SOIGNIES (BE)
Quarry blast23 September 2019
- Magnitude
- 1.7ML
- Depth
- –
- Belgian time
- 14:03:232019-09-23
- UTC
- 12:03:232019-09-23
Main parameters
| Date and time | 2019-09-23 12:03:23 UTC 2019-09-23 14:03:23 Belgian time |
|---|---|
| Magnitude | ML 1.7 |
| Epicentral coordinates | 50.590° N, 4.082° E Uncertainty ± 1.1 km |
| Event ID | ROB 8685 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2019-09-23 14:22:43 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
- 6.6 – 74.9km
- Mean velocity, P wave
- 5.8km/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: 7 measurements, root-mean-square deviation 0.28 s. S wave: 6 measurements, root-mean-square deviation 0.37 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 | 6.6 | 359 | 12:03:24.64+1.04 s | 12:03:26.01+2.41 s | 1.37 |
| RQRRonquières | 10.3 | 80 | 12:03:25.33+1.73 s | 12:03:27.04+3.44 s | 1.71 |
| BRQBracquegnies | 12.7 | 163 | 12:03:25.25+1.65 s | – | – |
| UCCBUccle | 30.3 | 40 | 12:03:28.80+5.20 s | 12:03:33.43+9.83 s | 4.63 |
| MRDMaredsous | 58.3 | 123 | 12:03:33.87+10.27 s | 12:03:41.19+17.59 s | 7.32 |
| DOUDourbes | 66.0 | 146 | 12:03:35.31+11.71 s | 12:03:43.64+20.04 s | 8.33 |
| GESGesves | 74.9 | 107 | 12:03:36.76+13.16 s | 12:03:45.71+22.11 s | 8.95 |