LESSINES (BE)
Quarry blast7 April 2017
- Magnitude
- 1.6ML
- Depth
- 1.1km ± 5.4
- Belgian time
- 11:41:422017-04-07
- UTC
- 09:41:422017-04-07
Main parameters
| Date and time | 2017-04-07 09:41:42 UTC 2017-04-07 11:41:42 Belgian time |
|---|---|
| Magnitude | ML 1.6 |
| Epicentral coordinates | 50.717° N, 3.869° E Uncertainty ± 4.4 km |
| Depth of hypocenter | 1.1 ± 5.4 km |
| Event ID | ROB 5667 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2017-04-07 12:00:27 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
- 9
- Epicentral distance
- 1.9 – 151.9km
- Mean velocity, P wave
- 5.6km/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 1.1 km. P wave: 8 measurements, root-mean-square deviation 0.46 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)9 stations | ||||||
| LESLessines | 1.9 | 251 | 09:41:43.13+0.22 s | – | – | – |
| SKQSteenkerque | 16.7 | 117 | 09:41:45.75+2.84 s | 09:41:47.95+5.04 s | 2.20 | – |
| RQRRonquières | 28.0 | 116 | 09:41:47.61+4.70 s | – | – | – |
| BRQBracquegnies | 32.3 | 144 | 09:41:48.62+5.71 s | – | – | – |
| BOUBougnies | 36.8 | 172 | 09:41:49.96+7.05 s | – | – | – |
| SNFSeneffe | 37.2 | 128 | 09:41:48.29+5.38 s | – | – | – |
| MRDMaredsous | 78.7 | 126 | 09:41:56.70+13.79 s | – | – | – |
| DOUDourbes | 86.3 | 143 | 09:41:58.35+15.44 s | 09:42:07.87+24.96 s | 9.52 | 11.9 |
| MEMHMembach | 151.9 | 94 | 09:42:08.73+25.82 s | 09:42:27.35+44.44 s | 18.62 | – |