NAMUR (BE)
Quarry blast1 April 2020
- Magnitude
- 1.9ML
- Depth
- –
- Belgian time
- 14:42:182020-04-01
- UTC
- 12:42:182020-04-01
Main parameters
| Date and time | 2020-04-01 12:42:18 UTC 2020-04-01 14:42:18 Belgian time |
|---|---|
| Magnitude | ML 1.9 |
| Epicentral coordinates | 50.463° N, 4.964° E Uncertainty ± 1.5 km |
| Event ID | ROB 9685 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-04-01 15:38:48 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
- 39.1 – 91.1km
- Mean velocity, P wave
- 6.4km/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: 6 measurements, root-mean-square deviation 0.53 s. S wave: 5 measurements, root-mean-square deviation 0.47 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 | |||||
| RCHRochefort | 39.1 | 151 | 12:42:25.30+7.20 s | 12:42:30.27+12.17 s | 4.97 |
| DOUDourbes | 48.7 | 213 | 12:42:27.31+9.21 s | 12:42:32.64+14.54 s | 5.33 |
| RQRRonquières | 54.8 | 287 | 12:42:27.07+8.97 s | – | – |
| SKQSteenkerque | 66.0 | 289 | 12:42:28.72+10.62 s | 12:42:38.39+20.29 s | 9.67 |
| MEMHMembach | 75.9 | 77 | 12:42:31.17+13.07 s | 12:42:40.94+22.84 s | 9.77 |
| KLBKalborn | 91.1 | 116 | 12:42:34.02+15.92 s | 12:42:44.13+26.03 s | 10.11 |