LESSINES (BE)
Quarry blast6 July 2018
- Magnitude
- 1.9ML
- Depth
- –
- Belgian time
- 11:40:222018-07-06
- UTC
- 09:40:222018-07-06
Main parameters
| Date and time | 2018-07-06 09:40:22 UTC 2018-07-06 11:40:22 Belgian time |
|---|---|
| Magnitude | ML 1.9 |
| Epicentral coordinates | 50.713° N, 3.869° E Uncertainty ± 7.0 km |
| Event ID | ROB 6905 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2018-07-11 11:03:13 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
- 10
- Epicentral distance
- 1.9 – 151.8km
- Mean velocity, P wave
- 5.3km/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. Depth not determined: hypocenter placed at the surface for the calculation. P wave: 9 measurements, root-mean-square deviation 0.40 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)10 stations | |||||
| LESLessines | 1.9 | 263 | 09:40:22.75−0.23 s | – | – |
| SKQSteenkerque | 16.5 | 115 | 09:40:25.39+2.41 s | – | – |
| RQRRonquières | 27.8 | 115 | 09:40:27.22+4.24 s | – | – |
| BRQBracquegnies | 32.0 | 144 | 09:40:28.41+5.43 s | – | – |
| BOUBougnies | 36.4 | 172 | 09:40:29.66+6.68 s | – | – |
| MRDMaredsous | 78.4 | 125 | 09:40:37.65+14.67 s | 09:40:45.73+22.75 s | 8.08 |
| DOUDourbes | 85.9 | 143 | 09:40:37.92+14.94 s | 09:40:48.38+25.40 s | 10.46 |
| GESGesves | 93.7 | 112 | 09:40:40.65+17.67 s | – | – |
| CLAClavier | 106.6 | 107 | 09:40:42.22+19.24 s | – | – |
| MEMSMembach | 151.8 | 94 | 09:40:48.25+25.27 s | 09:41:06.74+43.76 s | 18.49 |