DOCHAMPS (BE)
Quarry blast22 September 2017
- Magnitude
- 1.7ML
- Depth
- 3.5km ± 5.7
- Belgian time
- 11:56:072017-09-22
- UTC
- 09:56:072017-09-22
Main parameters
| Date and time | 2017-09-22 09:56:07 UTC 2017-09-22 11:56:07 Belgian time |
|---|---|
| Magnitude | ML 1.7 |
| Epicentral coordinates | 50.218° N, 5.614° E Uncertainty ± 0.8 km |
| Depth of hypocenter | 3.5 ± 5.7 km |
| Event ID | ROB 5900 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2017-09-22 12:31:28 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
- 12
- Epicentral distance
- 28.5 – 120.4km
- Mean velocity, P wave
- 5.6km/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. Hypocenter at a depth of 3.5 km. P wave: 11 measurements, root-mean-square deviation 0.33 s. S wave: 9 measurements, root-mean-square deviation 0.33 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)12 stations | ||||||
| RCHRochefort | 28.5 | 256 | 09:56:12.43+4.51 s | 09:56:15.78+7.86 s | 3.35 | – |
| CLAClavier | 31.5 | 315 | 09:56:13.39+5.47 s | 09:56:17.52+9.60 s | 4.13 | 43.4 |
| HOUHouvegnez | 31.7 | 61 | 09:56:13.28+5.36 s | 09:56:16.70+8.78 s | 3.42 | – |
| KLBKalborn | 37.7 | 110 | 09:56:14.50+6.58 s | 09:56:19.19+11.27 s | 4.69 | – |
| STISart Tilman | 40.7 | 355 | 09:56:15.63+7.71 s | – | – | – |
| GESGesves | 41.9 | 296 | 09:56:15.02+7.10 s | 09:56:20.61+12.69 s | 5.59 | – |
| MRGMont Rigi | 46.2 | 45 | 09:56:15.92+8.00 s | 09:56:21.52+13.60 s | 5.60 | – |
| MEMHMembach | 51.8 | 33 | 09:56:17.05+9.13 s | 09:56:23.08+15.16 s | 6.03 | – |
| VIAVianden | 52.6 | 127 | 09:56:16.70+8.78 s | 09:56:23.52+15.60 s | 6.82 | – |
| WLFWalferdange | 72.7 | 148 | 09:56:20.63+12.71 s | – | – | – |
| DOUDourbes | 74.1 | 260 | 09:56:20.26+12.34 s | 09:56:30.47+22.55 s | 10.21 | – |
| BOUBougnies | 120.4 | 280 | 09:56:27.88+19.96 s | – | – | – |