ALLERBORN (LU)
Quarry blast23 September 2021
- Magnitude
- 1.3ML
- Depth
- –
- Belgian time
- 12:59:072021-09-23
- UTC
- 10:59:072021-09-23
Main parameters
| Date and time | 2021-09-23 10:59:07 UTC 2021-09-23 12:59:07 Belgian time |
|---|---|
| Magnitude | ML 1.3 |
| Epicentral coordinates | 50.033° N, 5.864° E Uncertainty ± 1.5 km |
| Event ID | ROB 14475 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-09-29 14:05:47 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
- 5
- Epicentral distance
- 19.1 – 64.9km
- Mean velocity, P wave
- 6.0km/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: 5 measurements, root-mean-square deviation 0.42 s. S wave: 5 measurements, root-mean-square deviation 0.31 s.
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)5 stations | |||||
| KLBKalborn | 19.1 | 67 | 10:59:11.14+3.52 s | 10:59:14.27+6.65 s | 3.13 |
| VIAVianden | 26.5 | 114 | 10:59:11.49+3.87 s | 10:59:15.80+8.18 s | 4.31 |
| HOUHouvegnez | 37.1 | 16 | 10:59:14.08+6.46 s | 10:59:19.05+11.43 s | 4.97 |
| MRGMont Rigi | 55.3 | 16 | 10:59:17.01+9.39 s | 10:59:24.43+16.81 s | 7.42 |
| MEMHMembach | 64.9 | 9 | 10:59:19.12+11.50 s | 10:59:27.16+19.54 s | 8.04 |