LESSINES (BE)
Quarry blast25 June 2020
- Magnitude
- 1.2ML
- Depth
- –
- Belgian time
- 12:40:072020-06-25
- UTC
- 10:40:072020-06-25
Main parameters
| Date and time | 2020-06-25 10:40:07 UTC 2020-06-25 12:40:07 Belgian time |
|---|---|
| Magnitude | ML 1.2 |
| Epicentral coordinates | 50.724° N, 3.872° E Uncertainty ± 3.0 km |
| Event ID | ROB 10370 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-06-25 17:01:40 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
- 7
- Epicentral distance
- 2.5 – 86.8km
- Mean velocity, P wave
- 5.4km/s
- Mean velocity, S wave
- 3.3km/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: 7 measurements, root-mean-square deviation 0.32 s. S 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)7 stations | |||||
| LESLessines | 2.5 | 234 | 10:40:07.97+0.55 s | 10:40:08.24+0.82 s | 0.27 |
| SKQSteenkerque | 16.9 | 120 | 10:40:10.59+3.17 s | 10:40:12.44+5.02 s | 1.85 |
| RQRRonquières | 28.2 | 118 | 10:40:12.26+4.84 s | – | – |
| BRQBracquegnies | 32.9 | 145 | 10:40:13.58+6.16 s | – | – |
| UCCBUccle | 35.4 | 77 | 10:40:13.86+6.44 s | 10:40:18.39+10.97 s | 4.53 |
| TGATangissart | 47.8 | 106 | 10:40:15.65+8.23 s | – | – |
| DOUDourbes | 86.8 | 143 | 10:40:23.95+16.53 s | 10:40:33.87+26.45 s | 9.92 |