NAMUR (BE)
Quarry blast31 July 2020
- Magnitude
- 1.9ML
- Depth
- –
- Belgian time
- 13:51:042020-07-31
- UTC
- 11:51:042020-07-31
Main parameters
| Date and time | 2020-07-31 11:51:04 UTC 2020-07-31 13:51:04 Belgian time |
|---|---|
| Magnitude | ML 1.9 |
| Epicentral coordinates | 50.490° N, 4.965° E Uncertainty ± 0.9 km |
| Event ID | ROB 10580 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-07-31 15:40:19 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
- 7
- Epicentral distance
- 14.5 – 92.3km
- Mean velocity, P wave
- 5.9km/s
- Mean velocity, S wave
- 3.5km/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: 7 measurements, root-mean-square deviation 0.35 s. S wave: 7 measurements, root-mean-square deviation 0.48 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 | 14.5 | 143 | 11:51:06.87+2.22 s | 11:51:08.85+4.20 s | 1.98 |
| MRDMaredsous | 25.1 | 214 | 11:51:09.42+4.77 s | 11:51:12.73+8.08 s | 3.31 |
| CLAClavier | 25.2 | 108 | 11:51:09.00+4.35 s | 11:51:12.78+8.13 s | 3.78 |
| RCHRochefort | 41.7 | 153 | 11:51:12.03+7.38 s | 11:51:17.57+12.92 s | 5.54 |
| DOUDourbes | 51.2 | 211 | 11:51:14.01+9.36 s | 11:51:20.17+15.52 s | 6.16 |
| MEMHMembach | 75.3 | 79 | 11:51:18.28+13.63 s | 11:51:26.94+22.29 s | 8.66 |
| KLBKalborn | 92.3 | 118 | 11:51:20.69+16.04 s | 11:51:30.83+26.18 s | 10.14 |