NAMUR (BE)
Quarry blast14 January 2020
- Magnitude
- 1.9ML
- Depth
- –
- Belgian time
- 14:21:292020-01-14
- UTC
- 13:21:292020-01-14
Main parameters
| Date and time | 2020-01-14 13:21:29 UTC 2020-01-14 14:21:29 Belgian time |
|---|---|
| Magnitude | ML 1.9 |
| Epicentral coordinates | 50.511° N, 4.956° E Uncertainty ± 1.2 km |
| Event ID | ROB 9115 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-01-14 14:40:07 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
- 16.8 – 75.5km
- Mean velocity, P wave
- 5.6km/s
- Mean velocity, S wave
- 3.2km/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: 12 measurements, root-mean-square deviation 0.27 s. S wave: 5 measurements, root-mean-square deviation 0.58 s.
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 | 16.8 | 146 | 13:21:31.77+2.45 s | 13:21:33.34+4.02 s | 1.57 |
| CLAClavier | 26.6 | 112 | 13:21:33.73+4.41 s | 13:21:37.48+8.16 s | 3.75 |
| MRDMaredsous | 26.8 | 210 | 13:21:34.22+4.90 s | 13:21:38.20+8.88 s | 3.98 |
| TGATangissart | 32.5 | 289 | 13:21:35.04+5.72 s | – | – |
| RCHRochefort | 44.0 | 154 | 13:21:37.09+7.77 s | 13:21:42.42+13.10 s | 5.33 |
| LCHLa Chartreuse | 47.7 | 72 | 13:21:38.08+8.76 s | – | – |
| UCCBUccle | 52.8 | 307 | 13:21:38.40+9.08 s | – | – |
| DOUDourbes | 52.9 | 209 | 13:21:38.78+9.46 s | 13:21:45.52+16.20 s | 6.74 |
| SKQSteenkerque | 63.9 | 284 | 13:21:40.11+10.79 s | – | – |
| MEMSMembach | 75.5 | 81 | 13:21:42.76+13.44 s | – | – |
| MEMHMembach | 75.5 | 81 | 13:21:42.78+13.46 s | – | – |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 74.5 | 67 | 13:21:42.08+12.76 s | – | – |