CELLES (BE)
Quarry blast18 November 2021
- Magnitude
- 1.9ML
- Depth
- –
- Belgian time
- 13:01:472021-11-18
- UTC
- 12:01:472021-11-18
Main parameters
| Date and time | 2021-11-18 12:01:47 UTC 2021-11-18 13:01:47 Belgian time |
|---|---|
| Magnitude | ML 1.9 |
| Epicentral coordinates | 50.736° N, 3.404° E Uncertainty ± 6.3 km |
| Event ID | ROB 14810 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-11-19 16:01:06 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
- 48.7 – 204.9km
- Mean velocity, P wave
- 6.2km/s
- Mean velocity, S wave
- 3.5km/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: 5 measurements, root-mean-square deviation 0.18 s. S wave: 4 measurements, root-mean-square deviation 0.23 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)9 stations | |||||
| SKQSteenkerque | 48.7 | 101 | 12:01:56.98+9.02 s | 12:02:02.76+14.80 s | 5.78 |
| BRQBracquegnies | 59.1 | 118 | 12:01:58.23+10.27 s | – | – |
| SNFSeneffe | 67.1 | 112 | 12:01:59.47+11.51 s | 12:02:08.15+20.19 s | 8.68 |
| TGATangissart | 80.4 | 100 | 12:02:01.77+13.81 s | 12:02:11.66+23.70 s | 9.89 |
| DOUDourbes | 110.7 | 130 | 12:02:06.57+18.61 s | 12:02:21.08+33.12 s | 14.51 |
| GESGesves | 125.5 | 107 | 12:02:09.62+21.66 s | 12:02:26.30+38.34 s | 16.68 |
| CLAClavier | 139.0 | 104 | 12:02:11.52+23.56 s | 12:02:29.59+41.63 s | 18.07 |
| RCHRochefort | 144.7 | 116 | 12:02:06.45+18.49 s | 12:02:29.00+41.04 s | 22.55 |
| KLBKalborn | 204.9 | 109 | 12:02:20.61+32.65 s | 12:02:44.58+56.62 s | 23.97 |