ROMMERSHEIM (DE)
Quarry blast4 August 2021
- Magnitude
- 1.6ML
- Depth
- –
- Belgian time
- 10:09:262021-08-04
- UTC
- 08:09:262021-08-04
Main parameters
| Date and time | 2021-08-04 08:09:26 UTC 2021-08-04 10:09:26 Belgian time |
|---|---|
| Magnitude | ML 1.6 |
| Epicentral coordinates | 50.189° N, 6.482° E Uncertainty ± 1.9 km |
| Event ID | ROB 14175 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-08-06 18:27:36 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
- 7
- Epicentral distance
- 28.4 – 135.3km
- Mean velocity, P wave
- 6.2km/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: 6 measurements, root-mean-square deviation 0.26 s. S wave: 5 measurements, root-mean-square deviation 0.22 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 | |||||
| KLBKalborn | 28.4 | 250 | 08:09:31.63+5.08 s | 08:09:35.86+9.31 s | 4.23 |
| VIAVianden | 34.7 | 215 | 08:09:32.63+6.08 s | 08:09:37.45+10.90 s | 4.82 |
| HOUHouvegnez | 38.6 | 299 | 08:09:33.44+6.89 s | 08:09:38.26+11.71 s | 4.82 |
| MRGMont Rigi | 46.0 | 321 | 08:09:34.57+8.02 s | 08:09:40.41+13.86 s | 5.84 |
| MEMHMembach | 57.5 | 324 | 08:09:37.08+10.53 s | 08:09:43.78+17.23 s | 6.70 |
| DOUDourbes | 135.3 | 266 | 08:09:49.77+23.22 s | 08:10:07.76+41.21 s | 17.99 |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 74.9 | 329 | 08:09:39.24+12.69 s | – | – |