WELLIN (BE)
Quarry blast21 September 2022
- Magnitude
- 1.2ML
- Depth
- –
- Belgian time
- 16:42:172022-09-21
- UTC
- 14:42:172022-09-21
Main parameters
| Date and time | 2022-09-21 14:42:17 UTC 2022-09-21 16:42:17 Belgian time |
|---|---|
| Magnitude | ML 1.2 |
| Epicentral coordinates | 50.094° N, 5.137° E Uncertainty ± 5.1 km |
| Event ID | ROB 17200 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2022-09-26 13:30:05 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
- 7
- Epicentral distance
- 9.3 – 131km
- Mean velocity, P wave
- 5.4km/s
- Mean velocity, S wave
- 3.2km/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 0.11 s. S wave: 4 measurements, root-mean-square deviation 0.21 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)6 stations | |||||
| RCHRochefort | 9.3 | 44 | 14:42:18.28+1.20 s | 14:42:19.62+2.54 s | 1.34 |
| GESGesves | 32.5 | 354 | 14:42:22.71+5.63 s | 14:42:27.19+10.11 s | 4.48 |
| MRDMaredsous | 35.0 | 311 | 14:42:23.27+6.19 s | 14:42:27.79+10.71 s | 4.52 |
| DOUDourbes | 38.8 | 270 | 14:42:23.80+6.72 s | 14:42:28.58+11.50 s | 4.78 |
| MRGMont Rigi | 81.3 | 55 | 14:42:31.59+14.51 s | – | – |
| SKQSteenkerque | 97.3 | 310 | 14:42:34.83+17.75 s | – | – |
| VITO (Mol)1 station | |||||
| RETGVRetie | 131* | – | 14:42:42.40+25.32 s | – | – |
* Distance from the catalogue, rounded to the kilometre: the coordinates of the station are missing from it.