ANDENNE (BE)
Quarry blast28 July 2020
- Magnitude
- 1.8ML
- Depth
- –
- Belgian time
- 13:50:302020-07-28
- UTC
- 11:50:302020-07-28
Main parameters
| Date and time | 2020-07-28 11:50:30 UTC 2020-07-28 13:50:30 Belgian time |
|---|---|
| Magnitude | ML 1.8 |
| Epicentral coordinates | 50.506° N, 4.986° E Uncertainty ± 0.8 km |
| Event ID | ROB 10565 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-07-28 14:42:51 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
- 6
- Epicentral distance
- 15.3 – 72.8km
- Mean velocity, P wave
- 5.9km/s
- Mean velocity, S wave
- 3.3km/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: 6 measurements, root-mean-square deviation 0.19 s. S wave: 5 measurements, root-mean-square deviation 0.34 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)5 stations | |||||
| GESGesves | 15.3 | 152 | 11:50:33.03+2.53 s | 11:50:34.96+4.46 s | 1.93 |
| CLAClavier | 24.5 | 113 | 11:50:35.05+4.55 s | 11:50:38.44+7.94 s | 3.39 |
| MRDMaredsous | 27.5 | 214 | 11:50:35.53+5.03 s | 11:50:39.36+8.86 s | 3.83 |
| RCHRochefort | 42.7 | 156 | 11:50:37.79+7.29 s | 11:50:43.98+13.48 s | 6.19 |
| RQRRonquières | 55.0 | 282 | 11:50:40.14+9.64 s | – | – |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 72.8 | 66 | 11:50:43.31+12.81 s | 11:50:52.40+21.90 s | 9.09 |