Manternach (LU)
Quarry blast21 September 2020
- Magnitude
- 1.8ML
- Depth
- –
- Belgian time
- 09:53:382020-09-21
- UTC
- 07:53:382020-09-21
Main parameters
| Date and time | 2020-09-21 07:53:38 UTC 2020-09-21 09:53:38 Belgian time |
|---|---|
| Magnitude | ML 1.8 |
| Epicentral coordinates | 49.729° N, 6.440° E Uncertainty ± 1.4 km |
| Event ID | ROB 10920 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-09-22 00:06:23 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
- 28.6 – 121.3km
- Mean velocity, P wave
- 6.1km/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: 5 measurements, root-mean-square deviation 0.66 s. S wave: 5 measurements, root-mean-square deviation 0.50 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 | |||||
| VIAVianden | 28.6 | 323 | 07:53:43.10+5.01 s | 07:53:46.91+8.82 s | 3.81 |
| KLBKalborn | 47.6 | 330 | 07:53:46.57+8.48 s | 07:53:53.29+15.20 s | 6.72 |
| HOUHouvegnez | 76.2 | 336 | 07:53:49.92+11.83 s | 07:54:00.18+22.09 s | 10.26 |
| RCHRochefort | 99.1 | 299 | 07:53:55.23+17.14 s | 07:54:06.80+28.71 s | 11.57 |
| MEMHMembach | 102.6 | 343 | 07:53:56.21+18.12 s | 07:54:08.44+30.35 s | 12.23 |
| GESGesves | 121.3 | 308 | 07:53:58.95+20.86 s | 07:54:13.41+35.32 s | 14.46 |