CELLES (BE)
Quarry blast7 February 2023
- Magnitude
- 2.0ML
- Depth
- –
- Belgian time
- 12:59:552023-02-07
- UTC
- 11:59:552023-02-07
Main parameters
| Date and time | 2023-02-07 11:59:55 UTC 2023-02-07 12:59:55 Belgian time |
|---|---|
| Magnitude | ML 2.0 |
| Epicentral coordinates | 50.662° N, 3.475° E Uncertainty ± 4.6 km |
| Event ID | ROB 18580 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2023-02-08 17:58:17 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
- 42.8 – 197.5km
- 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: 7 measurements, root-mean-square deviation 0.18 s. S wave: 4 measurements, root-mean-square deviation 0.20 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 | 42.8 | 92 | 12:00:03.42+7.77 s | 12:00:08.95+13.30 s | 5.53 |
| BRQBracquegnies | 51.0 | 113 | 12:00:04.69+9.04 s | – | – |
| RQRRonquières | 53.4 | 96 | 12:00:04.92+9.27 s | – | – |
| SNFSeneffe | 59.7 | 106 | 12:00:05.71+10.06 s | 12:00:13.29+17.64 s | 7.58 |
| TGATangissart | 74.3 | 94 | 12:00:08.23+12.58 s | – | – |
| DOUDourbes | 101.6 | 128 | 12:00:13.04+17.39 s | 12:00:25.71+30.06 s | 12.67 |
| GESGesves | 118.4 | 104 | 12:00:15.81+20.16 s | 12:00:30.64+34.99 s | 14.83 |
| CLAClavier | 132.3 | 101 | 12:00:18.35+22.70 s | – | – |
| KLBKalborn | 197.5 | 107 | 12:00:26.73+31.08 s | – | – |