ANDERLUES (BE)
Quarry blast5 April 2023
- Magnitude
- 1.4ML
- Depth
- –
- Belgian time
- 11:58:492023-04-05
- UTC
- 09:58:492023-04-05
Main parameters
| Date and time | 2023-04-05 09:58:49 UTC 2023-04-05 11:58:49 Belgian time |
|---|---|
| Magnitude | ML 1.4 |
| Epicentral coordinates | 50.389° N, 4.260° E Uncertainty ± 2.2 km |
| Event ID | ROB 19265 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2023-04-06 22:26:16 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
- 13.7 – 148.3km
- Mean velocity, P wave
- 6.7km/s
- Mean velocity, S wave
- 3.7km/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 0.61 s. S wave: 5 measurements, root-mean-square deviation 0.54 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)7 stations | |||||
| SNFSeneffe | 13.7 | 7 | 09:58:52.69+2.95 s | 09:58:54.84+5.10 s | 2.15 |
| BLRGBlaregnies | 26.0 | 262 | 09:58:54.03+4.29 s | – | – |
| SKQSteenkerque | 31.6 | 336 | 09:58:56.46+6.72 s | 09:58:59.41+9.67 s | 2.95 |
| MRDMaredsous | 37.4 | 105 | 09:58:55.83+6.09 s | 09:59:00.26+10.52 s | 4.43 |
| DOUDourbes | 40.5 | 144 | 09:58:57.63+7.89 s | 09:59:02.68+12.94 s | 5.05 |
| GESGesves | 58.8 | 90 | 09:58:59.62+9.88 s | 09:59:06.38+16.64 s | 6.76 |
| KLBKalborn | 135.7 | 103 | 09:59:12.53+22.79 s | – | – |
| Bensberg seismic network (University of Cologne, Germany)1 station | |||||
| KLLKalltalsperre | 148.3 | 78 | 09:59:14.36+24.62 s | – | – |