LESSINES (BE)
Quarry blast28 September 2022
- Magnitude
- 1.6ML
- Depth
- –
- Belgian time
- 12:41:062022-09-28
- UTC
- 10:41:062022-09-28
Main parameters
| Date and time | 2022-09-28 10:41:06 UTC 2022-09-28 12:41:06 Belgian time |
|---|---|
| Magnitude | ML 1.6 |
| Epicentral coordinates | 50.717° N, 3.853° E Uncertainty ± 5.1 km |
| Event ID | ROB 17465 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2022-10-27 12:49:10 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
- 8
- Epicentral distance
- 1.0 – 158.9km
- Mean velocity, P wave
- 5.2km/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 0.67 s. S wave: 4 measurements, root-mean-square deviation 0.49 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)8 stations | |||||
| LESLessines | 1.0 | 228 | 10:41:07.08+0.09 s | 10:41:07.26+0.27 s | 0.18 |
| SKQSteenkerque | 17.7 | 115 | 10:41:09.75+2.76 s | 10:41:11.40+4.41 s | 1.65 |
| RQRRonquières | 29.0 | 115 | 10:41:10.93+3.94 s | – | – |
| SNFSeneffe | 38.1 | 127 | 10:41:13.22+6.23 s | 10:41:17.81+10.82 s | 4.59 |
| DOUDourbes | 87.0 | 142 | 10:41:24.14+17.15 s | – | – |
| GESGesves | 94.9 | 112 | 10:41:25.03+18.04 s | 10:41:36.41+29.42 s | 11.38 |
| RCHRochefort | 115.9 | 122 | 10:41:28.04+21.05 s | – | – |
| MRGMont Rigi | 158.9 | 97 | 10:41:33.50+26.51 s | 10:41:52.23+45.24 s | 18.73 |