CELLES (BE)
Quarry blast2 February 2022
- Magnitude
- 1.6ML
- Depth
- –
- Belgian time
- 13:00:062022-02-02
- UTC
- 12:00:062022-02-02
Main parameters
| Date and time | 2022-02-02 12:00:06 UTC 2022-02-02 13:00:06 Belgian time |
|---|---|
| Magnitude | ML 1.6 |
| Epicentral coordinates | 50.753° N, 3.448° E Uncertainty ± 8.3 km |
| Event ID | ROB 15350 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2022-02-07 09:24:43 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
- 8
- Epicentral distance
- 28.3 – 136.4km
- Mean velocity, P wave
- 5.8km/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: 6 measurements, root-mean-square deviation 0.41 s. S wave: 5 measurements, root-mean-square deviation 0.47 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)8 stations | |||||
| LESLessines | 28.3 | 99 | 12:00:11.32+4.85 s | 12:00:15.03+8.56 s | 3.71 |
| SKQSteenkerque | 46.1 | 104 | 12:00:14.65+8.18 s | 12:00:20.58+14.11 s | 5.93 |
| RQRRonquières | 57.3 | 106 | 12:00:16.73+10.26 s | 12:00:22.54+16.07 s | 5.81 |
| BRQBracquegnies | 57.3 | 122 | 12:00:15.85+9.38 s | – | – |
| TGATangissart | 77.7 | 102 | 12:00:19.60+13.13 s | 12:00:29.22+22.75 s | 9.62 |
| DOUDourbes | 109.5 | 131 | 12:00:25.99+19.52 s | 12:00:37.59+31.12 s | 11.60 |
| GESGesves | 123.1 | 109 | 12:00:26.94+20.47 s | 12:00:42.17+35.70 s | 15.23 |
| CLAClavier | 136.4 | 105 | 12:00:30.22+23.75 s | – | – |