BIRRESBORN (DE)
Quarry blast30 May 2018
- Magnitude
- 1.9ML
- Depth
- –
- Belgian time
- 12:32:322018-05-30
- UTC
- 10:32:322018-05-30
Main parameters
| Date and time | 2018-05-30 10:32:32 UTC 2018-05-30 12:32:32 Belgian time |
|---|---|
| Magnitude | ML 1.9 |
| Epicentral coordinates | 50.192° N, 6.631° E Uncertainty ± 2.5 km |
| Event ID | ROB 6640 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2018-05-30 15:42:57 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
- 5
- Epicentral distance
- 38.7 – 68.1km
- Mean velocity, P wave
- 6.1km/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 0.24 s. S wave: 5 measurements, root-mean-square deviation 0.33 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)5 stations | |||||
| KLBKalborn | 38.7 | 255 | 10:32:38.44+6.11 s | 10:32:43.83+11.50 s | 5.39 |
| VIAVianden | 42.0 | 227 | 10:32:39.02+6.69 s | 10:32:44.94+12.61 s | 5.92 |
| HOUHouvegnez | 48.2 | 292 | 10:32:39.91+7.58 s | 10:32:45.88+13.55 s | 5.97 |
| MRGMont Rigi | 53.2 | 312 | 10:32:41.34+9.01 s | 10:32:48.22+15.89 s | 6.88 |
| WLFWalferdange | 68.1 | 211 | – | 10:32:52.29+19.96 s | – |