LESSINES (BE)
Quarry blast3 February 2022
- Magnitude
- 1.2ML
- Depth
- –
- Belgian time
- 12:40:232022-02-03
- UTC
- 11:40:232022-02-03
Main parameters
| Date and time | 2022-02-03 11:40:23 UTC 2022-02-03 12:40:23 Belgian time |
|---|---|
| Magnitude | ML 1.2 |
| Epicentral coordinates | 50.708° N, 3.874° E Uncertainty ± 0.8 km |
| Event ID | ROB 15365 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2022-02-07 09:25:27 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
- 2.2 – 31.4km
- Mean velocity, P wave
- 5.5km/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 0.08 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 | 2.2 | 278 | 11:40:24.26+0.48 s | 11:40:24.48+0.70 s | 0.22 |
| SKQSteenkerque | 16.0 | 114 | 11:40:26.94+3.16 s | 11:40:28.98+5.20 s | 2.04 |
| RQRRonquières | 27.3 | 114 | 11:40:28.80+5.02 s | 11:40:32.21+8.43 s | 3.41 |
| BRQBracquegnies | 31.4 | 144 | 11:40:29.56+5.78 s | – | – |
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