FOISCHES (FR)
Quarry blast12 March 2021
- Magnitude
- 1.0ML
- Depth
- –
- Belgian time
- 11:49:232021-03-12
- UTC
- 10:49:232021-03-12
Main parameters
| Date and time | 2021-03-12 10:49:23 UTC 2021-03-12 11:49:23 Belgian time |
|---|---|
| Magnitude | ML 1.0 |
| Epicentral coordinates | 50.127° N, 4.785° E Uncertainty ± 0.6 km |
| Event ID | ROB 12810 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-03-19 18:19:26 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
- 14.1 – 35.9km
- Mean velocity, P wave
- 6.6km/s
- Mean velocity, S wave
- 3.5km/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 0.11 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)4 stations | |||||
| DOUDourbes | 14.1 | 255 | 10:49:26.61+2.72 s | 10:49:28.79+4.90 s | 2.18 |
| MRDMaredsous | 19.5 | 356 | 10:49:27.66+3.77 s | 10:49:30.31+6.42 s | 2.65 |
| RCHRochefort | 31.7 | 84 | 10:49:29.34+5.45 s | 10:49:33.99+10.10 s | 4.65 |
| GESGesves | 35.9 | 37 | 10:49:30.17+6.28 s | 10:49:34.83+10.94 s | 4.66 |