NAMUR (BE)
Quarry blast31 January 2019
- Magnitude
- 2.0ML
- Depth
- –
- Belgian time
- 14:17:492019-01-31
- UTC
- 13:17:492019-01-31
Main parameters
| Date and time | 2019-01-31 13:17:49 UTC 2019-01-31 14:17:49 Belgian time |
|---|---|
| Magnitude | ML 2.0 |
| Epicentral coordinates | 50.479° N, 4.966° E Uncertainty ± 0.8 km |
| Event ID | ROB 7765 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2019-01-31 16:16:00 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
- 13
- Epicentral distance
- 13.5 – 75.4km
- Mean velocity, P wave
- 6.0km/s
- Mean velocity, S wave
- 3.4km/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: 13 measurements, root-mean-square deviation 0.24 s. S wave: 9 measurements, root-mean-square deviation 0.55 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)12 stations | |||||
| GESGesves | 13.5 | 141 | 13:17:51.46+2.42 s | 13:17:52.96+3.92 s | 1.50 |
| MRDMaredsous | 24.2 | 216 | 13:17:53.89+4.85 s | 13:17:57.21+8.17 s | 3.32 |
| CLAClavier | 24.7 | 106 | 13:17:53.51+4.47 s | 13:17:56.49+7.45 s | 2.98 |
| RCHRochefort | 40.5 | 153 | 13:17:56.22+7.18 s | 13:18:01.35+12.31 s | 5.13 |
| LCHLa Chartreuse | 48.2 | 68 | 13:17:57.84+8.80 s | 13:18:03.80+14.76 s | 5.96 |
| DOUDourbes | 50.3 | 212 | 13:17:57.86+8.82 s | 13:18:04.07+15.03 s | 6.21 |
| RQRRonquières | 54.4 | 285 | 13:17:58.48+9.44 s | – | – |
| UCCBUccle | 55.6 | 310 | 13:17:58.29+9.25 s | – | – |
| UCCSUccle | 55.6 | 310 | 13:17:58.64+9.60 s | – | – |
| SKQSteenkerque | 65.6 | 287 | 13:18:00.17+11.13 s | 13:18:08.73+19.69 s | 8.56 |
| HOUHouvegnez | 75.1 | 100 | 13:18:02.25+13.21 s | – | – |
| MEMHMembach | 75.4 | 79 | 13:18:02.13+13.09 s | 13:18:12.23+23.19 s | 10.10 |
| Dutch seismic network (KNMI)1 station | |||||
| VKBValkenburg | 72.2 | 53 | 13:18:01.83+12.79 s | 13:18:09.38+20.34 s | 7.55 |