NAMUR (BE)
Quarry blast7 April 2020
- Magnitude
- 1.6ML
- Depth
- –
- Belgian time
- 14:26:422020-04-07
- UTC
- 12:26:422020-04-07
Main parameters
| Date and time | 2020-04-07 12:26:42 UTC 2020-04-07 14:26:42 Belgian time |
|---|---|
| Magnitude | ML 1.6 |
| Epicentral coordinates | 50.488° N, 4.978° E Uncertainty ± 0.9 km |
| Event ID | ROB 9775 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-04-07 15:02:03 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
- 8
- Epicentral distance
- 13.9 – 91.5km
- Mean velocity, P wave
- 5.8km/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: 8 measurements, root-mean-square deviation 0.37 s. S wave: 7 measurements, root-mean-square deviation 0.29 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)7 stations | |||||
| GESGesves | 13.9 | 146 | 12:26:44.59+2.34 s | 12:26:46.72+4.47 s | 2.13 |
| MRDMaredsous | 25.5 | 216 | 12:26:47.06+4.81 s | 12:26:50.48+8.23 s | 3.42 |
| TGATangissart | 34.8 | 292 | 12:26:48.20+5.95 s | 12:26:53.03+10.78 s | 4.83 |
| RCHRochefort | 41.1 | 154 | 12:26:49.57+7.32 s | 12:26:54.18+11.93 s | 4.61 |
| DOUDourbes | 51.5 | 212 | 12:26:51.77+9.52 s | 12:26:57.95+15.70 s | 6.18 |
| MEMHMembach | 74.4 | 79 | 12:26:54.81+12.56 s | 12:27:04.99+22.74 s | 10.18 |
| KLBKalborn | 91.5 | 118 | 12:26:58.74+16.49 s | 12:27:09.75+27.50 s | 11.01 |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 74.2 | 65 | 12:26:54.74+12.49 s | – | – |