WALSDORF (DE)
Quarry blast15 May 2018
- Magnitude
- 2.3ML
- Depth
- –
- Belgian time
- 10:10:362018-05-15
- UTC
- 08:10:362018-05-15
Main parameters
| Date and time | 2018-05-15 08:10:36 UTC 2018-05-15 10:10:36 Belgian time |
|---|---|
| Magnitude | ML 2.3 |
| Epicentral coordinates | 50.270° N, 6.689° E Uncertainty ± 0.5 km |
| Event ID | ROB 6615 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2018-05-16 11:24:21 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
- 45.5 – 137.0km
- Mean velocity, P wave
- 6.2km/s
- Mean velocity, S wave
- 3.5km/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: 6 measurements, root-mean-square deviation 0.26 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)7 stations | |||||
| KLBKalborn | 45.5 | 246 | 08:10:44.45+7.78 s | 08:10:50.59+13.92 s | 6.14 |
| HOUHouvegnez | 49.6 | 281 | 08:10:45.21+8.54 s | 08:10:51.26+14.59 s | 6.05 |
| VIAVianden | 51.0 | 223 | 08:10:45.64+8.97 s | 08:10:52.43+15.76 s | 6.79 |
| MRGMont Rigi | 51.3 | 302 | 08:10:45.93+9.26 s | 08:10:52.41+15.74 s | 6.48 |
| WLFWalferdange | 77.6 | 210 | 08:10:50.36+13.69 s | 08:10:59.53+22.86 s | 9.17 |
| GESGesves | 114.8 | 277 | 08:10:55.79+19.12 s | – | – |
| MRDMaredsous | 137.0 | 272 | 08:11:00.39+23.72 s | – | – |
| Network BUG1 station | |||||
| BUGBochum | 136.9 | 17 | 08:11:00.15+23.48 s | – | – |