NAMUR (BE)
Quarry blast30 January 2019
- Magnitude
- 2.1ML
- Depth
- –
- Belgian time
- 14:20:362019-01-30
- UTC
- 13:20:362019-01-30
Main parameters
| Date and time | 2019-01-30 13:20:36 UTC 2019-01-30 14:20:36 Belgian time |
|---|---|
| Magnitude | ML 2.1 |
| Epicentral coordinates | 50.493° N, 4.939° E Uncertainty ± 1.7 km |
| Event ID | ROB 7755 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2019-01-30 16:31:50 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
- 12
- Epicentral distance
- 15.9 – 126.6km
- Mean velocity, P wave
- 5.6km/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 0.34 s. S wave: 8 measurements, root-mean-square deviation 0.64 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)11 stations | |||||
| GESGesves | 15.9 | 139 | 13:20:38.77+1.95 s | 13:20:40.75+3.93 s | 1.98 |
| MRDMaredsous | 24.5 | 210 | 13:20:41.45+4.63 s | 13:20:44.72+7.90 s | 3.27 |
| CLAClavier | 27.0 | 108 | 13:20:40.91+4.09 s | 13:20:44.17+7.35 s | 3.26 |
| RCHRochefort | 42.8 | 151 | 13:20:43.92+7.10 s | 13:20:49.58+12.76 s | 5.66 |
| DOUDourbes | 50.6 | 209 | 13:20:46.03+9.21 s | 13:20:53.02+16.20 s | 6.99 |
| RQRRonquières | 52.2 | 284 | 13:20:45.97+9.15 s | – | – |
| UCCBUccle | 53.1 | 310 | 13:20:45.81+8.99 s | – | – |
| UCCSUccle | 53.1 | 310 | 13:20:45.81+8.99 s | – | – |
| SKQSteenkerque | 63.3 | 286 | 13:20:47.64+10.82 s | 13:20:56.04+19.22 s | 8.40 |
| MEMHMembach | 77.0 | 80 | 13:20:50.23+13.41 s | 13:20:59.28+22.46 s | 9.05 |
| WLFWalferdange | 126.6 | 136 | 13:20:59.04+22.22 s | 13:21:12.97+36.15 s | 13.93 |
| Dutch seismic network (KNMI)1 station | |||||
| VKBValkenburg | 72.8 | 55 | 13:20:49.80+12.98 s | 13:20:58.12+21.30 s | 8.32 |