WELLIN (BE)
Quarry blast18 March 2020
- Magnitude
- 1.5ML
- Depth
- –
- Belgian time
- 13:56:262020-03-18
- UTC
- 12:56:262020-03-18
Main parameters
| Date and time | 2020-03-18 12:56:26 UTC 2020-03-18 13:56:26 Belgian time |
|---|---|
| Magnitude | ML 1.5 |
| Epicentral coordinates | 50.080° N, 5.131° E Uncertainty ± 1.1 km |
| Event ID | ROB 9510 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-03-18 14:11:47 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
- 15
- Epicentral distance
- 10.8 – 120.2km
- 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: 14 measurements, root-mean-square deviation 0.34 s. S wave: 6 measurements, root-mean-square deviation 0.54 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)14 stations | |||||
| RCHRochefort | 10.8 | 40 | 12:56:28.13+1.33 s | 12:56:30.05+3.25 s | 1.92 |
| GESGesves | 34.0 | 355 | 12:56:32.59+5.79 s | 12:56:37.01+10.21 s | 4.42 |
| MRDMaredsous | 35.8 | 314 | 12:56:33.10+6.30 s | 12:56:38.16+11.36 s | 5.06 |
| DOUDourbes | 38.4 | 273 | 12:56:33.64+6.84 s | 12:56:38.58+11.78 s | 4.94 |
| CLAClavier | 39.6 | 18 | 12:56:33.34+6.54 s | – | – |
| HOUHouvegnez | 69.4 | 64 | 12:56:38.67+11.87 s | – | – |
| KLBKalborn | 70.0 | 88 | 12:56:38.91+12.11 s | – | – |
| LCHLa Chartreuse | 70.5 | 28 | 12:56:39.43+12.63 s | – | – |
| VIAVianden | 78.5 | 101 | 12:56:39.95+13.15 s | 12:56:49.18+22.38 s | 9.23 |
| MRGMont Rigi | 82.6 | 54 | 12:56:40.67+13.87 s | – | – |
| MEMSMembach | 85.9 | 46 | 12:56:42.03+15.23 s | – | – |
| MEMHMembach | 85.9 | 46 | 12:56:42.10+15.30 s | – | – |
| EBNEben-Emael | 88.7 | 26 | 12:56:42.61+15.81 s | – | – |
| OPTBOpitter | 120.2 | 17 | 12:56:48.11+21.31 s | – | – |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 95.0 | 36 | 12:56:43.84+17.04 s | 12:56:55.36+28.56 s | 11.52 |