WALCOURT (BE)
Quarry blast27 June 2018
- Magnitude
- 2.0ML
- Depth
- –
- Belgian time
- 12:08:082018-06-27
- UTC
- 10:08:082018-06-27
Main parameters
| Date and time | 2018-06-27 10:08:08 UTC 2018-06-27 12:08:08 Belgian time |
|---|---|
| Magnitude | ML 2.0 |
| Epicentral coordinates | 50.234° N, 4.496° E Uncertainty ± 2.1 km |
| Event ID | ROB 6850 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2018-07-11 10:57:28 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
- 17.0 – 134.6km
- Mean velocity, P wave
- 6.4km/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 0.28 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)7 stations | |||||
| DOUDourbes | 17.0 | 155 | 10:08:12.12+3.30 s | 10:08:14.24+5.42 s | 2.12 |
| MRDMaredsous | 20.8 | 69 | 10:08:13.26+4.44 s | 10:08:16.39+7.57 s | 3.13 |
| BRQBracquegnies | 37.6 | 317 | 10:08:15.49+6.67 s | – | – |
| GESGesves | 45.3 | 68 | 10:08:16.32+7.50 s | 10:08:21.44+12.62 s | 5.12 |
| CLAClavier | 61.0 | 70 | 10:08:19.39+10.57 s | – | – |
| OPTOpitter | 126.6 | 39 | 10:08:29.65+20.83 s | – | – |
| WLFWalferdange | 134.6 | 117 | 10:08:32.75+23.93 s | – | – |