | 79 | 11:01:29.21+12.36 s | 11:01:37.86+21.01 s | 8.65 |
| TGATangissart | 80.0 | 96 | 11:01:30.20+13.35 s | – | – |
| DOUDourbes | 107.6 | 127 | 11:01:35.15+18.30 s | 11:01:50.53+33.68 s | 15.38 |
| GESGesves | 124.4 | 105 | 11:01:37.86+21.01 s | 11:01:55.05+38.20 s | 17.19 |
| CLAClavier | 138.2 | 102 | 11:01:40.28+23.43 s | – | – |
| RCHRochefort | 142.8 | 114 | 11:01:41.36+24.51 s | 11:01:59.89+43.04 s | 18.53 |
| KLBKalborn | 203.5 | 108 | 11:01:49.89+33.04 s | 11:02:15.59+58.74 s | 25.70 |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 179.1 | 86 | 11:01:46.64+29.79 s | – | – |