NAMUR (BE)
Quarry blast16 April 2020
- Magnitude
- 1.7ML
- Depth
- –
- Belgian time
- 14:24:442020-04-16
- UTC
- 12:24:442020-04-16
Main parameters
| Date and time | 2020-04-16 12:24:44 UTC 2020-04-16 14:24:44 Belgian time |
|---|---|
| Magnitude | ML 1.7 |
| Epicentral coordinates | 50.496° N, 4.982° E Uncertainty ± 0.6 km |
| Event ID | ROB 9835 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-04-16 14:32:06 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
- 13
- Epicentral distance
- 14.5 – 77.5km
- Mean velocity, P wave
- 5.8km/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: 13 measurements, root-mean-square deviation 0.28 s. S wave: 6 measurements, root-mean-square deviation 0.19 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)12 stations | |||||
| GESGesves | 14.5 | 149 | 12:24:47.06+2.56 s | 12:24:49.14+4.64 s | 2.08 |
| CLAClavier | 24.3 | 111 | 12:24:48.48+3.98 s | – | – |
| MRDMaredsous | 26.5 | 215 | 12:24:49.59+5.09 s | 12:24:52.66+8.16 s | 3.07 |
| TGATangissart | 34.8 | 290 | 12:24:50.69+6.19 s | 12:24:54.93+10.43 s | 4.24 |
| RCHRochefort | 41.8 | 155 | 12:24:52.05+7.55 s | 12:24:57.25+12.75 s | 5.20 |
| DOUDourbes | 52.5 | 212 | 12:24:54.08+9.58 s | 12:25:00.42+15.92 s | 6.34 |
| RQRRonquières | 55.0 | 283 | 12:24:54.08+9.58 s | – | – |
| SKQSteenkerque | 66.1 | 285 | 12:24:55.90+11.40 s | – | – |
| MEMSMembach | 73.9 | 80 | 12:24:57.56+13.06 s | – | – |
| MEMHMembach | 73.9 | 80 | 12:24:57.59+13.09 s | 12:25:06.18+21.68 s | 8.59 |
| HOUHouvegnez | 74.4 | 102 | 12:24:57.87+13.37 s | – | – |
| MRGMont Rigi | 77.5 | 88 | 12:24:58.44+13.94 s | – | – |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 73.5 | 66 | 12:24:56.86+12.36 s | – | – |