Nohn (DE)
Quarry blast13 January 2020
- Magnitude
- 2.0ML
- Depth
- –
- Belgian time
- 10:37:362020-01-13
- UTC
- 09:37:362020-01-13
Main parameters
| Date and time | 2020-01-13 09:37:36 UTC 2020-01-13 10:37:36 Belgian time |
|---|---|
| Magnitude | ML 2.0 |
| Epicentral coordinates | 50.320° N, 6.777° E Uncertainty ± 2.9 km |
| Event ID | ROB 9105 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-01-13 11:07:30 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
- 11
- Epicentral distance
- 53.6 – 157.8km
- Mean velocity, P wave
- 5.7km/s
- Mean velocity, S wave
- 3.3km/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: 9 measurements, root-mean-square deviation 0.35 s. S wave: 4 measurements, root-mean-square deviation 0.49 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)10 stations | |||||
| KLBKalborn | 53.6 | 243 | 09:37:44.94+8.44 s | 09:37:51.65+15.15 s | 6.71 |
| MRGMont Rigi | 54.3 | 293 | 09:37:46.20+9.70 s | – | – |
| HOUHouvegnez | 55.1 | 274 | 09:37:45.18+8.68 s | 09:37:53.40+16.90 s | 8.22 |
| VIAVianden | 59.4 | 224 | 09:37:46.15+9.65 s | – | – |
| MEMSMembach | 63.3 | 301 | 09:37:47.30+10.80 s | – | – |
| MEMHMembach | 63.3 | 301 | 09:37:47.32+10.82 s | 09:37:54.81+18.31 s | 7.49 |
| CLAClavier | 105.5 | 277 | 09:37:54.63+18.13 s | – | – |
| RCHRochefort | 112.1 | 261 | 09:37:55.73+19.23 s | 09:38:09.71+33.21 s | 13.98 |
| GESGesves | 120.5 | 274 | 09:37:56.72+20.22 s | – | – |
| DOUDourbes | 157.8 | 262 | 09:38:02.71+26.21 s | 09:38:22.35+45.85 s | 19.64 |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 77.7 | 310 | 09:37:49.40+12.90 s | – | – |