LESSINES (BE)
Quarry blast23 June 2021
- Magnitude
- 0.9ML
- Depth
- –
- Belgian time
- 14:46:482021-06-23
- UTC
- 12:46:482021-06-23
Main parameters
| Date and time | 2021-06-23 12:46:48 UTC 2021-06-23 14:46:48 Belgian time |
|---|---|
| Magnitude | ML 0.9 |
| Epicentral coordinates | 50.699° N, 3.857° E Uncertainty ± 14.7 km |
| Event ID | ROB 13775 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-06-28 11:09:31 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
- 1.7 – 36.7km
- 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 0.14 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 | 1.7 | 324 | 12:46:48.65+0.32 s | 12:46:48.93+0.60 s | 0.28 |
| SKQSteenkerque | 16.7 | 109 | 12:46:51.43+3.10 s | 12:46:53.67+5.34 s | 2.24 |
| RQRRonquières | 28.0 | 111 | 12:46:53.67+5.34 s | – | – |
| SNFSeneffe | 36.7 | 124 | 12:46:54.87+6.54 s | – | – |
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