LESSINES (BE)
Quarry blast21 September 2023
- Magnitude
- 1.1ML
- Depth
- –
- Belgian time
- 12:40:372023-09-21
- UTC
- 10:40:372023-09-21
Main parameters
| Date and time | 2023-09-21 10:40:37 UTC 2023-09-21 12:40:37 Belgian time |
|---|---|
| Magnitude | ML 1.1 |
| Epicentral coordinates | 50.739° N, 3.832° E Uncertainty ± 4.8 km |
| Event ID | ROB 20260 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2023-09-22 18:27:34 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
- 3.2 – 89.8km
- Mean velocity, P wave
- 5.5km/s
- Mean velocity, S wave
- 3.3km/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: 6 measurements, root-mean-square deviation 0.28 s. S wave: 4 measurements, root-mean-square deviation 0.26 s.
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 | 3.2 | 166 | 10:40:38.01+0.66 s | 10:40:38.21+0.86 s | 0.20 |
| SKQSteenkerque | 20.2 | 119 | 10:40:40.86+3.51 s | – | – |
| RQRRonquières | 31.5 | 118 | 10:40:42.54+5.19 s | 10:40:47.15+9.80 s | 4.61 |
| SNFSeneffe | 40.8 | 128 | 10:40:44.61+7.26 s | 10:40:49.89+12.54 s | 5.28 |
| TGATangissart | 51.0 | 107 | 10:40:46.38+9.03 s | – | – |
| DOUDourbes | 89.8 | 143 | 10:40:54.06+16.71 s | 10:41:04.20+26.85 s | 10.14 |