WAIMES (BE)
Quarry blast31 August 2021
- Magnitude
- 1.5ML
- Depth
- –
- Belgian time
- 15:09:182021-08-31
- UTC
- 13:09:182021-08-31
Main parameters
| Date and time | 2021-08-31 13:09:18 UTC 2021-08-31 15:09:18 Belgian time |
|---|---|
| Magnitude | ML 1.5 |
| Epicentral coordinates | 50.416° N, 6.099° E Uncertainty ± 1.0 km |
| Event ID | ROB 14375 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-08-31 15:29:45 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
- 20
- Epicentral distance
- 9.6 – 163.2km
- Mean velocity, P wave
- 6.0km/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: 15 measurements, root-mean-square deviation 0.32 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)17 stations | |||||
| HOUHouvegnez | 9.6 | 224 | 13:09:20.53+1.80 s | – | – |
| MRGMont Rigi | 10.7 | 351 | 13:09:20.47+1.74 s | 13:09:22.01+3.28 s | 1.54 |
| KLBKalborn | 35.1 | 179 | 13:09:25.20+6.47 s | 13:09:29.75+11.02 s | 4.55 |
| LCHLa Chartreuse | 43.3 | 305 | 13:09:26.70+7.97 s | – | – |
| EBNEben-Emael | 51.8 | 325 | 13:09:27.88+9.15 s | – | – |
| VIAVianden | 54.0 | 172 | 13:09:27.82+9.09 s | – | – |
| CLAClavier | 56.7 | 271 | 13:09:28.62+9.89 s | – | – |
| RCHRochefort | 68.6 | 245 | 13:09:30.58+11.85 s | – | – |
| GESGesves | 72.1 | 268 | 13:09:30.55+11.82 s | – | – |
| WLFWalferdange | 83.7 | 177 | 13:09:33.50+14.77 s | – | – |
| MRDMaredsous | 95.6 | 263 | 13:09:34.99+16.26 s | – | – |
| DOUDourbes | 113.1 | 252 | 13:09:37.31+18.58 s | – | – |
| SNFSeneffe | 129.3 | 275 | 13:09:40.64+21.91 s | – | – |
| UCCBUccle | 130.2 | 290 | 13:09:41.03+22.30 s | – | – |
| SKQSteenkerque | 145.5 | 281 | 13:09:43.51+24.78 s | – | – |
| BOUBougnies | 153.2 | 270 | 13:09:44.64+25.91 s | – | – |
| LESLessines | 163.2 | 282 | 13:09:45.97+27.24 s | – | – |
| Dutch seismic network (KNMI)2 stations | |||||
| HGNHeimansgroeve | 40.5 | 343 | 13:09:25.85+7.12 s | 13:09:31.20+12.47 s | 5.35 |
| VKBValkenburg | 54.9 | 336 | 13:09:28.45+9.72 s | – | – |
| Bensberg seismic network (University of Cologne, Germany)1 station | |||||
| KLLKalltalsperre | 29.8 | 30 | 13:09:23.78+5.05 s | – | – |