FERNELMONT (BE)
Quarry blast22 June 2018
- Magnitude
- 2.1ML
- Depth
- –
- Belgian time
- 13:46:072018-06-22
- UTC
- 11:46:072018-06-22
Main parameters
| Date and time | 2018-06-22 11:46:07 UTC 2018-06-22 13:46:07 Belgian time |
|---|---|
| Magnitude | ML 2.1 |
| Epicentral coordinates | 50.511° N, 4.973° E Uncertainty ± 3.8 km |
| Event ID | ROB 6825 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2018-06-22 17:09:18 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
- 6
- Epicentral distance
- 16.2 – 126.4km
- Mean velocity, P wave
- 5.9km/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 0.19 s. S wave: 5 measurements, root-mean-square deviation 0.51 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 | |||||
| GESGesves | 16.2 | 150 | 11:46:10.22+2.32 s | 11:46:12.26+4.36 s | 2.04 |
| CLAClavier | 25.5 | 114 | 11:46:12.04+4.14 s | 11:46:15.42+7.52 s | 3.38 |
| MRDMaredsous | 27.5 | 212 | 11:46:12.56+4.66 s | 11:46:16.52+8.62 s | 3.96 |
| MRGMont Rigi | 78.1 | 90 | 11:46:21.25+13.35 s | 11:46:31.26+23.36 s | 10.01 |
| KLBKalborn | 92.9 | 119 | 11:46:23.70+15.80 s | 11:46:34.35+26.45 s | 10.65 |
| WLFWalferdange | 126.4 | 138 | 11:46:28.78+20.88 s | 11:46:43.41+35.51 s | 14.63 |