COUVIN (BE)
Quarry blast28 October 2022
- Magnitude
- 1.7ML
- Depth
- –
- Belgian time
- 12:12:222022-10-28
- UTC
- 10:12:222022-10-28
Main parameters
| Date and time | 2022-10-28 10:12:22 UTC 2022-10-28 12:12:22 Belgian time |
|---|---|
| Magnitude | ML 1.7 |
| Epicentral coordinates | 49.986° N, 4.472° E Uncertainty ± 6.7 km |
| Event ID | ROB 17590 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2022-11-21 14:35:37 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
- 8
- Epicentral distance
- 15.0 – 135.7km
- Mean velocity, P wave
- 5.6km/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: 4 measurements, root-mean-square deviation 0.05 s. S wave: 4 measurements, root-mean-square deviation 0.21 s.
Stations farther than 120 km are left out of the fit: the first waves to reach them have travelled beneath the crust, through the mantle, where they propagate faster.
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)5 stations | |||||
| DOUDourbes | 15.0 | 36 | 10:12:24.40+2.32 s | 10:12:26.30+4.22 s | 1.90 |
| MRDMaredsous | 41.0 | 31 | 10:12:29.14+7.06 s | 10:12:33.29+11.21 s | 4.15 |
| RCHRochefort | 57.2 | 71 | 10:12:31.91+9.83 s | 10:12:38.28+16.20 s | 6.37 |
| GESGesves | 62.5 | 44 | 10:12:32.93+10.85 s | 10:12:39.98+17.90 s | 7.05 |
| TNLTernell | 135.7 | 60 | 10:12:45.36+23.28 s | – | – |
| Dutch seismic network (KNMI)3 stations | |||||
| TERZTerziet | 133.3 | 49 | 10:12:44.68+22.60 s | 10:13:00.02+37.94 s | 15.34 |
| HGNHeimansgroeve | 135.2 | 50 | 10:12:45.32+23.24 s | – | – |
| VKBValkenburg | 135.3 | 43 | 10:12:44.66+22.58 s | – | – |