NAMUR (BE)
Quarry blast22 June 2020
- Magnitude
- 1.1ML
- Depth
- –
- Belgian time
- 12:59:282020-06-22
- UTC
- 10:59:282020-06-22
Main parameters
| Date and time | 2020-06-22 10:59:28 UTC 2020-06-22 12:59:28 Belgian time |
|---|---|
| Magnitude | ML 1.1 |
| Epicentral coordinates | 50.458° N, 4.941° E Uncertainty ± 2.6 km |
| Event ID | ROB 10315 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-06-22 13:18:34 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
- 13.2 – 39.4km
- Mean velocity, P wave
- 6.0km/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: 4 measurements, root-mean-square deviation 0.32 s. S wave: 4 measurements, root-mean-square deviation 0.30 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 | 13.2 | 128 | 10:59:31.19+2.43 s | 10:59:33.54+4.78 s | 2.35 |
| MRDMaredsous | 21.3 | 215 | 10:59:32.69+3.93 s | 10:59:35.65+6.89 s | 2.96 |
| CLAClavier | 26.0 | 100 | 10:59:33.22+4.46 s | 10:59:37.29+8.53 s | 4.07 |
| RCHRochefort | 39.4 | 149 | 10:59:36.24+7.48 s | 10:59:40.57+11.81 s | 4.33 |