ANDENNE (BE)
Quarry blast9 July 2021
- Magnitude
- 1.7ML
- Depth
- –
- Belgian time
- 13:48:462021-07-09
- UTC
- 11:48:462021-07-09
Main parameters
| Date and time | 2021-07-09 11:48:46 UTC 2021-07-09 13:48:46 Belgian time |
|---|---|
| Magnitude | ML 1.7 |
| Epicentral coordinates | 50.507° N, 4.989° E Uncertainty ± 0.6 km |
| Event ID | ROB 13995 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-07-26 11:56:58 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
- 13
- Epicentral distance
- 15.2 – 91.7km
- 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: 13 measurements, root-mean-square deviation 0.36 s. S wave: 10 measurements, root-mean-square deviation 0.35 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)12 stations | |||||
| GESGesves | 15.2 | 153 | 11:48:49.12+2.48 s | 11:48:50.96+4.32 s | 1.84 |
| CLAClavier | 24.2 | 114 | 11:48:51.22+4.58 s | 11:48:54.19+7.55 s | 2.97 |
| MRDMaredsous | 27.7 | 215 | 11:48:51.71+5.07 s | 11:48:55.62+8.98 s | 3.91 |
| TGATangissart | 34.9 | 288 | 11:48:52.75+6.11 s | 11:48:57.35+10.71 s | 4.60 |
| RCHRochefort | 42.6 | 157 | 11:48:53.59+6.95 s | – | – |
| LCHLa Chartreuse | 45.6 | 71 | 11:48:54.35+7.71 s | 11:49:00.54+13.90 s | 6.19 |
| SNFSeneffe | 50.0 | 271 | 11:48:55.37+8.73 s | – | – |
| DOUDourbes | 53.7 | 212 | 11:48:56.39+9.75 s | 11:49:02.84+16.20 s | 6.45 |
| RQRRonquières | 55.3 | 282 | 11:48:56.18+9.54 s | – | – |
| MEMHMembach | 73.2 | 81 | 11:49:00.48+13.84 s | 11:49:08.86+22.22 s | 8.38 |
| HOUHouvegnez | 74.1 | 103 | 11:48:59.70+13.06 s | 11:49:09.61+22.97 s | 9.91 |
| KLBKalborn | 91.7 | 119 | 11:49:02.89+16.25 s | 11:49:13.75+27.11 s | 10.86 |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 72.6 | 66 | 11:48:59.26+12.62 s | 11:49:08.33+21.69 s | 9.07 |