FRASNES-LEZ-ANVAING (BE)
Quarry blast4 April 2023
- Magnitude
- 1.8ML
- Depth
- –
- Belgian time
- 13:00:352023-04-04
- UTC
- 11:00:352023-04-04
Main parameters
| Date and time | 2023-04-04 11:00:35 UTC 2023-04-04 13:00:35 Belgian time |
|---|---|
| Magnitude | ML 1.8 |
| Epicentral coordinates | 50.710° N, 3.553° E Uncertainty ± 9.5 km |
| Event ID | ROB 19255 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2023-04-06 18:57:09 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
- 7
- Epicentral distance
- 37.8 – 193.9km
- 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: 5 measurements, root-mean-square deviation 0.62 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)7 stations | |||||
| SKQSteenkerque | 37.8 | 100 | 11:00:42.43+6.59 s | 11:00:47.61+11.77 s | 5.18 |
| BRQBracquegnies | 48.5 | 121 | 11:00:43.68+7.84 s | – | – |
| SNFSeneffe | 56.3 | 113 | 11:00:44.87+9.03 s | 11:00:52.23+16.39 s | 7.36 |
| DOUDourbes | 100.8 | 132 | 11:00:54.22+18.38 s | 11:01:04.68+28.84 s | 10.46 |
| GESGesves | 114.6 | 108 | 11:00:54.96+19.12 s | – | – |
| CLAClavier | 128.1 | 104 | 11:00:58.30+22.46 s | – | – |
| KLBKalborn | 193.9 | 109 | 11:01:06.63+30.79 s | – | – |