ANDENNE (BE)
Quarry blast9 December 2020
- Magnitude
- 1.8ML
- Depth
- –
- Belgian time
- 14:26:442020-12-09
- UTC
- 13:26:442020-12-09
Main parameters
| Date and time | 2020-12-09 13:26:44 UTC 2020-12-09 14:26:44 Belgian time |
|---|---|
| Magnitude | ML 1.8 |
| Epicentral coordinates | 50.501° N, 4.991° E Uncertainty ± 0.9 km |
| Event ID | ROB 11515 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-12-12 14:47:25 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
- 14.6 – 91.3km
- Mean velocity, P wave
- 6.2km/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: 8 measurements, root-mean-square deviation 0.32 s. S wave: 7 measurements, root-mean-square deviation 0.41 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)7 stations | |||||
| GESGesves | 14.6 | 152 | 13:26:47.05+2.37 s | 13:26:49.13+4.45 s | 2.08 |
| CLAClavier | 23.9 | 112 | 13:26:48.87+4.19 s | 13:26:52.63+7.95 s | 3.76 |
| MRDMaredsous | 27.3 | 216 | 13:26:49.53+4.85 s | 13:26:53.53+8.85 s | 4.00 |
| RCHRochefort | 42.0 | 156 | 13:26:52.17+7.49 s | 13:26:58.28+13.60 s | 6.11 |
| DOUDourbes | 53.3 | 212 | 13:26:54.31+9.63 s | 13:27:00.57+15.89 s | 6.26 |
| HOUHouvegnez | 73.9 | 102 | 13:26:57.49+12.81 s | – | – |
| KLBKalborn | 91.3 | 119 | 13:26:59.69+15.01 s | 13:27:11.56+26.88 s | 11.87 |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 72.7 | 66 | 13:26:57.15+12.47 s | 13:27:06.27+21.59 s | 9.12 |