VIROINVAL (BE)
Quarry blast11 January 2019
- Magnitude
- 1.8ML
- Depth
- –
- Belgian time
- 13:48:432019-01-11
- UTC
- 12:48:432019-01-11
Main parameters
| Date and time | 2019-01-11 12:48:43 UTC 2019-01-11 13:48:43 Belgian time |
|---|---|
| Magnitude | ML 1.8 |
| Epicentral coordinates | 50.032° N, 4.556° E Uncertainty ± 4.7 km |
| Event ID | ROB 7620 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2019-01-11 15:28:12 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
- 14
- Epicentral distance
- 7.5 – 127.3km
- Mean velocity, P wave
- 5.5km/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 0.51 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)13 stations | |||||
| DOUDourbes | 7.5 | 22 | 12:48:43.90−0.02 s | – | – |
| MRDMaredsous | 33.6 | 27 | 12:48:49.75+5.83 s | 12:48:52.94+9.02 s | 3.19 |
| GESGesves | 54.6 | 44 | 12:48:53.21+9.29 s | 12:48:59.89+15.97 s | 6.68 |
| BOUBougnies | 59.0 | 313 | 12:48:54.00+10.08 s | – | – |
| RQRRonquières | 68.0 | 340 | 12:48:55.15+11.23 s | – | – |
| CLAClavier | 68.5 | 51 | 12:48:55.93+12.01 s | – | – |
| SKQSteenkerque | 76.5 | 334 | 12:48:57.94+14.02 s | – | – |
| LESLessines | 91.0 | 326 | 12:49:00.02+16.10 s | – | – |
| LCHLa Chartreuse | 100.4 | 47 | 12:49:02.06+18.14 s | – | – |
| KLBKalborn | 111.5 | 86 | 12:49:02.59+18.67 s | – | – |
| EBNEben-Emael | 116.6 | 43 | 12:49:04.63+20.71 s | – | – |
| VIAVianden | 118.6 | 95 | 12:49:04.29+20.37 s | – | – |
| MEMHMembach | 121.8 | 58 | 12:49:04.33+20.41 s | – | – |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 127.3 | 50 | 12:49:05.63+21.71 s | – | – |