DOCHAMPS (BE)
Quarry blast21 August 2017
- Magnitude
- 1.5ML
- Depth
- 5.2km ± 2.9
- Belgian time
- 20:13:252017-08-21
- UTC
- 18:13:252017-08-21
Main parameters
| Date and time | 2017-08-21 18:13:25 UTC 2017-08-21 20:13:25 Belgian time |
|---|---|
| Magnitude | ML 1.5 |
| Epicentral coordinates | 50.209° N, 5.605° E Uncertainty ± 0.7 km |
| Depth of hypocenter | 5.2 ± 2.9 km |
| Event ID | ROB 5855 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2017-08-22 07:16:41 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
- 17
- Epicentral distance
- 31.8 – 120.0km
- Mean velocity, P wave
- 6.0km/s
- Mean velocity, S wave
- 3.5km/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. Hypocenter at a depth of 5.2 km. P wave: 16 measurements, root-mean-square deviation 0.23 s. S wave: 8 measurements, root-mean-square deviation 0.26 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)17 stations | ||||||
| CLAClavier | 31.8 | 317 | 18:13:31.06+5.42 s | 18:13:35.33+9.69 s | 4.27 | 39.9 |
| HOUHouvegnez | 32.7 | 60 | 18:13:31.10+5.46 s | 18:13:34.83+9.19 s | 3.73 | 20.6 |
| KLBKalborn | 38.0 | 108 | 18:13:32.16+6.52 s | 18:13:36.87+11.23 s | 4.71 | – |
| STISart Tilman | 41.7 | 356 | 18:13:32.83+7.19 s | – | – | – |
| GESGesves | 41.8 | 298 | 18:13:32.83+7.19 s | – | – | – |
| MRGMont Rigi | 47.4 | 45 | 18:13:33.83+8.19 s | 18:13:39.52+13.88 s | 5.69 | – |
| LCHLa Chartreuse | 47.8 | 359 | 18:13:34.28+8.64 s | – | – | – |
| VIAVianden | 52.5 | 125 | 18:13:34.94+9.30 s | – | – | – |
| MEMHMembach | 53.0 | 33 | 18:13:34.79+9.15 s | 18:13:40.89+15.25 s | 6.10 | – |
| TNLTernell | 56.1 | 41 | 18:13:35.34+9.70 s | – | – | – |
| MRDMaredsous | 60.6 | 280 | 18:13:35.67+10.03 s | 18:13:43.47+17.83 s | 7.80 | – |
| WLFWalferdange | 72.2 | 147 | 18:13:38.17+12.53 s | – | – | – |
| DOUDourbes | 73.3 | 260 | 18:13:37.71+12.07 s | 18:13:46.91+21.27 s | 9.20 | – |
| SNFSeneffe | 99.8 | 290 | 18:13:42.91+17.27 s | – | – | – |
| RQRRonquières | 107.6 | 295 | 18:13:43.79+18.15 s | – | – | – |
| SKQSteenkerque | 118.9 | 295 | 18:13:45.63+19.99 s | 18:13:59.41+33.77 s | 13.78 | – |
| DSLBDessel | 120.0 | 342 | 18:13:46.51+20.87 s | 18:14:00.60+34.96 s | 14.09 | – |