FRASNES-LEZ-ANVAING (BE)
Quarry blast26 February 2021
- Magnitude
- 1.8ML
- Depth
- –
- Belgian time
- 13:00:352021-02-26
- UTC
- 12:00:352021-02-26
Main parameters
| Date and time | 2021-02-26 12:00:35 UTC 2021-02-26 13:00:35 Belgian time |
|---|---|
| Magnitude | ML 1.8 |
| Epicentral coordinates | 50.644° N, 3.554° E Uncertainty ± 2.2 km |
| Event ID | ROB 12555 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-02-26 21:23:43 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
- 11
- Epicentral distance
- 37.2 – 130.8km
- Mean velocity, P wave
- 6.1km/s
- Mean velocity, S wave
- 3.2km/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: 10 measurements, root-mean-square deviation 0.31 s. S wave: 4 measurements, root-mean-square deviation 0.39 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)11 stations | |||||
| SKQSteenkerque | 37.2 | 89 | 12:00:42.55+6.62 s | 12:00:48.55+12.62 s | 6.00 |
| BOUBougnies | 39.7 | 135 | 12:00:42.99+7.06 s | – | – |
| RQRRonquières | 47.7 | 95 | 12:00:44.18+8.25 s | – | – |
| SNFSeneffe | 53.8 | 106 | 12:00:45.03+9.10 s | – | – |
| UCCBUccle | 59.5 | 73 | 12:00:47.03+11.10 s | – | – |
| TGATangissart | 68.7 | 93 | 12:00:47.36+11.43 s | – | – |
| OSTBOostende | 79.0 | 327 | 12:00:49.48+13.55 s | – | – |
| MRDMaredsous | 94.2 | 113 | 12:00:52.07+16.14 s | 12:01:06.10+30.17 s | 14.03 |
| DOUDourbes | 96.0 | 129 | 12:00:52.45+16.52 s | 12:01:05.83+29.90 s | 13.38 |
| GESGesves | 112.5 | 104 | 12:00:55.14+19.21 s | 12:01:11.72+35.79 s | 16.58 |
| RCHRochefort | 130.8 | 114 | 12:00:58.35+22.42 s | 12:01:15.77+39.84 s | 17.42 |