FRASNES-LEZ-ANVAING (BE)
Quarry blast12 October 2022
- Magnitude
- 2.1ML
- Depth
- –
- Belgian time
- 13:02:342022-10-12
- UTC
- 11:02:342022-10-12
Main parameters
| Date and time | 2022-10-12 11:02:34 UTC 2022-10-12 13:02:34 Belgian time |
|---|---|
| Magnitude | ML 2.1 |
| Epicentral coordinates | 50.687° N, 3.541° E Uncertainty ± 8.3 km |
| Event ID | ROB 17345 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2022-10-14 10:25:41 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
- 8
- Epicentral distance
- 21.5 – 194.0km
- Mean velocity, P wave
- 6.5km/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: 7 measurements, root-mean-square deviation 0.54 s. S wave: 4 measurements, root-mean-square deviation 0.81 s.
Stations farther than 120 km are left out of the fit: the first waves to reach them have travelled beneath the crust, through the mantle, where they propagate faster.
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)8 stations | |||||
| LESLessines | 21.5 | 83 | 11:02:39.45+5.13 s | 11:02:43.07+8.75 s | 3.62 |
| SKQSteenkerque | 38.4 | 96 | 11:02:40.56+6.24 s | 11:02:46.08+11.76 s | 5.52 |
| RQRRonquières | 49.3 | 100 | 11:02:42.95+8.63 s | – | – |
| SNFSeneffe | 56.2 | 110 | 11:02:43.57+9.25 s | 11:02:50.78+16.46 s | 7.21 |
| MRDMaredsous | 97.1 | 116 | 11:02:50.17+15.85 s | – | – |
| DOUDourbes | 99.8 | 131 | 11:02:51.09+16.77 s | 11:03:04.08+29.76 s | 12.99 |
| GESGesves | 114.7 | 106 | 11:02:53.72+19.40 s | – | – |
| KLBKalborn | 194.0 | 109 | 11:03:05.87+31.55 s | 11:03:27.51+53.19 s | 21.64 |