COUVIN (BE)
Quarry blast3 February 2021
- Magnitude
- 1.8ML
- Depth
- –
- Belgian time
- 13:02:552021-02-03
- UTC
- 12:02:552021-02-03
Main parameters
| Date and time | 2021-02-03 12:02:55 UTC 2021-02-03 13:02:55 Belgian time |
|---|---|
| Magnitude | ML 1.8 |
| Epicentral coordinates | 50.077° N, 4.481° E Uncertainty ± 2.3 km |
| Event ID | ROB 12185 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-02-08 00:20:33 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
- 8.4 – 128.3km
- 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: 5 measurements, root-mean-square deviation 0.49 s. S wave: 5 measurements, root-mean-square deviation 0.27 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 | 8.4 | 76 | 12:02:56.00+0.93 s | 12:02:57.92+2.85 s | 1.92 |
| RCHRochefort | 54.1 | 81 | 12:03:04.08+9.01 s | 12:03:11.60+16.53 s | 7.52 |
| GESGesves | 55.1 | 51 | 12:03:04.83+9.76 s | 12:03:11.89+16.82 s | 7.06 |
| CLAClavier | 69.8 | 57 | 12:03:08.04+12.97 s | 12:03:15.72+20.65 s | 7.68 |
| KLBKalborn | 116.5 | 88 | 12:03:15.26+20.19 s | 12:03:29.71+34.64 s | 14.45 |
| MEMHMembach | 123.9 | 61 | 12:03:16.17+21.10 s | 12:03:31.65+36.58 s | 15.48 |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 128.3 | 53 | 12:03:16.73+21.66 s | 12:03:32.69+37.62 s | 15.96 |