REBECQ (BE)
Quarry blast18 February 2020
- Magnitude
- 1.2ML
- Depth
- –
- Belgian time
- 14:25:082020-02-18
- UTC
- 13:25:082020-02-18
Main parameters
| Date and time | 2020-02-18 13:25:08 UTC 2020-02-18 14:25:08 Belgian time |
|---|---|
| Magnitude | ML 1.2 |
| Epicentral coordinates | 50.665° N, 4.166° E Uncertainty ± 0.7 km |
| Event ID | ROB 9300 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-02-19 11:20:36 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
- 6.4 – 85.0km
- Mean velocity, P wave
- 5.8km/s
- Mean velocity, S wave
- 3.5km/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: 6 measurements, root-mean-square deviation 0.32 s. S wave: 5 measurements, root-mean-square deviation 0.17 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 | |||||
| SKQSteenkerque | 6.4 | 253 | 13:25:09.89+1.30 s | 13:25:10.77+2.18 s | 0.88 |
| RQRRonquières | 7.8 | 148 | 13:25:10.30+1.71 s | 13:25:11.51+2.92 s | 1.21 |
| UCCBUccle | 20.0 | 43 | 13:25:12.58+3.99 s | 13:25:14.91+6.32 s | 2.33 |
| TGATangissart | 26.0 | 105 | 13:25:13.38+4.79 s | 13:25:16.30+7.71 s | 2.92 |
| GESGesves | 72.4 | 115 | 13:25:21.96+13.37 s | 13:25:30.00+21.41 s | 8.04 |
| CLAClavier | 85.0 | 108 | 13:25:23.09+14.50 s | – | – |