ANHEE (BE)
Quarry blast9 October 2020
- Magnitude
- 0.9ML
- Depth
- –
- Belgian time
- 10:30:372020-10-09
- UTC
- 08:30:372020-10-09
Main parameters
| Date and time | 2020-10-09 08:30:37 UTC 2020-10-09 10:30:37 Belgian time |
|---|---|
| Magnitude | ML 0.9 |
| Epicentral coordinates | 50.293° N, 4.887° E Uncertainty ± 0.8 km |
| Event ID | ROB 11040 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-10-09 15:21:30 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
- 5
- Epicentral distance
- 8.5 – 32.7km
- Mean velocity, P wave
- 6.3km/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: 5 measurements, root-mean-square deviation 0.13 s. S wave: 4 measurements, root-mean-square deviation 0.28 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 | |||||
| MRDMaredsous | 8.5 | 277 | 08:30:39.35+1.67 s | – | – |
| GESGesves | 17.5 | 54 | 08:30:40.93+3.25 s | 08:30:43.90+6.22 s | 2.97 |
| RCHRochefort | 28.7 | 122 | 08:30:42.58+4.90 s | 08:30:46.65+8.97 s | 4.07 |
| DOUDourbes | 30.4 | 224 | 08:30:42.95+5.27 s | 08:30:47.71+10.03 s | 4.76 |
| CLAClavier | 32.7 | 65 | 08:30:43.53+5.85 s | 08:30:48.09+10.41 s | 4.56 |