NAMUR (BE)
Quarry blast26 April 2022
- Magnitude
- 1.5ML
- Depth
- –
- Belgian time
- 14:15:252022-04-26
- UTC
- 12:15:252022-04-26
Main parameters
| Date and time | 2022-04-26 12:15:25 UTC 2022-04-26 14:15:25 Belgian time |
|---|---|
| Magnitude | ML 1.5 |
| Epicentral coordinates | 50.493° N, 4.972° E Uncertainty ± 0.9 km |
| Event ID | ROB 16005 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2022-04-26 15:59:05 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
- 11
- Epicentral distance
- 14.5 – 92.1km
- 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: 11 measurements, root-mean-square deviation 0.40 s. S wave: 8 measurements, root-mean-square deviation 0.40 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)9 stations | |||||
| GESGesves | 14.5 | 146 | 12:15:27.28+2.16 s | 12:15:29.46+4.34 s | 2.18 |
| CLAClavier | 24.9 | 109 | 12:15:29.39+4.27 s | 12:15:32.91+7.79 s | 3.52 |
| MRDMaredsous | 25.7 | 214 | 12:15:29.87+4.75 s | 12:15:33.73+8.61 s | 3.86 |
| TGATangissart | 34.2 | 292 | 12:15:31.02+5.90 s | – | – |
| RCHRochefort | 41.8 | 154 | 12:15:32.56+7.44 s | 12:15:37.88+12.76 s | 5.32 |
| SNFSeneffe | 48.8 | 273 | 12:15:33.57+8.45 s | – | – |
| DOUDourbes | 51.8 | 211 | 12:15:34.60+9.48 s | 12:15:40.66+15.54 s | 6.06 |
| MEMHMembach | 74.7 | 80 | 12:15:38.48+13.36 s | 12:15:48.32+23.20 s | 9.84 |
| KLBKalborn | 92.1 | 118 | 12:15:41.31+16.19 s | – | – |
| Dutch seismic network (KNMI)2 stations | |||||
| VKBValkenburg | 70.9 | 54 | 12:15:38.79+13.67 s | 12:15:46.48+21.36 s | 7.69 |
| HGNHeimansgroeve | 74.3 | 66 | 12:15:37.95+12.83 s | 12:15:47.12+22.00 s | 9.17 |