DOISCHE (BE)
Quarry blast4 April 2018
- Magnitude
- 1.8ML
- Depth
- –
- Belgian time
- 13:33:262018-04-04
- UTC
- 11:33:262018-04-04
Main parameters
| Date and time | 2018-04-04 11:33:26 UTC 2018-04-04 13:33:26 Belgian time |
|---|---|
| Magnitude | ML 1.8 |
| Epicentral coordinates | 50.150° N, 4.750° E Uncertainty ± 1.0 km |
| Event ID | ROB 6465 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2018-04-04 13:58:51 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
- 12.6 – 120.8km
- Mean velocity, P wave
- 6.0km/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 0.30 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 | |||||
| DOUDourbes | 12.6 | 241 | 11:33:29.11+2.33 s | 11:33:31.25+4.47 s | 2.14 |
| MRDMaredsous | 17.0 | 4 | 11:33:29.57+2.79 s | 11:33:33.30+6.52 s | 3.73 |
| GESGesves | 35.6 | 42 | 11:33:33.07+6.29 s | 11:33:38.06+11.28 s | 4.99 |
| CLAClavier | 49.5 | 52 | 11:33:35.41+8.63 s | – | – |
| KLBKalborn | 97.4 | 93 | 11:33:43.57+16.79 s | – | – |
| MEMSMembach | 103.2 | 60 | 11:33:43.64+16.86 s | – | – |
| WLFWalferdange | 114.2 | 118 | 11:33:46.38+19.60 s | – | – |
| MOLTMol | 120.8 | 11 | 11:33:47.01+20.23 s | – | – |