FRASNES-LEZ-ANVAING (BE)
Quarry blast21 March 2023
- Magnitude
- 1.2ML
- Depth
- –
- Belgian time
- 13:02:032023-03-21
- UTC
- 12:02:032023-03-21
Main parameters
| Date and time | 2023-03-21 12:02:03 UTC 2023-03-21 13:02:03 Belgian time |
|---|---|
| Magnitude | ML 1.2 |
| Epicentral coordinates | 50.722° N, 3.588° E Uncertainty ± 8.2 km |
| Event ID | ROB 19190 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2023-03-27 11:02:11 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
- 18.1 – 126.0km
- Mean velocity, P wave
- 5.6km/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 0.48 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 | 18.1 | 94 | 12:02:06.52+3.02 s | – | – |
| SKQSteenkerque | 35.7 | 103 | 12:02:09.40+5.90 s | 12:02:14.72+11.22 s | 5.32 |
| BLRGBlaregnies | 46.3 | 152 | 12:02:11.95+8.45 s | – | – |
| SNFSeneffe | 54.6 | 115 | 12:02:11.87+8.37 s | 12:02:19.68+16.18 s | 7.81 |
| MRDMaredsous | 95.9 | 119 | 12:02:20.74+17.24 s | – | – |
| DOUDourbes | 100.0 | 134 | 12:02:20.83+17.33 s | 12:02:31.69+28.19 s | 10.86 |
| GESGesves | 112.7 | 109 | 12:02:23.39+19.89 s | – | – |
| CLAClavier | 126.0 | 105 | 12:02:25.07+21.57 s | – | – |