WAIMES (BE)
Quarry blast5 August 2021
- Magnitude
- 1.2ML
- Depth
- –
- Belgian time
- 15:56:102021-08-05
- UTC
- 13:56:102021-08-05
Main parameters
| Date and time | 2021-08-05 13:56:10 UTC 2021-08-05 15:56:10 Belgian time |
|---|---|
| Magnitude | ML 1.2 |
| Epicentral coordinates | 50.410° N, 6.095° E Uncertainty ± 1.5 km |
| Event ID | ROB 14205 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-08-06 18:31:12 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
- 12
- Epicentral distance
- 8.9 – 145.3km
- Mean velocity, P wave
- 6.1km/s
- Mean velocity, S wave
- 3.4km/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 0.36 s. S wave: 5 measurements, root-mean-square deviation 0.36 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)11 stations | |||||
| HOUHouvegnez | 8.9 | 226 | 13:56:12.69+2.20 s | 13:56:13.04+2.55 s | 0.35 |
| TNLTernell | 19.8 | 7 | 13:56:14.27+3.78 s | 13:56:16.64+6.15 s | 2.37 |
| MEMHMembach | 23.0 | 345 | 13:56:14.84+4.35 s | 13:56:18.16+7.67 s | 3.32 |
| MEMSMembach | 23.0 | 345 | 13:56:14.85+4.36 s | 13:56:18.16+7.67 s | 3.31 |
| KLBKalborn | 34.4 | 178 | 13:56:17.37+6.88 s | 13:56:21.14+10.65 s | 3.77 |
| EBNEben-Emael | 52.2 | 326 | 13:56:19.03+8.54 s | – | – |
| CLAClavier | 56.4 | 271 | 13:56:20.19+9.70 s | – | – |
| RCHRochefort | 68.0 | 246 | 13:56:21.79+11.30 s | – | – |
| GESGesves | 71.7 | 268 | 13:56:23.39+12.90 s | – | – |
| DOUDourbes | 112.5 | 252 | 13:56:29.64+19.15 s | – | – |
| SKQSteenkerque | 145.3 | 281 | 13:56:35.64+25.15 s | – | – |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 41.1 | 344 | 13:56:17.94+7.45 s | – | – |