REBECQ (BE)
Quarry blast18 April 2019
- Magnitude
- 1.5ML
- Depth
- –
- Belgian time
- 11:15:182019-04-18
- UTC
- 09:15:182019-04-18
Main parameters
| Date and time | 2019-04-18 09:15:18 UTC 2019-04-18 11:15:18 Belgian time |
|---|---|
| Magnitude | ML 1.5 |
| Epicentral coordinates | 50.672° N, 4.149° E Uncertainty ± 0.7 km |
| Event ID | ROB 8050 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2019-04-18 11:35:16 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
- 5.5 – 73.7km
- Mean velocity, P wave
- 5.8km/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: 7 measurements, root-mean-square deviation 0.21 s. S wave: 4 measurements, root-mean-square deviation 0.13 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)7 stations | |||||
| SKQSteenkerque | 5.5 | 243 | 09:15:19.37+1.11 s | 09:15:20.17+1.91 s | 0.80 |
| RQRRonquières | 9.1 | 144 | 09:15:19.76+1.50 s | 09:15:20.92+2.66 s | 1.16 |
| UCCBUccle | 20.4 | 47 | 09:15:21.98+3.72 s | 09:15:24.55+6.29 s | 2.57 |
| UCCSUccle | 20.4 | 47 | 09:15:22.34+4.08 s | – | – |
| BRQBracquegnies | 21.2 | 183 | 09:15:22.43+4.17 s | – | – |
| DOUDourbes | 71.6 | 154 | 09:15:30.68+12.42 s | – | – |
| GESGesves | 73.7 | 115 | 09:15:31.20+12.94 s | 09:15:40.50+22.24 s | 9.30 |