NAMUR (BE)
Quarry blast29 January 2020
- Magnitude
- 1.7ML
- Depth
- –
- Belgian time
- 14:21:182020-01-29
- UTC
- 13:21:182020-01-29
Main parameters
| Date and time | 2020-01-29 13:21:18 UTC 2020-01-29 14:21:18 Belgian time |
|---|---|
| Magnitude | ML 1.7 |
| Epicentral coordinates | 50.496° N, 4.976° E Uncertainty ± 0.9 km |
| Event ID | ROB 9195 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-01-30 13:10:26 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
- 15
- Epicentral distance
- 14.7 – 92.0km
- 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: 15 measurements, root-mean-square deviation 0.29 s. S wave: 5 measurements, root-mean-square deviation 0.17 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)14 stations | |||||
| GESGesves | 14.7 | 147 | 13:21:20.50+2.20 s | 13:21:22.42+4.12 s | 1.92 |
| CLAClavier | 24.7 | 110 | 13:21:22.61+4.31 s | 13:21:26.01+7.71 s | 3.40 |
| MRDMaredsous | 26.2 | 214 | 13:21:23.13+4.83 s | – | – |
| TGATangissart | 34.4 | 291 | 13:21:24.08+5.78 s | 13:21:28.67+10.37 s | 4.59 |
| RCHRochefort | 42.0 | 155 | 13:21:25.74+7.44 s | 13:21:31.20+12.90 s | 5.46 |
| DOUDourbes | 52.2 | 211 | 13:21:27.47+9.17 s | 13:21:34.23+15.93 s | 6.76 |
| RQRRonquières | 54.6 | 283 | 13:21:28.18+9.88 s | – | – |
| UCCSUccle | 54.9 | 308 | 13:21:28.00+9.70 s | – | – |
| SKQSteenkerque | 65.7 | 285 | 13:21:29.11+10.81 s | – | – |
| BOUBougnies | 74.2 | 261 | 13:21:31.55+13.25 s | – | – |
| MEMSMembach | 74.4 | 80 | 13:21:31.54+13.24 s | – | – |
| HOUHouvegnez | 74.8 | 102 | 13:21:31.47+13.17 s | – | – |
| MRGMont Rigi | 78.0 | 88 | 13:21:31.73+13.43 s | – | – |
| KLBKalborn | 92.0 | 118 | 13:21:34.69+16.39 s | – | – |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 73.9 | 66 | 13:21:30.83+12.53 s | – | – |