FRASNES-LEZ-ANVAING (BE)
Quarry blast4 November 2022
- Magnitude
- 1.3ML
- Depth
- –
- Belgian time
- 13:00:172022-11-04
- UTC
- 12:00:172022-11-04
Main parameters
| Date and time | 2022-11-04 12:00:17 UTC 2022-11-04 13:00:17 Belgian time |
|---|---|
| Magnitude | ML 1.3 |
| Epicentral coordinates | 50.701° N, 3.552° E Uncertainty ± 5.8 km |
| Event ID | ROB 17635 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2022-11-21 14:38:09 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
- 20.6 – 133.6km
- Mean velocity, P wave
- 5.6km/s
- Mean velocity, S wave
- 3.4km/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 0.57 s. S wave: 5 measurements, root-mean-square deviation 1.15 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 | 20.6 | 87 | 12:00:21.12+3.57 s | – | – |
| SKQSteenkerque | 37.8 | 99 | 12:00:23.70+6.15 s | 12:00:29.28+11.73 s | 5.58 |
| SNFSeneffe | 56.0 | 112 | 12:00:25.94+8.39 s | 12:00:34.52+16.97 s | 8.58 |
| UCCSUccle | 58.0 | 79 | – | 12:00:32.65+15.10 s | – |
| DOUDourbes | 100.2 | 132 | 12:00:35.37+17.82 s | 12:00:45.47+27.92 s | 10.10 |
| GESGesves | 114.3 | 107 | 12:00:37.72+20.17 s | 12:00:51.76+34.21 s | 14.04 |
| CLAClavier | 127.9 | 104 | 12:00:39.62+22.07 s | – | – |
| RCHRochefort | 133.6 | 116 | 12:00:40.27+22.72 s | – | – |