LESSINES (BE)
Quarry blast20 October 2020
- Magnitude
- 1.7ML
- Depth
- –
- Belgian time
- 12:40:142020-10-20
- UTC
- 10:40:142020-10-20
Main parameters
| Date and time | 2020-10-20 10:40:14 UTC 2020-10-20 12:40:14 Belgian time |
|---|---|
| Magnitude | ML 1.7 |
| Epicentral coordinates | 50.716° N, 3.876° E Uncertainty ± 3.0 km |
| Event ID | ROB 11125 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-10-20 22:57:08 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
- 5
- Epicentral distance
- 2.4 – 106.3km
- Mean velocity, P wave
- 5.4km/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: 5 measurements, root-mean-square deviation 0.16 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)5 stations | |||||
| LESLessines | 2.4 | 256 | 10:40:15.53+0.54 s | 10:40:15.73+0.74 s | 0.20 |
| SKQSteenkerque | 16.3 | 117 | 10:40:18.18+3.19 s | 10:40:20.13+5.14 s | 1.95 |
| RQRRonquières | 27.6 | 116 | 10:40:20.20+5.21 s | – | – |
| UCCBUccle | 35.3 | 75 | 10:40:21.24+6.25 s | – | – |
| CLAClavier | 106.3 | 108 | 10:40:34.74+19.75 s | – | – |
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