WANZE (BE)
Quarry blast30 September 2021
- Magnitude
- 1.4ML
- Depth
- –
- Belgian time
- 14:19:402021-09-30
- UTC
- 12:19:402021-09-30
Main parameters
| Date and time | 2021-09-30 12:19:40 UTC 2021-09-30 14:19:40 Belgian time |
|---|---|
| Magnitude | ML 1.4 |
| Epicentral coordinates | 50.566° N, 5.178° E Uncertainty ± 1.0 km |
| Event ID | ROB 14545 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-10-01 09:16:25 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
- 18.6 – 84.2km
- Mean velocity, P wave
- 5.7km/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: 7 measurements, root-mean-square deviation 0.12 s. S wave: 4 measurements, root-mean-square deviation 0.23 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)6 stations | |||||
| CLAClavier | 18.6 | 152 | 12:19:43.61+3.44 s | 12:19:45.53+5.36 s | 1.92 |
| GESGesves | 21.2 | 198 | 12:19:43.86+3.69 s | 12:19:46.83+6.66 s | 2.97 |
| MRDMaredsous | 41.4 | 225 | 12:19:47.44+7.27 s | 12:19:52.87+12.70 s | 5.43 |
| RCHRochefort | 45.9 | 176 | 12:19:48.38+8.21 s | 12:19:54.50+14.33 s | 6.12 |
| DOUDourbes | 66.9 | 219 | 12:19:51.93+11.76 s | – | – |
| KLBKalborn | 84.2 | 128 | 12:19:54.71+14.54 s | – | – |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 57.7 | 67 | 12:19:50.19+10.02 s | – | – |