LESSINES (BE)
Quarry blast30 June 2021
- Magnitude
- 0.7ML
- Depth
- –
- Belgian time
- 14:13:582021-06-30
- UTC
- 12:13:582021-06-30
Main parameters
| Date and time | 2021-06-30 12:13:58 UTC 2021-06-30 14:13:58 Belgian time |
|---|---|
| Magnitude | ML 0.7 |
| Epicentral coordinates | 50.699° N, 3.860° E Uncertainty ± 3.2 km |
| Event ID | ROB 13815 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-07-05 12:22:22 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
- 1.8 – 36.6km
- Mean velocity, P wave
- 7.9km/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 1.04 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 | 1.8 | 317 | 12:13:59.22+0.77 s | 12:13:59.58+1.13 s | 0.36 |
| SKQSteenkerque | 16.5 | 110 | 12:14:02.01+3.56 s | 12:14:04.17+5.72 s | 2.16 |
| BOUBougnies | 35.0 | 170 | 12:14:02.16+3.71 s | – | – |
| SNFSeneffe | 36.6 | 125 | 12:14:05.10+6.65 s | – | – |
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