NAMUR (BE)
Quarry blast25 March 2020
- Magnitude
- 1.8ML
- Depth
- –
- Belgian time
- 14:35:462020-03-25
- UTC
- 13:35:462020-03-25
Main parameters
| Date and time | 2020-03-25 13:35:46 UTC 2020-03-25 14:35:46 Belgian time |
|---|---|
| Magnitude | ML 1.8 |
| Epicentral coordinates | 50.501° N, 4.977° E Uncertainty ± 1.0 km |
| Event ID | ROB 9615 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-03-25 15:32:58 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
- 9
- Epicentral distance
- 15.0 – 107.7km
- Mean velocity, P wave
- 5.7km/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: 9 measurements, root-mean-square deviation 0.36 s. S wave: 7 measurements, root-mean-square deviation 0.42 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)8 stations | |||||
| GESGesves | 15.0 | 149 | 13:35:49.05+2.34 s | 13:35:50.75+4.04 s | 1.70 |
| CLAClavier | 24.8 | 111 | 13:35:50.84+4.13 s | – | – |
| MRDMaredsous | 26.6 | 214 | 13:35:51.64+4.93 s | 13:35:54.97+8.26 s | 3.33 |
| RCHRochefort | 42.4 | 155 | 13:35:54.09+7.38 s | 13:35:59.79+13.08 s | 5.70 |
| DOUDourbes | 52.7 | 211 | 13:35:56.51+9.80 s | 13:36:02.87+16.16 s | 6.36 |
| MEMHMembach | 74.2 | 80 | 13:35:59.97+13.26 s | 13:36:08.58+21.87 s | 8.61 |
| KLBKalborn | 92.1 | 118 | 13:36:02.27+15.56 s | 13:36:13.35+26.64 s | 11.08 |
| VIAVianden | 107.7 | 125 | 13:36:06.06+19.35 s | 13:36:18.51+31.80 s | 12.45 |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 73.6 | 66 | 13:35:59.72+13.01 s | – | – |