LA ROCHE-EN-ARDENNE (BE)
Quarry blast7 September 2021
- Magnitude
- 1.6ML
- Depth
- –
- Belgian time
- 14:38:242021-09-07
- UTC
- 12:38:242021-09-07
Main parameters
| Date and time | 2021-09-07 12:38:24 UTC 2021-09-07 14:38:24 Belgian time |
|---|---|
| Magnitude | ML 1.6 |
| Epicentral coordinates | 50.208° N, 5.597° E Uncertainty ± 0.8 km |
| Event ID | ROB 14390 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-09-08 09:10:44 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
- 9
- Epicentral distance
- 27.1 – 72.7km
- Mean velocity, P wave
- 6.1km/s
- Mean velocity, S wave
- 3.6km/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: 9 measurements, root-mean-square deviation 0.20 s. S wave: 7 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)9 stations | |||||
| RCHRochefort | 27.1 | 258 | 12:38:29.66+4.84 s | 12:38:33.08+8.26 s | 3.42 |
| CLAClavier | 31.5 | 318 | 12:38:30.69+5.87 s | 12:38:35.11+10.29 s | 4.42 |
| HOUHouvegnez | 33.3 | 61 | 12:38:30.74+5.92 s | 12:38:35.03+10.21 s | 4.29 |
| KLBKalborn | 38.5 | 108 | 12:38:31.82+7.00 s | 12:38:36.31+11.49 s | 4.49 |
| GESGesves | 41.4 | 299 | 12:38:32.45+7.63 s | 12:38:37.06+12.24 s | 4.61 |
| VIAVianden | 52.9 | 125 | 12:38:34.51+9.69 s | – | – |
| MEMSMembach | 53.4 | 33 | 12:38:34.51+9.69 s | 12:38:40.46+15.64 s | 5.95 |
| MEMHMembach | 53.4 | 33 | 12:38:34.57+9.75 s | 12:38:40.33+15.51 s | 5.76 |
| DOUDourbes | 72.7 | 260 | 12:38:37.40+12.58 s | – | – |