FERNELMONT (BE)
Quarry blast11 April 2017
- Magnitude
- 1.6ML
- Depth
- –
- Belgian time
- 14:18:412017-04-11
- UTC
- 12:18:412017-04-11
Main parameters
| Date and time | 2017-04-11 12:18:41 UTC 2017-04-11 14:18:41 Belgian time |
|---|---|
| Magnitude | ML 1.6 |
| Epicentral coordinates | 50.521° N, 4.937° E Uncertainty ± 2.8 km |
| Event ID | ROB 5670 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2017-04-11 14:37:28 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
- 18.5 – 251.9km
- Mean velocity, P wave
- 5.5km/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: 12 measurements, root-mean-square deviation 0.38 s. S wave: 5 measurements, root-mean-square deviation 0.39 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 | 18.5 | 145 | 12:18:43.47+2.13 s | 12:18:45.56+4.22 s | 2.09 |
| MRDMaredsous | 27.1 | 206 | 12:18:46.12+4.78 s | 12:18:49.34+8.00 s | 3.22 |
| CLAClavier | 28.3 | 113 | 12:18:45.77+4.43 s | 12:18:49.22+7.88 s | 3.45 |
| STISart Tilman | 45.0 | 81 | 12:18:49.03+7.69 s | – | – |
| RCHRochefort | 45.6 | 153 | 12:18:48.49+7.15 s | – | – |
| RQRRonquières | 51.3 | 281 | 12:18:50.35+9.01 s | – | – |
| DOUDourbes | 53.2 | 207 | 12:18:50.76+9.42 s | 12:18:56.94+15.60 s | 6.18 |
| SKQSteenkerque | 62.4 | 284 | 12:18:52.05+10.71 s | – | – |
| MEMHMembach | 76.6 | 82 | 12:18:54.67+13.33 s | 12:19:03.72+22.38 s | 9.05 |
| MEMSMembach | 76.6 | 82 | 12:18:54.74+13.40 s | – | – |
| MRGMont Rigi | 80.7 | 90 | 12:18:54.75+13.41 s | – | – |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 75.4 | 69 | 12:18:53.82+12.48 s | – | – |
| German Regional Seismic Network (BGR, Germany)1 station | |||||
| TNSTaunus Observatorium Kleiner Feldberg | 251.9 | 96 | – | 12:19:52.65+71.31 s | – |