ROCHEFORT (BE)
Quarry blast8 January 2020
- Magnitude
- 0.9ML
- Depth
- –
- Belgian time
- 12:26:172020-01-08
- UTC
- 11:26:172020-01-08
Main parameters
| Date and time | 2020-01-08 11:26:17 UTC 2020-01-08 12:26:17 Belgian time |
|---|---|
| Magnitude | ML 0.9 |
| Epicentral coordinates | 50.186° N, 5.232° E Uncertainty ± 1.1 km |
| Event ID | ROB 9090 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-01-08 15:08:32 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
- 5
- Epicentral distance
- 3.5 – 46.7km
- 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: 5 measurements, root-mean-square deviation 0.20 s. S wave: 4 measurements, root-mean-square deviation 0.19 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)5 stations | |||||
| RCHRochefort | 3.5 | 186 | 11:26:18.52+0.72 s | – | – |
| GESGesves | 24.4 | 335 | 11:26:22.57+4.77 s | 11:26:25.76+7.96 s | 3.19 |
| CLAClavier | 26.4 | 11 | 11:26:22.63+4.83 s | 11:26:26.04+8.24 s | 3.41 |
| MRDMaredsous | 35.5 | 291 | 11:26:23.92+6.12 s | 11:26:28.99+11.19 s | 5.07 |
| DOUDourbes | 46.7 | 258 | 11:26:26.01+8.21 s | 11:26:31.94+14.14 s | 5.93 |