ANDENNE (BE)
Quarry blast22 June 2021
- Magnitude
- 1.8ML
- Depth
- –
- Belgian time
- 13:47:092021-06-22
- UTC
- 11:47:092021-06-22
Main parameters
| Date and time | 2021-06-22 11:47:09 UTC 2021-06-22 13:47:09 Belgian time |
|---|---|
| Magnitude | ML 1.8 |
| Epicentral coordinates | 50.478° N, 4.973° E Uncertainty ± 2.8 km |
| Event ID | ROB 13760 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-06-28 10:46:32 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
- 11
- Epicentral distance
- 13.1 – 91.2km
- Mean velocity, P wave
- 5.8km/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: 11 measurements, root-mean-square deviation 0.36 s. S wave: 6 measurements, root-mean-square deviation 0.47 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)10 stations | |||||
| GESGesves | 13.1 | 142 | 11:47:11.65+2.09 s | 11:47:13.74+4.18 s | 2.09 |
| CLAClavier | 24.2 | 105 | 11:47:13.76+4.20 s | 11:47:17.04+7.48 s | 3.28 |
| TGATangissart | 35.0 | 294 | 11:47:15.31+5.75 s | 11:47:19.55+9.99 s | 4.24 |
| RCHRochefort | 40.2 | 153 | 11:47:16.42+6.86 s | 11:47:22.00+12.44 s | 5.58 |
| DOUDourbes | 50.4 | 213 | 11:47:18.90+9.34 s | – | – |
| RQRRonquières | 54.9 | 285 | 11:47:18.60+9.04 s | – | – |
| SKQSteenkerque | 66.1 | 287 | 11:47:20.31+10.75 s | 11:47:30.82+21.26 s | 10.51 |
| MEMHMembach | 74.9 | 78 | 11:47:22.51+12.95 s | 11:47:32.53+22.97 s | 10.02 |
| MEMSMembach | 74.9 | 78 | 11:47:22.54+12.98 s | – | – |
| KLBKalborn | 91.2 | 117 | 11:47:25.23+15.67 s | – | – |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 74.9 | 64 | 11:47:21.79+12.23 s | – | – |