ANDENNE (BE)
Quarry blast18 May 2018
- Magnitude
- 1.7ML
- Depth
- –
- Belgian time
- 12:09:312018-05-18
- UTC
- 10:09:312018-05-18
Main parameters
| Date and time | 2018-05-18 10:09:31 UTC 2018-05-18 12:09:31 Belgian time |
|---|---|
| Magnitude | ML 1.7 |
| Epicentral coordinates | 50.466° N, 5.000° E Uncertainty ± 1.8 km |
| Event ID | ROB 6675 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2018-05-30 15:46:07 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
- 8
- Epicentral distance
- 10.9 – 121.4km
- Mean velocity, P wave
- 5.8km/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: 7 measurements, root-mean-square deviation 0.16 s. S wave: 4 measurements, root-mean-square deviation 0.24 s.
Stations farther than 120 km are left out of the fit: the first waves to reach them have travelled beneath the crust, through the mantle, where they propagate faster.
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 | 10.9 | 146 | 10:09:32.96+1.82 s | 10:09:34.79+3.65 s | 1.83 |
| CLAClavier | 22.0 | 104 | 10:09:34.87+3.73 s | 10:09:38.41+7.27 s | 3.54 |
| MRDMaredsous | 24.6 | 222 | 10:09:35.45+4.31 s | 10:09:38.97+7.83 s | 3.52 |
| DOUDourbes | 50.4 | 215 | 10:09:40.17+9.03 s | 10:09:46.45+15.31 s | 6.28 |
| MRGMont Rigi | 76.4 | 86 | 10:09:44.42+13.28 s | – | – |
| KLBKalborn | 88.9 | 117 | 10:09:46.65+15.51 s | – | – |
| VIAVianden | 104.1 | 124 | 10:09:49.14+18.00 s | – | – |
| WLFWalferdange | 121.4 | 137 | 10:09:52.06+20.92 s | – | – |