NAMUR (BE)
Quarry blast4 January 2018
- Magnitude
- 2.0ML
- Depth
- –
- Belgian time
- 14:25:082018-01-04
- UTC
- 13:25:082018-01-04
Main parameters
| Date and time | 2018-01-04 13:25:08 UTC 2018-01-04 14:25:08 Belgian time |
|---|---|
| Magnitude | ML 2.0 |
| Epicentral coordinates | 50.490° N, 4.942° E Uncertainty ± 1.5 km |
| Event ID | ROB 6210 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2018-01-04 14:37:46 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
- 10
- Epicentral distance
- 15.6 – 126.2km
- Mean velocity, P wave
- 5.7km/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: 9 measurements, root-mean-square deviation 0.37 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)10 stations | |||||
| GESGesves | 15.6 | 139 | 13:25:10.60+2.24 s | – | – |
| MRDMaredsous | 24.3 | 211 | 13:25:13.12+4.76 s | 13:25:16.84+8.48 s | 3.72 |
| CLAClavier | 26.8 | 107 | 13:25:12.61+4.25 s | – | – |
| DOUDourbes | 50.5 | 209 | 13:25:17.62+9.26 s | – | – |
| SKQSteenkerque | 63.6 | 286 | 13:25:19.04+10.68 s | – | – |
| HOUHouvegnez | 77.0 | 101 | 13:25:22.16+13.80 s | – | – |
| MRGMont Rigi | 80.4 | 88 | 13:25:22.12+13.76 s | – | – |
| DSLBDessel | 83.0 | 6 | 13:25:22.73+14.37 s | – | – |
| KLBKalborn | 93.8 | 117 | 13:25:24.57+16.21 s | – | – |
| WLFWalferdange | 126.2 | 136 | 13:25:30.40+22.04 s | – | – |