ANDENNE (BE)
Quarry blast21 September 2021
- Magnitude
- 1.7ML
- Depth
- –
- Belgian time
- 14:27:542021-09-21
- UTC
- 12:27:542021-09-21
Main parameters
| Date and time | 2021-09-21 12:27:54 UTC 2021-09-21 14:27:54 Belgian time |
|---|---|
| Magnitude | ML 1.7 |
| Epicentral coordinates | 50.487° N, 4.985° E Uncertainty ± 1.1 km |
| Event ID | ROB 14460 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-09-23 13:58:27 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
- 13.4 – 90.9km
- Mean velocity, P wave
- 6.1km/s
- Mean velocity, S wave
- 3.5km/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 0.66 s. S wave: 12 measurements, root-mean-square deviation 0.71 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 | 13.4 | 147 | 12:27:57.09+2.17 s | 12:27:59.36+4.44 s | 2.27 |
| CLAClavier | 23.7 | 108 | 12:27:59.23+4.31 s | 12:28:02.21+7.29 s | 2.98 |
| MRDMaredsous | 25.7 | 217 | 12:27:59.53+4.61 s | 12:28:03.96+9.04 s | 4.43 |
| TGATangissart | 35.4 | 292 | 12:28:00.73+5.81 s | 12:28:05.68+10.76 s | 4.95 |
| RCHRochefort | 40.7 | 155 | 12:28:01.94+7.02 s | 12:28:07.74+12.82 s | 5.80 |
| SNFSeneffe | 49.8 | 273 | 12:28:02.92+8.00 s | 12:28:09.98+15.06 s | 7.06 |
| DOUDourbes | 51.7 | 213 | 12:28:04.19+9.27 s | 12:28:10.29+15.37 s | 6.10 |
| SKQSteenkerque | 66.6 | 286 | 12:28:05.51+10.59 s | 12:28:15.90+20.98 s | 10.39 |
| HOUHouvegnez | 74.0 | 101 | 12:28:07.48+12.56 s | 12:28:16.91+21.99 s | 9.43 |
| KLBKalborn | 90.9 | 118 | 12:28:10.67+15.75 s | 12:28:20.01+25.09 s | 9.34 |
| Dutch seismic network (KNMI)2 stations | |||||
| VKBValkenburg | 70.6 | 53 | 12:28:08.75+13.83 s | 12:28:15.86+20.94 s | 7.11 |
| HGNHeimansgroeve | 73.7 | 65 | 12:28:07.27+12.35 s | 12:28:17.28+22.36 s | 10.01 |