ANDENNE (BE)
Quarry blast29 April 2020
- Magnitude
- 1.6ML
- Depth
- –
- Belgian time
- 14:32:182020-04-29
- UTC
- 12:32:182020-04-29
Main parameters
| Date and time | 2020-04-29 12:32:18 UTC 2020-04-29 14:32:18 Belgian time |
|---|---|
| Magnitude | ML 1.6 |
| Epicentral coordinates | 50.506° N, 4.975° E Uncertainty ± 0.9 km |
| Event ID | ROB 9900 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-04-29 20:49:06 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
- 10
- Epicentral distance
- 15.6 – 78.1km
- Mean velocity, P wave
- 5.7km/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: 10 measurements, root-mean-square deviation 0.35 s. S wave: 7 measurements, root-mean-square deviation 0.36 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)9 stations | |||||
| GESGesves | 15.6 | 149 | 12:32:21.18+2.54 s | 12:32:22.76+4.12 s | 1.58 |
| MRDMaredsous | 27.0 | 213 | 12:32:23.61+4.97 s | 12:32:26.87+8.23 s | 3.26 |
| TGATangissart | 33.9 | 289 | 12:32:24.73+6.09 s | 12:32:29.15+10.51 s | 4.42 |
| RCHRochefort | 43.0 | 155 | 12:32:26.00+7.36 s | 12:32:32.31+13.67 s | 6.31 |
| DOUDourbes | 53.1 | 211 | 12:32:28.61+9.97 s | 12:32:34.69+16.05 s | 6.08 |
| SKQSteenkerque | 65.3 | 284 | 12:32:29.62+10.98 s | 12:32:38.36+19.72 s | 8.74 |
| MEMHMembach | 74.3 | 81 | 12:32:31.46+12.82 s | 12:32:40.91+22.27 s | 9.45 |
| HOUHouvegnez | 75.1 | 103 | 12:32:32.24+13.60 s | – | – |
| MRGMont Rigi | 78.1 | 89 | 12:32:32.17+13.53 s | – | – |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 73.5 | 67 | 12:32:31.09+12.45 s | – | – |