BIRRESBORN (DE)
Quarry blast7 June 2018
- Magnitude
- 1.9ML
- Depth
- –
- Belgian time
- 11:55:182018-06-07
- UTC
- 09:55:182018-06-07
Main parameters
| Date and time | 2018-06-07 09:55:18 UTC 2018-06-07 11:55:18 Belgian time |
|---|---|
| Magnitude | ML 1.9 |
| Epicentral coordinates | 50.195° N, 6.653° E Uncertainty ± 2.8 km |
| Event ID | ROB 6700 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2018-06-07 16:26:49 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
- 40.3 – 147.5km
- Mean velocity, P wave
- 5.9km/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: 4 measurements, root-mean-square deviation 0.10 s. S wave: 5 measurements, root-mean-square deviation 0.29 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)6 stations | |||||
| KLBKalborn | 40.3 | 255 | 09:55:25.43+6.44 s | 09:55:30.71+11.72 s | 5.28 |
| VIAVianden | 43.3 | 228 | 09:55:26.01+7.02 s | 09:55:31.57+12.58 s | 5.56 |
| HOUHouvegnez | 49.5 | 291 | 09:55:26.99+8.00 s | 09:55:32.59+13.60 s | 5.60 |
| MRGMont Rigi | 54.1 | 311 | – | 09:55:34.54+15.55 s | – |
| WLFWalferdange | 69.2 | 212 | 09:55:30.57+11.58 s | 09:55:38.84+19.85 s | 8.27 |
| DOUDourbes | 147.5 | 266 | 09:55:43.90+24.91 s | 09:56:02.47+43.48 s | 18.57 |