REBECQ (BE)
Quarry blast27 August 2020
- Magnitude
- 1.6ML
- Depth
- –
- Belgian time
- 11:01:572020-08-27
- UTC
- 09:01:572020-08-27
Main parameters
| Date and time | 2020-08-27 09:01:57 UTC 2020-08-27 11:01:57 Belgian time |
|---|---|
| Magnitude | ML 1.6 |
| Epicentral coordinates | 50.677° N, 4.163° E Uncertainty ± 1.1 km |
| Event ID | ROB 10745 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-08-27 22:32:30 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
- 7
- Epicentral distance
- 6.7 – 130.8km
- Mean velocity, P wave
- 5.9km/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 0.22 s.
Stations farther than 120 km are left out of the fit: the first waves to reach them have travelled beneath the crust, through the mantle, where they propagate faster.
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 | 6.7 | 242 | 09:01:59.37+1.45 s | 09:02:00.01+2.09 s | 0.64 |
| RQRRonquières | 9.0 | 151 | 09:01:59.58+1.66 s | – | – |
| UCCBUccle | 19.3 | 46 | 09:02:01.94+4.02 s | 09:02:03.96+6.04 s | 2.02 |
| BRQBracquegnies | 21.9 | 185 | 09:02:02.21+4.29 s | – | – |
| GESGesves | 73.1 | 116 | 09:02:10.59+12.67 s | 09:02:18.93+21.01 s | 8.34 |
| MEMHMembach | 130.8 | 93 | 09:02:20.96+23.04 s | – | – |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 125.2 | 85 | 09:02:18.94+21.02 s | 09:02:34.55+36.63 s | 15.61 |