LESSINES (BE)
Quarry blast20 September 2023
- Magnitude
- 1.3ML
- Depth
- –
- Belgian time
- 12:45:292023-09-20
- UTC
- 10:45:292023-09-20
Main parameters
| Date and time | 2023-09-20 10:45:29 UTC 2023-09-20 12:45:29 Belgian time |
|---|---|
| Magnitude | ML 1.3 |
| Epicentral coordinates | 50.717° N, 3.877° E Uncertainty ± 2.0 km |
| Event ID | ROB 20240 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2023-09-22 18:25:42 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
- 5
- Epicentral distance
- 2.5 – 36.8km
- Mean velocity, P wave
- 5.5km/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: 5 measurements, root-mean-square deviation 0.11 s. S wave: 4 measurements, root-mean-square deviation 0.06 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)5 stations | |||||
| LESLessines | 2.5 | 255 | 10:45:29.85+0.53 s | 10:45:30.14+0.82 s | 0.29 |
| SKQSteenkerque | 16.2 | 118 | 10:45:32.42+3.10 s | 10:45:34.51+5.19 s | 2.09 |
| RQRRonquières | 27.5 | 117 | 10:45:34.20+4.88 s | 10:45:37.93+8.61 s | 3.73 |
| BRQBracquegnies | 32.0 | 145 | 10:45:35.32+6.00 s | – | – |
| SNFSeneffe | 36.8 | 128 | 10:45:36.11+6.79 s | 10:45:40.70+11.38 s | 4.59 |