WALLERSHEIM (DE)
Quarry blast28 April 2020
- Magnitude
- 1.4ML
- Depth
- –
- Belgian time
- 08:51:282020-04-28
- UTC
- 06:51:282020-04-28
Main parameters
| Date and time | 2020-04-28 06:51:28 UTC 2020-04-28 08:51:28 Belgian time |
|---|---|
| Magnitude | ML 1.4 |
| Epicentral coordinates | 50.180° N, 6.522° E Uncertainty ± 2.0 km |
| Event ID | ROB 9890 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-05-05 08:14:11 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
- 30.8 – 138.1km
- Mean velocity, P wave
- 5.7km/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: 7 measurements, root-mean-square deviation 0.12 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 | 30.8 | 253 | 06:51:33.40+5.37 s | 06:51:37.95+9.92 s | 4.55 |
| VIAVianden | 35.6 | 220 | 06:51:34.38+6.35 s | – | – |
| HOUHouvegnez | 41.7 | 298 | 06:51:35.05+7.02 s | – | – |
| MRGMont Rigi | 48.7 | 319 | 06:51:36.56+8.53 s | – | – |
| MEMSMembach | 60.1 | 323 | 06:51:38.62+10.59 s | – | – |
| MEMHMembach | 60.1 | 323 | 06:51:38.64+10.61 s | 06:51:46.37+18.34 s | 7.73 |
| DOUDourbes | 138.1 | 267 | 06:51:50.96+22.93 s | 06:52:10.11+42.08 s | 19.15 |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 77.3 | 327 | 06:51:41.50+13.47 s | – | – |