GELBRESSEE (BE)
Quarry blast19 April 2017
- Magnitude
- 1.4ML
- Depth
- 7.2km ± 5.1
- Belgian time
- 14:11:552017-04-19
- UTC
- 12:11:552017-04-19
Main parameters
| Date and time | 2017-04-19 12:11:55 UTC 2017-04-19 14:11:55 Belgian time |
|---|---|
| Magnitude | ML 1.4 |
| Epicentral coordinates | 50.507° N, 4.951° E Uncertainty ± 1.4 km |
| Depth of hypocenter | 7.2 ± 5.1 km |
| Event ID | ROB 5675 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2017-04-20 07:16:51 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
- 16.7 – 127.2km
- Mean velocity, P wave
- 5.9km/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. Hypocenter at a depth of 7.2 km. P wave: 14 measurements, root-mean-square deviation 0.35 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 | nm | |
|---|---|---|---|---|---|---|
| Belgian seismic network (Royal Observatory of Belgium)15 stations | ||||||
| GESGesves | 16.7 | 144 | 12:11:58.06+2.25 s | – | – | – |
| MRDMaredsous | 26.2 | 210 | 12:12:00.69+4.88 s | – | – | – |
| CLAClavier | 26.8 | 111 | 12:12:00.12+4.31 s | 12:12:04.49+8.68 s | 4.37 | 27.4 |
| RCHRochefort | 43.8 | 153 | 12:12:03.23+7.42 s | 12:12:08.46+12.65 s | 5.23 | – |
| SNFSeneffe | 47.3 | 271 | 12:12:04.17+8.36 s | – | – | – |
| DOUDourbes | 52.4 | 209 | 12:12:05.02+9.21 s | 12:12:11.86+16.05 s | 6.84 | – |
| RQRRonquières | 52.6 | 282 | 12:12:04.14+8.33 s | – | – | – |
| SKQSteenkerque | 63.7 | 285 | 12:12:06.56+10.75 s | – | – | – |
| MEMHMembach | 75.9 | 81 | 12:12:08.29+12.48 s | 12:12:18.10+22.29 s | 9.81 | – |
| HOUHouvegnez | 76.8 | 102 | 12:12:08.68+12.87 s | – | – | – |
| MRGMont Rigi | 79.8 | 89 | 12:12:09.16+13.35 s | 12:12:19.51+23.70 s | 10.35 | – |
| TNLTernell | 84.0 | 84 | 12:12:10.34+14.53 s | – | – | – |
| KLBKalborn | 94.1 | 118 | 12:12:12.06+16.25 s | – | – | – |
| VIAVianden | 109.6 | 125 | 12:12:14.02+18.21 s | – | – | – |
| WLFWalferdange | 127.2 | 137 | 12:12:17.79+21.98 s | – | – | – |