LESSINES (BE)
Quarry blast16 August 2022
- Magnitude
- 1.5ML
- Depth
- –
- Belgian time
- 14:07:472022-08-16
- UTC
- 12:07:472022-08-16
Main parameters
| Date and time | 2022-08-16 12:07:47 UTC 2022-08-16 14:07:47 Belgian time |
|---|---|
| Magnitude | ML 1.5 |
| Epicentral coordinates | 50.711° N, 3.831° E Uncertainty ± 7.2 km |
| Event ID | ROB 16840 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2022-08-17 09:52:11 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
- 0.8 – 175.6km
- Mean velocity, P wave
- 5.3km/s
- Mean velocity, S wave
- 3.2km/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: 7 measurements, root-mean-square deviation 0.30 s. S wave: 4 measurements, root-mean-square deviation 0.24 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 | 0.8 | 88 | 12:07:47.42−0.11 s | – | – |
| SKQSteenkerque | 18.9 | 111 | 12:07:50.16+2.63 s | 12:07:52.45+4.92 s | 2.29 |
| BRQBracquegnies | 33.5 | 140 | 12:07:53.16+5.63 s | – | – |
| SNFSeneffe | 39.0 | 125 | 12:07:53.73+6.20 s | 12:07:59.35+11.82 s | 5.62 |
| DOUDourbes | 87.4 | 141 | 12:08:03.36+15.83 s | – | – |
| GESGesves | 96.1 | 112 | 12:08:05.35+17.82 s | 12:08:17.07+29.54 s | 11.72 |
| CLAClavier | 109.1 | 107 | 12:08:07.21+19.68 s | 12:08:20.81+33.28 s | 13.60 |
| HOUHouvegnez | 159.1 | 104 | 12:08:14.47+26.94 s | 12:08:32.22+44.69 s | 17.75 |
| KLBKalborn | 175.6 | 112 | 12:08:16.36+28.83 s | 12:08:37.69+50.16 s | 21.33 |