ANDENNE (BE)
Quarry blast23 July 2020
- Magnitude
- 1.6ML
- Depth
- –
- Belgian time
- 13:47:032020-07-23
- UTC
- 11:47:032020-07-23
Main parameters
| Date and time | 2020-07-23 11:47:03 UTC 2020-07-23 13:47:03 Belgian time |
|---|---|
| Magnitude | ML 1.6 |
| Epicentral coordinates | 50.505° N, 4.978° E Uncertainty ± 0.8 km |
| Event ID | ROB 10530 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-07-23 15:12:42 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
- 4
- Epicentral distance
- 15.5 – 42.8km
- Mean velocity, P wave
- 5.6km/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: 4 measurements, root-mean-square deviation 0.17 s. S wave: 4 measurements, root-mean-square deviation 0.36 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)4 stations | |||||
| GESGesves | 15.5 | 150 | 11:47:05.60+2.50 s | 11:47:07.74+4.64 s | 2.14 |
| CLAClavier | 25.0 | 112 | 11:47:07.42+4.32 s | 11:47:11.14+8.04 s | 3.72 |
| MRDMaredsous | 27.1 | 213 | 11:47:08.07+4.97 s | 11:47:12.05+8.95 s | 3.98 |
| RCHRochefort | 42.8 | 155 | 11:47:10.79+7.69 s | 11:47:16.05+12.95 s | 5.26 |