ANDENNE (BE)
Quarry blast19 February 2021
- Magnitude
- 1.4ML
- Depth
- –
- Belgian time
- 12:10:362021-02-19
- UTC
- 11:10:362021-02-19
Main parameters
| Date and time | 2021-02-19 11:10:36 UTC 2021-02-19 12:10:36 Belgian time |
|---|---|
| Magnitude | ML 1.4 |
| Epicentral coordinates | 50.483° N, 4.997° E Uncertainty ± 1.4 km |
| Event ID | ROB 12525 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-02-26 21:19:10 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
- 12.6 – 89.9km
- Mean velocity, P wave
- 6.2km/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 0.30 s. S wave: 7 measurements, root-mean-square deviation 0.61 s.
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)6 stations | |||||
| GESGesves | 12.6 | 150 | 11:10:38.85+2.28 s | 11:10:41.00+4.43 s | 2.15 |
| CLAClavier | 22.8 | 108 | 11:10:40.49+3.92 s | 11:10:44.16+7.59 s | 3.67 |
| MRDMaredsous | 25.9 | 219 | 11:10:41.09+4.52 s | 11:10:45.47+8.90 s | 4.38 |
| RCHRochefort | 40.0 | 156 | 11:10:43.66+7.09 s | 11:10:49.23+12.66 s | 5.57 |
| DOUDourbes | 51.8 | 214 | 11:10:45.85+9.28 s | 11:10:51.01+14.44 s | 5.16 |
| KLBKalborn | 89.9 | 118 | 11:10:52.14+15.57 s | 11:11:02.91+26.34 s | 10.77 |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 73.2 | 64 | 11:10:48.87+12.30 s | 11:10:58.78+22.21 s | 9.91 |