LESSINES (BE)
Quarry blast15 February 2018
- Magnitude
- 2.0ML
- Depth
- –
- Belgian time
- 15:49:592018-02-15
- UTC
- 14:49:592018-02-15
Main parameters
| Date and time | 2018-02-15 14:49:59 UTC 2018-02-15 15:49:59 Belgian time |
|---|---|
| Magnitude | ML 2.0 |
| Epicentral coordinates | 50.717° N, 3.853° E Uncertainty ± 6.5 km |
| Event ID | ROB 6315 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2018-02-19 13:26:28 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
- 9
- Epicentral distance
- 0.9 – 158.9km
- Mean velocity, P wave
- 5.5km/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. Depth not determined: hypocenter placed at the surface for the calculation. P wave: 8 measurements, root-mean-square deviation 0.43 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)9 stations | |||||
| LESLessines | 0.9 | 229 | 14:49:59.72+0.12 s | – | – |
| SKQSteenkerque | 17.7 | 115 | 14:50:02.59+2.99 s | – | – |
| RQRRonquières | 29.0 | 115 | 14:50:04.36+4.76 s | – | – |
| BRQBracquegnies | 33.0 | 142 | 14:50:05.41+5.81 s | – | – |
| MRDMaredsous | 79.6 | 125 | 14:50:14.03+14.43 s | – | – |
| DOUDourbes | 87.0 | 142 | 14:50:15.52+15.92 s | – | – |
| GESGesves | 94.9 | 112 | 14:50:17.38+17.78 s | – | – |
| CLAClavier | 107.9 | 107 | 14:50:18.15+18.55 s | – | – |
| MRGMont Rigi | 158.9 | 97 | 14:50:26.66+27.06 s | – | – |