COUVIN (BE)
Quarry blast28 August 2020
- Magnitude
- 2.0ML
- Depth
- –
- Belgian time
- 12:26:152020-08-28
- UTC
- 10:26:152020-08-28
Main parameters
| Date and time | 2020-08-28 10:26:15 UTC 2020-08-28 12:26:15 Belgian time |
|---|---|
| Magnitude | ML 2.0 |
| Epicentral coordinates | 50.059° N, 4.475° E Uncertainty ± 3.2 km |
| Event ID | ROB 10755 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-08-28 16:10:55 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
- 9.5 – 129.9km
- 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: 6 measurements, root-mean-square deviation 0.41 s. S wave: 6 measurements, root-mean-square deviation 0.28 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 | 9.5 | 65 | 10:26:16.90+1.30 s | 10:26:18.95+3.35 s | 2.05 |
| MRDMaredsous | 34.2 | 38 | 10:26:21.87+6.27 s | 10:26:25.82+10.22 s | 3.95 |
| RCHRochefort | 54.8 | 78 | 10:26:24.59+8.99 s | 10:26:31.60+16.00 s | 7.01 |
| GESGesves | 56.8 | 50 | 10:26:25.56+9.96 s | 10:26:32.69+17.09 s | 7.13 |
| CLAClavier | 71.3 | 56 | 10:26:28.65+13.05 s | 10:26:36.77+21.17 s | 8.12 |
| KLBKalborn | 117.0 | 87 | 10:26:35.78+20.18 s | 10:26:50.77+35.17 s | 14.99 |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 129.9 | 52 | 10:26:37.78+22.18 s | 10:26:54.86+39.26 s | 17.08 |