GEROLSTEIN (DE)
Quarry blast25 September 2020
- Magnitude
- 1.8ML
- Depth
- –
- Belgian time
- 10:26:592020-09-25
- UTC
- 08:26:592020-09-25
Main parameters
| Date and time | 2020-09-25 08:26:59 UTC 2020-09-25 10:26:59 Belgian time |
|---|---|
| Magnitude | ML 1.8 |
| Epicentral coordinates | 50.187° N, 6.649° E Uncertainty ± 3.6 km |
| Event ID | ROB 10975 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-09-29 18:49:33 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
- 39.8 – 147.2km
- Mean velocity, P wave
- 5.8km/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: 7 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 | 39.8 | 256 | 08:27:06.59+7.02 s | 08:27:11.91+12.34 s | 5.32 |
| VIAVianden | 42.6 | 229 | 08:27:07.03+7.46 s | 08:27:12.32+12.75 s | 5.29 |
| HOUHouvegnez | 49.5 | 292 | 08:27:08.28+8.71 s | – | – |
| MRGMont Rigi | 54.5 | 312 | 08:27:08.94+9.37 s | – | – |
| MEMHMembach | 65.3 | 316 | 08:27:11.45+11.88 s | 08:27:18.51+18.94 s | 7.06 |
| LCHLa Chartreuse | 90.0 | 304 | 08:27:15.13+15.56 s | – | – |
| DOUDourbes | 147.2 | 267 | 08:27:25.18+25.61 s | 08:27:43.77+44.20 s | 18.59 |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 81.9 | 322 | 08:27:13.94+14.37 s | – | – |