WELLIN (BE)
Quarry blast8 December 2020
- Magnitude
- 1.7ML
- Depth
- –
- Belgian time
- 16:22:072020-12-08
- UTC
- 15:22:072020-12-08
Main parameters
| Date and time | 2020-12-08 15:22:07 UTC 2020-12-08 16:22:07 Belgian time |
|---|---|
| Magnitude | ML 1.7 |
| Epicentral coordinates | 50.074° N, 5.154° E Uncertainty ± 1.2 km |
| Event ID | ROB 11495 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-12-08 16:34:50 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
- 11
- Epicentral distance
- 10.5 – 99.7km
- Mean velocity, P wave
- 5.5km/s
- Mean velocity, S wave
- 3.3km/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: 11 measurements, root-mean-square deviation 0.19 s. S wave: 5 measurements, root-mean-square deviation 0.17 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)10 stations | |||||
| RCHRochefort | 10.5 | 30 | 15:22:09.53+1.71 s | 15:22:10.93+3.11 s | 1.40 |
| GESGesves | 35.0 | 352 | 15:22:14.01+6.19 s | 15:22:18.42+10.60 s | 4.41 |
| MRDMaredsous | 37.5 | 313 | 15:22:14.24+6.42 s | 15:22:19.23+11.41 s | 4.99 |
| CLAClavier | 39.8 | 15 | 15:22:14.74+6.92 s | – | – |
| DOUDourbes | 40.1 | 274 | 15:22:14.97+7.15 s | 15:22:20.09+12.27 s | 5.12 |
| HOUHouvegnez | 68.3 | 63 | 15:22:19.81+11.99 s | – | – |
| KLBKalborn | 68.4 | 87 | 15:22:19.85+12.03 s | 15:22:28.32+20.50 s | 8.47 |
| MEMSMembach | 85.2 | 45 | 15:22:23.32+15.50 s | – | – |
| MEMHMembach | 85.2 | 45 | 15:22:23.55+15.73 s | – | – |
| SKQSteenkerque | 99.7 | 310 | 15:22:25.72+17.90 s | – | – |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 94.6 | 35 | 15:22:24.97+17.15 s | – | – |