LA ROCHE-EN-ARDENNE (BE)
Quarry blast23 August 2021
- Magnitude
- 1.7ML
- Depth
- –
- Belgian time
- 17:24:162021-08-23
- UTC
- 15:24:162021-08-23
Main parameters
| Date and time | 2021-08-23 15:24:16 UTC 2021-08-23 17:24:16 Belgian time |
|---|---|
| Magnitude | ML 1.7 |
| Epicentral coordinates | 50.197° N, 5.590° E Uncertainty ± 0.6 km |
| Event ID | ROB 14320 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-08-25 16:44:57 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
- 15
- Epicentral distance
- 26.3 – 118.5km
- Mean velocity, P wave
- 5.8km/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: 15 measurements, root-mean-square deviation 0.16 s. S wave: 4 measurements, root-mean-square deviation 0.29 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)14 stations | |||||
| RCHRochefort | 26.3 | 260 | 15:24:21.19+4.57 s | 15:24:24.92+8.30 s | 3.73 |
| CLAClavier | 32.1 | 320 | 15:24:22.18+5.56 s | 15:24:26.29+9.67 s | 4.11 |
| HOUHouvegnez | 34.4 | 59 | 15:24:22.52+5.90 s | 15:24:26.51+9.89 s | 3.99 |
| KLBKalborn | 38.6 | 106 | 15:24:23.37+6.75 s | 15:24:28.35+11.73 s | 4.98 |
| GESGesves | 41.5 | 300 | 15:24:23.99+7.37 s | – | – |
| MRGMont Rigi | 49.1 | 44 | 15:24:25.24+8.62 s | – | – |
| VIAVianden | 52.6 | 123 | 15:24:25.83+9.21 s | – | – |
| MEMHMembach | 54.7 | 33 | 15:24:26.21+9.59 s | – | – |
| MEMSMembach | 54.7 | 33 | 15:24:26.35+9.73 s | – | – |
| MRDMaredsous | 59.8 | 282 | 15:24:26.98+10.36 s | – | – |
| EBNEben-Emael | 67.1 | 5 | 15:24:28.65+12.03 s | – | – |
| DOUDourbes | 72.0 | 261 | 15:24:29.06+12.44 s | – | – |
| SNFSeneffe | 99.3 | 291 | 15:24:34.16+17.54 s | – | – |
| SKQSteenkerque | 118.5 | 296 | 15:24:36.93+20.31 s | – | – |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 67.6 | 21 | 15:24:28.57+11.95 s | – | – |