LESSINES (BE)
Quarry blast5 June 2018
- Magnitude
- 1.9ML
- Depth
- –
- Belgian time
- 14:11:372018-06-05
- UTC
- 12:11:372018-06-05
Main parameters
| Date and time | 2018-06-05 12:11:37 UTC 2018-06-05 14:11:37 Belgian time |
|---|---|
| Magnitude | ML 1.9 |
| Epicentral coordinates | 50.746° N, 3.845° E Uncertainty ± 7.2 km |
| Event ID | ROB 6720 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2018-06-07 16:28:56 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
- 6
- Epicentral distance
- 3.9 – 176.2km
- Mean velocity, P wave
- 5.4km/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: 5 measurements, root-mean-square deviation 0.16 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)6 stations | |||||
| LESLessines | 3.9 | 182 | 12:11:38.34+0.38 s | – | – |
| SKQSteenkerque | 19.8 | 123 | 12:11:41.03+3.07 s | 12:11:42.70+4.74 s | 1.67 |
| RQRRonquières | 31.1 | 120 | 12:11:42.87+4.91 s | – | – |
| BRQBracquegnies | 35.9 | 145 | 12:11:43.96+6.00 s | – | – |
| DOUDourbes | 89.9 | 143 | 12:11:54.09+16.13 s | 12:12:04.86+26.90 s | 10.77 |
| KLBKalborn | 176.2 | 113 | 12:12:07.04+29.08 s | 12:12:28.18+50.22 s | 21.14 |