LANGSUR (LU)
Quarry blast12 August 2020
- Magnitude
- 1.2ML
- Depth
- –
- Belgian time
- 09:05:482020-08-12
- UTC
- 07:05:482020-08-12
Main parameters
| Date and time | 2020-08-12 07:05:48 UTC 2020-08-12 09:05:48 Belgian time |
|---|---|
| Magnitude | ML 1.2 |
| Epicentral coordinates | 49.730° N, 6.464° E Uncertainty ± 3.3 km |
| Event ID | ROB 10645 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-08-12 10:59:23 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
- 8
- Epicentral distance
- 48.4 – 187.3km
- Mean velocity, P wave
- 6.7km/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 0.19 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 | 48.4 | 328 | 07:05:57.00+8.69 s | 07:06:03.32+15.01 s | 6.32 |
| HOUHouvegnez | 76.8 | 335 | 07:06:01.67+13.36 s | – | – |
| RCHRochefort | 100.6 | 299 | 07:06:04.74+16.43 s | 07:06:16.60+28.29 s | 11.86 |
| MEMHMembach | 103.0 | 342 | 07:06:05.30+16.99 s | 07:06:18.53+30.22 s | 13.23 |
| GESGesves | 122.6 | 307 | 07:06:09.79+21.48 s | – | – |
| DOUDourbes | 140.2 | 288 | 07:06:12.31+24.00 s | – | – |
| RQRRonquières | 187.3 | 302 | 07:06:16.88+28.57 s | – | – |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 121.1 | 342 | 07:06:09.15+20.84 s | – | – |