CELLES (BE)
Quarry blast26 November 2021
- Magnitude
- 1.5ML
- Depth
- –
- Belgian time
- 12:31:542021-11-26
- UTC
- 11:31:542021-11-26
Main parameters
| Date and time | 2021-11-26 11:31:54 UTC 2021-11-26 12:31:54 Belgian time |
|---|---|
| Magnitude | ML 1.5 |
| Epicentral coordinates | 50.687° N, 3.468° E Uncertainty ± 31.6 km |
| Event ID | ROB 14875 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-12-06 13:49:11 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
- 6
- Epicentral distance
- 43.5 – 119.6km
- Mean velocity, P wave
- 5.6km/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: 6 measurements, root-mean-square deviation 0.41 s. S wave: 5 measurements, root-mean-square deviation 0.44 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)6 stations | |||||
| SKQSteenkerque | 43.5 | 95 | 11:32:01.04+6.94 s | 11:32:06.89+12.79 s | 5.85 |
| RQRRonquières | 54.3 | 99 | 11:32:03.49+9.39 s | 11:32:09.66+15.56 s | 6.17 |
| SNFSeneffe | 61.0 | 108 | 11:32:05.03+10.93 s | – | – |
| MRDMaredsous | 101.7 | 114 | 11:32:11.68+17.58 s | 11:32:24.84+30.74 s | 13.16 |
| DOUDourbes | 103.7 | 129 | 11:32:11.49+17.39 s | 11:32:24.28+30.18 s | 12.79 |
| GESGesves | 119.6 | 106 | 11:32:15.35+21.25 s | 11:32:30.12+36.02 s | 14.77 |