Foisches (FR)
Quarry blast25 February 2019
- Magnitude
- 1.5ML
- Depth
- –
- Belgian time
- 12:35:042019-02-25
- UTC
- 11:35:042019-02-25
Main parameters
| Date and time | 2019-02-25 11:35:04 UTC 2019-02-25 12:35:04 Belgian time |
|---|---|
| Magnitude | ML 1.5 |
| Epicentral coordinates | 50.121° N, 4.774° E Uncertainty ± 1.0 km |
| Event ID | ROB 7880 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2019-02-25 14:55:01 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
- 4
- Epicentral distance
- 13.1 – 36.9km
- Mean velocity, P wave
- 6.0km/s
- Mean velocity, S wave
- 3.3km/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: 4 measurements, root-mean-square deviation 0.08 s. S wave: 4 measurements, root-mean-square deviation 0.28 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)4 stations | |||||
| DOUDourbes | 13.1 | 257 | 11:35:07.21+2.55 s | 11:35:09.29+4.63 s | 2.08 |
| MRDMaredsous | 20.1 | 359 | 11:35:08.53+3.87 s | 11:35:10.83+6.17 s | 2.30 |
| RCHRochefort | 32.6 | 83 | 11:35:10.63+5.97 s | 11:35:14.63+9.97 s | 4.00 |
| GESGesves | 36.9 | 37 | 11:35:11.17+6.51 s | 11:35:16.46+11.80 s | 5.29 |