LESSINES (BE)
Quarry blast17 September 2020
- Magnitude
- 1.6ML
- Depth
- –
- Belgian time
- 15:25:432020-09-17
- UTC
- 13:25:432020-09-17
Main parameters
| Date and time | 2020-09-17 13:25:43 UTC 2020-09-17 15:25:43 Belgian time |
|---|---|
| Magnitude | ML 1.6 |
| Epicentral coordinates | 50.728° N, 3.845° E Uncertainty ± 10.3 km |
| Event ID | ROB 10900 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-09-17 15:37:21 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
- 6
- Epicentral distance
- 1.9 – 95.9km
- Mean velocity, P wave
- 5.6km/s
- Mean velocity, S wave
- 3.2km/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: 6 measurements, root-mean-square deviation 0.14 s. S wave: 4 measurements, root-mean-square deviation 0.76 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)6 stations | |||||
| LESLessines | 1.9 | 184 | 13:25:43.76+0.38 s | 13:25:44.00+0.62 s | 0.24 |
| SKQSteenkerque | 18.8 | 118 | 13:25:46.47+3.09 s | 13:25:49.01+5.63 s | 2.54 |
| RQRRonquières | 30.1 | 117 | 13:25:48.34+4.96 s | – | – |
| BRQBracquegnies | 34.4 | 143 | 13:25:49.39+6.01 s | – | – |
| DOUDourbes | 88.3 | 143 | 13:25:58.90+15.52 s | 13:26:09.45+26.07 s | 10.55 |
| GESGesves | 95.9 | 113 | 13:26:00.40+17.02 s | 13:26:13.95+30.57 s | 13.55 |