ANDENNE (BE)
Quarry blast13 August 2021
- Magnitude
- 1.8ML
- Depth
- –
- Belgian time
- 13:49:222021-08-13
- UTC
- 11:49:222021-08-13
Main parameters
| Date and time | 2021-08-13 11:49:22 UTC 2021-08-13 13:49:22 Belgian time |
|---|---|
| Magnitude | ML 1.8 |
| Epicentral coordinates | 50.507° N, 4.975° E Uncertainty ± 0.8 km |
| Event ID | ROB 14235 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-08-16 09:35:18 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
- 15.7 – 92.6km
- Mean velocity, P wave
- 5.7km/s
- Mean velocity, S wave
- 3.4km/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 0.24 s. S wave: 5 measurements, root-mean-square deviation 0.21 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 | 15.7 | 150 | 11:49:24.72+2.51 s | 11:49:26.89+4.68 s | 2.17 |
| CLAClavier | 25.2 | 113 | 11:49:26.87+4.66 s | 11:49:30.05+7.84 s | 3.18 |
| RCHRochefort | 43.1 | 155 | 11:49:29.74+7.53 s | 11:49:34.73+12.52 s | 4.99 |
| LCHLa Chartreuse | 46.5 | 71 | 11:49:30.28+8.07 s | 11:49:36.04+13.83 s | 5.76 |
| DOUDourbes | 53.3 | 211 | 11:49:32.08+9.87 s | 11:49:38.18+15.97 s | 6.10 |
| RQRRonquières | 54.3 | 282 | 11:49:31.64+9.43 s | – | – |
| SKQSteenkerque | 65.3 | 284 | 11:49:33.26+11.05 s | – | – |
| MEMHMembach | 74.2 | 81 | 11:49:35.17+12.96 s | – | – |
| HOUHouvegnez | 75.1 | 103 | 11:49:35.52+13.31 s | – | – |
| MRGMont Rigi | 78.0 | 89 | 11:49:36.12+13.91 s | – | – |
| KLBKalborn | 92.6 | 119 | 11:49:38.72+16.51 s | – | – |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 73.4 | 67 | 11:49:34.97+12.76 s | – | – |