LESSINES (BE)
Quarry blast12 August 2020
- Magnitude
- 1.2ML
- Depth
- –
- Belgian time
- 13:21:582020-08-12
- UTC
- 11:21:582020-08-12
Main parameters
| Date and time | 2020-08-12 11:21:58 UTC 2020-08-12 13:21:58 Belgian time |
|---|---|
| Magnitude | ML 1.2 |
| Epicentral coordinates | 50.730° N, 3.891° E Uncertainty ± 3.7 km |
| Event ID | ROB 10660 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-08-12 13:58:46 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
- 4.0 – 46.8km
- Mean velocity, P wave
- 6.2km/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: 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 | 4.0 | 238 | 11:21:59.52+0.95 s | 11:21:59.81+1.24 s | 0.29 |
| SKQSteenkerque | 16.1 | 124 | 11:22:01.92+3.35 s | 11:22:03.93+5.36 s | 2.01 |
| RQRRonquières | 27.4 | 120 | 11:22:03.55+4.98 s | – | – |
| UCCBUccle | 33.9 | 77 | 11:22:04.61+6.04 s | – | – |
| TGATangissart | 46.8 | 107 | 11:22:06.45+7.88 s | – | – |
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