LESSINES (BE)
Quarry blast9 October 2020
- Magnitude
- 1.6ML
- Depth
- –
- Belgian time
- 11:40:252020-10-09
- UTC
- 09:40:252020-10-09
Main parameters
| Date and time | 2020-10-09 09:40:25 UTC 2020-10-09 11:40:25 Belgian time |
|---|---|
| Magnitude | ML 1.6 |
| Epicentral coordinates | 50.725° N, 3.871° E Uncertainty ± 23.7 km |
| Event ID | ROB 11035 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-10-09 15:20:10 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
- 2.5 – 33.0km
- 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 0.38 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 | 2.5 | 231 | 09:40:25.84+0.56 s | 09:40:26.06+0.78 s | 0.22 |
| SKQSteenkerque | 17.0 | 120 | 09:40:28.52+3.24 s | 09:40:30.99+5.71 s | 2.47 |
| RQRRonquières | 28.3 | 118 | 09:40:29.88+4.60 s | 09:40:34.01+8.73 s | 4.13 |
| BRQBracquegnies | 33.0 | 145 | 09:40:31.80+6.52 s | – | – |
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