ANDENNE (BE)
Quarry blast29 October 2021
- Magnitude
- 1.8ML
- Depth
- –
- Belgian time
- 13:46:062021-10-29
- UTC
- 11:46:062021-10-29
Main parameters
| Date and time | 2021-10-29 11:46:06 UTC 2021-10-29 13:46:06 Belgian time |
|---|---|
| Magnitude | ML 1.8 |
| Epicentral coordinates | 50.508° N, 4.997° E Uncertainty ± 2.9 km |
| Event ID | ROB 14655 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-10-29 16:34:59 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
- 15.1 – 91.3km
- Mean velocity, P wave
- 5.4km/s
- Mean velocity, S wave
- 3.1km/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: 12 measurements, root-mean-square deviation 0.34 s. S wave: 4 measurements, root-mean-square deviation 0.28 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)11 stations | |||||
| GESGesves | 15.1 | 155 | 11:46:09.24+2.63 s | 11:46:11.02+4.41 s | 1.78 |
| CLAClavier | 23.8 | 114 | 11:46:10.16+3.55 s | 11:46:14.18+7.57 s | 4.02 |
| MRDMaredsous | 28.1 | 216 | 11:46:11.64+5.03 s | 11:46:15.45+8.84 s | 3.81 |
| TGATangissart | 35.3 | 288 | 11:46:12.76+6.15 s | 11:46:17.17+10.56 s | 4.41 |
| RCHRochefort | 42.5 | 157 | 11:46:14.18+7.57 s | – | – |
| LCHLa Chartreuse | 45.1 | 71 | 11:46:13.91+7.30 s | – | – |
| SNFSeneffe | 50.6 | 271 | 11:46:14.95+8.34 s | – | – |
| DOUDourbes | 54.1 | 212 | 11:46:16.51+9.90 s | – | – |
| RQRRonquières | 55.8 | 282 | 11:46:16.87+10.26 s | – | – |
| HOUHouvegnez | 73.6 | 103 | 11:46:19.83+13.22 s | – | – |
| KLBKalborn | 91.3 | 119 | 11:46:23.29+16.68 s | – | – |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 72.0 | 66 | 11:46:19.44+12.83 s | – | – |