CELLES (BE)
Quarry blast16 February 2021
- Magnitude
- 2.1ML
- Depth
- –
- Belgian time
- 13:00:122021-02-16
- UTC
- 12:00:122021-02-16
Main parameters
| Date and time | 2021-02-16 12:00:12 UTC 2021-02-16 13:00:12 Belgian time |
|---|---|
| Magnitude | ML 2.1 |
| Epicentral coordinates | 50.668° N, 3.476° E Uncertainty ± 2.9 km |
| Event ID | ROB 12350 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-02-16 13:52:10 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
- 15
- Epicentral distance
- 26.4 – 197.6km
- Mean velocity, P wave
- 6.2km/s
- Mean velocity, S wave
- 3.4km/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 0.24 s. S wave: 5 measurements, root-mean-square deviation 0.60 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)14 stations | |||||
| LESLessines | 26.4 | 79 | 12:00:17.48+4.63 s | 12:00:21.96+9.11 s | 4.48 |
| SKQSteenkerque | 42.8 | 93 | 12:00:20.13+7.28 s | 12:00:25.48+12.63 s | 5.35 |
| BOUBougnies | 45.5 | 133 | 12:00:21.08+8.23 s | – | – |
| BRQBracquegnies | 51.2 | 114 | 12:00:21.28+8.43 s | – | – |
| RQRRonquières | 53.4 | 97 | 12:00:21.81+8.96 s | – | – |
| UCCBUccle | 64.0 | 77 | 12:00:23.85+11.00 s | 12:00:31.77+18.92 s | 7.92 |
| TGATangissart | 74.3 | 95 | 12:00:25.10+12.25 s | – | – |
| DOUDourbes | 102.0 | 128 | 12:00:29.80+16.95 s | 12:00:42.33+29.48 s | 12.53 |
| GESGesves | 118.5 | 105 | 12:00:32.80+19.95 s | 12:00:48.39+35.54 s | 15.59 |
| CLAClavier | 132.4 | 101 | 12:00:35.22+22.37 s | 12:00:52.38+39.53 s | 17.16 |
| RCHRochefort | 136.9 | 114 | 12:00:36.56+23.71 s | 12:00:53.09+40.24 s | 16.53 |
| MEMHMembach | 179.4 | 91 | 12:00:42.79+29.94 s | 12:01:02.41+49.56 s | 19.62 |
| HOUHouvegnez | 182.8 | 100 | 12:00:42.75+29.90 s | – | – |
| KLBKalborn | 197.6 | 108 | 12:00:44.49+31.64 s | – | – |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 173.8 | 86 | 12:00:41.51+28.66 s | – | – |