REBECQ (BE)
Quarry blast28 April 2020
- Magnitude
- 1.5ML
- Depth
- –
- Belgian time
- 11:05:092020-04-28
- UTC
- 09:05:092020-04-28
Main parameters
| Date and time | 2020-04-28 09:05:09 UTC 2020-04-28 11:05:09 Belgian time |
|---|---|
| Magnitude | ML 1.5 |
| Epicentral coordinates | 50.671° N, 4.163° E Uncertainty ± 1.3 km |
| Event ID | ROB 9905 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-04-30 09:32:13 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
- 8
- Epicentral distance
- 6.3 – 72.9km
- Mean velocity, P wave
- 5.7km/s
- Mean velocity, S wave
- 3.4km/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: 8 measurements, root-mean-square deviation 0.20 s. S wave: 4 measurements, root-mean-square deviation 0.24 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)8 stations | |||||
| SKQSteenkerque | 6.3 | 247 | 09:05:11.02+1.26 s | 09:05:11.82+2.06 s | 0.80 |
| RQRRonquières | 8.5 | 149 | 09:05:11.35+1.59 s | – | – |
| UCCBUccle | 19.8 | 45 | 09:05:13.60+3.84 s | 09:05:16.19+6.43 s | 2.59 |
| UCCSUccle | 19.8 | 45 | 09:05:13.77+4.01 s | 09:05:16.04+6.28 s | 2.27 |
| BRQBracquegnies | 21.2 | 185 | 09:05:13.86+4.10 s | – | – |
| TGATangissart | 26.5 | 106 | 09:05:14.40+4.64 s | 09:05:17.53+7.77 s | 3.13 |
| DOUDourbes | 71.1 | 154 | 09:05:22.70+12.94 s | – | – |
| GESGesves | 72.9 | 116 | 09:05:22.55+12.79 s | – | – |