CELLES (BE)
Quarry blast4 December 2020
- Magnitude
- 2.2ML
- Depth
- –
- Belgian time
- 12:59:592020-12-04
- UTC
- 11:59:592020-12-04
Main parameters
| Date and time | 2020-12-04 11:59:59 UTC 2020-12-04 12:59:59 Belgian time |
|---|---|
| Magnitude | ML 2.2 |
| Epicentral coordinates | 50.694° N, 3.410° E Uncertainty ± 4.0 km |
| Event ID | ROB 11475 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-12-04 13:18:25 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
- 13
- Epicentral distance
- 30.7 – 203.0km
- Mean velocity, P wave
- 6.1km/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: 8 measurements, root-mean-square deviation 0.54 s. S wave: 4 measurements, root-mean-square deviation 0.41 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 | 30.7 | 86 | 12:00:03.63+4.46 s | 12:00:09.12+9.95 s | 5.49 |
| SKQSteenkerque | 47.6 | 96 | 12:00:07.33+8.16 s | – | – |
| BOUBougnies | 50.9 | 132 | 12:00:08.49+9.32 s | – | – |
| BRQBracquegnies | 56.6 | 114 | 12:00:08.40+9.23 s | – | – |
| RQRRonquières | 58.5 | 99 | 12:00:09.97+10.80 s | 12:00:16.22+17.05 s | 6.25 |
| TGATangissart | 79.3 | 97 | 12:00:12.14+12.97 s | – | – |
| MRDMaredsous | 105.8 | 114 | 12:00:17.06+17.89 s | 12:00:30.61+31.44 s | 13.55 |
| DOUDourbes | 107.4 | 128 | 12:00:17.00+17.83 s | 12:00:30.54+31.37 s | 13.54 |
| GESGesves | 123.8 | 105 | 12:00:19.72+20.55 s | 12:00:37.32+38.15 s | 17.60 |
| CLAClavier | 137.5 | 102 | 12:00:22.14+22.97 s | 12:00:40.75+41.58 s | 18.61 |
| RCHRochefort | 142.4 | 114 | 12:00:23.74+24.57 s | 12:00:40.80+41.63 s | 17.06 |
| MEMSMembach | 184.1 | 92 | 12:00:29.41+30.24 s | 12:00:51.71+52.54 s | 22.30 |
| KLBKalborn | 203.0 | 108 | 12:00:31.82+32.65 s | 12:00:55.52+56.35 s | 23.70 |