LESSINES (BE)
Quarry blast31 August 2022
- Magnitude
- 1.4ML
- Depth
- –
- Belgian time
- 12:39:122022-08-31
- UTC
- 10:39:122022-08-31
Main parameters
| Date and time | 2022-08-31 10:39:12 UTC 2022-08-31 12:39:12 Belgian time |
|---|---|
| Magnitude | ML 1.4 |
| Epicentral coordinates | 50.714° N, 3.874° E Uncertainty ± 5.2 km |
| Event ID | ROB 16995 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2022-08-31 14:51:55 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 – 31.9km
- Mean velocity, P wave
- 5.3km/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: 4 measurements, root-mean-square deviation 0.17 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 | 260 | 10:39:13.02+0.51 s | 10:39:13.18+0.67 s | 0.16 |
| SKQSteenkerque | 16.3 | 116 | 10:39:15.66+3.15 s | 10:39:17.51+5.00 s | 1.85 |
| RQRRonquières | 27.6 | 116 | 10:39:17.52+5.01 s | 10:39:21.23+8.72 s | 3.71 |
| BRQBracquegnies | 31.9 | 144 | 10:39:18.80+6.29 s | – | – |
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