NAMUR (BE)
Quarry blast19 May 2020
- Magnitude
- 1.2ML
- Depth
- –
- Belgian time
- 10:49:592020-05-19
- UTC
- 08:49:592020-05-19
Main parameters
| Date and time | 2020-05-19 08:49:59 UTC 2020-05-19 10:49:59 Belgian time |
|---|---|
| Magnitude | ML 1.2 |
| Epicentral coordinates | 50.395° N, 4.869° E Uncertainty ± 4.5 km |
| Event ID | ROB 10055 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-05-20 09:22:36 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
- 12.6 – 84.4km
- Mean velocity, P wave
- 5.2km/s
- Mean velocity, S wave
- 3.0km/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 0.15 s. S wave: 4 measurements, root-mean-square deviation 0.08 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)6 stations | |||||
| MRDMaredsous | 12.6 | 215 | 08:50:01.30+2.12 s | 08:50:03.00+3.82 s | 1.70 |
| GESGesves | 15.6 | 94 | 08:50:01.73+2.55 s | 08:50:03.96+4.78 s | 2.23 |
| CLAClavier | 30.9 | 85 | 08:50:04.62+5.44 s | – | – |
| RCHRochefort | 37.0 | 136 | 08:50:05.63+6.45 s | 08:50:10.91+11.73 s | 5.28 |
| DOUDourbes | 38.7 | 210 | 08:50:06.43+7.25 s | 08:50:11.69+12.51 s | 5.26 |
| MEMHMembach | 84.4 | 73 | 08:50:14.93+15.75 s | – | – |