LESSINES (BE)
Quarry blast3 February 2023
- Magnitude
- 1.9ML
- Depth
- –
- Belgian time
- 11:41:122023-02-03
- UTC
- 10:41:122023-02-03
Main parameters
| Date and time | 2023-02-03 10:41:12 UTC 2023-02-03 11:41:12 Belgian time |
|---|---|
| Magnitude | ML 1.9 |
| Epicentral coordinates | 50.742° N, 3.854° E Uncertainty ± 8.9 km |
| Event ID | ROB 18630 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2023-02-09 10:29:49 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
- 3.6 – 89.2km
- Mean velocity, P wave
- 5.2km/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 0.39 s. S wave: 4 measurements, root-mean-square deviation 0.14 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 | 3.6 | 192 | 10:41:13.11+0.69 s | 10:41:13.55+1.13 s | 0.44 |
| SKQSteenkerque | 19.1 | 123 | 10:41:15.74+3.32 s | 10:41:17.96+5.54 s | 2.22 |
| RQRRonquières | 30.3 | 120 | 10:41:17.60+5.18 s | – | – |
| BRQBracquegnies | 35.3 | 145 | 10:41:18.75+6.33 s | – | – |
| MRDMaredsous | 81.3 | 127 | 10:41:28.41+15.99 s | 10:41:36.70+24.28 s | 8.29 |
| DOUDourbes | 89.2 | 144 | 10:41:28.82+16.40 s | 10:41:39.25+26.83 s | 10.43 |