NAMUR (BE)
Quarry blast17 February 2023
- Magnitude
- 1.2ML
- Depth
- –
- Belgian time
- 14:34:182023-02-17
- UTC
- 13:34:182023-02-17
Main parameters
| Date and time | 2023-02-17 13:34:18 UTC 2023-02-17 14:34:18 Belgian time |
|---|---|
| Magnitude | ML 1.2 |
| Epicentral coordinates | 50.492° N, 4.927° E Uncertainty ± 0.8 km |
| Event ID | ROB 18740 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2023-02-22 00:30:51 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
- 5
- Epicentral distance
- 16.5 – 50.1km
- Mean velocity, P wave
- 6.1km/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: 5 measurements, root-mean-square deviation 0.14 s. S wave: 5 measurements, root-mean-square deviation 0.18 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)5 stations | |||||
| GESGesves | 16.5 | 136 | 13:34:21.10+2.93 s | 13:34:23.43+5.26 s | 2.33 |
| MRDMaredsous | 24.0 | 208 | 13:34:22.63+4.46 s | 13:34:26.03+7.86 s | 3.40 |
| CLAClavier | 27.9 | 107 | 13:34:23.36+5.19 s | 13:34:27.27+9.10 s | 3.91 |
| TGATangissart | 31.3 | 294 | 13:34:23.62+5.45 s | 13:34:27.96+9.79 s | 4.34 |
| DOUDourbes | 50.1 | 208 | 13:34:26.91+8.74 s | 13:34:33.57+15.40 s | 6.66 |