COUVIN (BE)
Quarry blast1 April 2022
- Magnitude
- 1.7ML
- Depth
- –
- Belgian time
- 12:01:412022-04-01
- UTC
- 10:01:412022-04-01
Main parameters
| Date and time | 2022-04-01 10:01:41 UTC 2022-04-01 12:01:41 Belgian time |
|---|---|
| Magnitude | ML 1.7 |
| Epicentral coordinates | 50.069° N, 4.472° E Uncertainty ± 1.7 km |
| Event ID | ROB 15860 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2022-04-06 09:35:09 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
- 7
- Epicentral distance
- 9.2 – 129.3km
- 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: 5 measurements, root-mean-square deviation 0.35 s. S wave: 5 measurements, root-mean-square deviation 0.29 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)6 stations | |||||
| DOUDourbes | 9.2 | 72 | 10:01:42.70+1.21 s | 10:01:44.45+2.96 s | 1.75 |
| MRDMaredsous | 33.4 | 39 | 10:01:47.14+5.65 s | 10:01:51.95+10.46 s | 4.81 |
| GESGesves | 56.2 | 51 | 10:01:50.95+9.46 s | 10:01:58.31+16.82 s | 7.36 |
| CLAClavier | 70.8 | 56 | 10:01:54.27+12.78 s | 10:02:03.02+21.53 s | 8.75 |
| KLBKalborn | 117.2 | 88 | 10:02:01.70+20.21 s | 10:02:16.17+34.68 s | 14.47 |
| MEMHMembach | 124.9 | 61 | 10:02:02.83+21.34 s | 10:02:18.84+37.35 s | 16.01 |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 129.3 | 53 | 10:02:03.54+22.05 s | 10:02:19.90+38.41 s | 16.36 |