LESSINES (BE)
Quarry blast23 February 2022
- Magnitude
- 1.5ML
- Depth
- –
- Belgian time
- 12:40:432022-02-23
- UTC
- 11:40:432022-02-23
Main parameters
| Date and time | 2022-02-23 11:40:43 UTC 2022-02-23 12:40:43 Belgian time |
|---|---|
| Magnitude | ML 1.5 |
| Epicentral coordinates | 50.715° N, 3.876° E Uncertainty ± 0.4 km |
| Event ID | ROB 15545 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2022-02-28 10:00:21 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
- 4
- Epicentral distance
- 2.4 – 31.9km
- Mean velocity, P wave
- 5.4km/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: 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)4 stations | |||||
| LESLessines | 2.4 | 259 | 11:40:43.86+0.54 s | 11:40:44.05+0.73 s | 0.19 |
| SKQSteenkerque | 16.2 | 117 | 11:40:46.44+3.12 s | 11:40:48.46+5.14 s | 2.02 |
| RQRRonquières | 27.5 | 116 | 11:40:48.28+4.96 s | – | – |
| BRQBracquegnies | 31.9 | 145 | 11:40:49.48+6.16 s | – | – |
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